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Restless legs syndrome is incurable – here’s how to manage the symptoms

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/adam-taylor-283950">Adam Taylor</a>, <a href="https://theconversation.com/institutions/lancaster-university-1176">Lancaster University</a></em></p> <p>Restless legs syndrome (RLS), also known as <a href="https://www.ninds.nih.gov/health-information/disorders/restless-legs-syndrome#toc-what-is-restless-legs-syndrome-rls-">Willis-Ekbom Disease</a>, is a neurological condition that affects <a href="https://pubmed.ncbi.nlm.nih.gov/38843039/">about 7%</a> of people.</p> <p>Typical symptoms include an irresistible urge to move your legs, alongside sensations of aching, crawling, creeping, itching, pulling or throbbing. Until the age of 35, the condition is <a href="https://cks.nice.org.uk/topics/restless-legs-syndrome/background-information/prevalence/">equally common</a> in men and women, but after that age, RLS affects <a href="https://www.racgp.org.au/getattachment/87576673-c695-48f6-a806-065da7e5fcc7/Restless-legs-syndrome.aspx">twice the number</a> of women than men.</p> <p>Each person’s condition is categorised as mild, moderate, severe or very severe according to the <a href="https://biolincc.nhlbi.nih.gov/media/studies/masm/IRLS.pdf?link_time=2019-07-07_21:09:19.282153">international rating scale</a>, which measures the effects of RLS on limb discomfort and sleep disruption, as well as frequency of symptoms.</p> <p>RLS symptoms have a 24-hour cycle known as a <a href="https://www.sciencedirect.com/science/article/pii/S0301008205001371">circadian rhythm</a>. Symptoms tend to peak at night, coinciding with the body’s <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/ana.10843">increase in melatonin release</a>. Melatonin reduces dopamine – the brain chemical that affects movement and mood – to help us sleep but, because dopamine helps control muscles, low dopamine levels can cause involuntary movements.</p> <p>There is <a href="https://cks.nice.org.uk/topics/restless-legs-syndrome/diagnosis/investigations/">no test for RLS</a>. Diagnosis is based on symptoms and medical history. Primary RLS runs in families – there are <a href="https://pubmed.ncbi.nlm.nih.gov/12764067/">genetic</a> links to a <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2653903/">number of chromosomes</a>. RLS has an autosomal dominant inheritance pattern, meaning you only need one “defective” copy to present with symptoms. Some cases, however, develop with no known cause.</p> <p>Other people may develop “secondary” RLS as a result of other conditions, such as <a href="https://pubmed.ncbi.nlm.nih.gov/34732752/">iron deficiency anaemia</a>, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6464953/">chronic kidney disease</a>, <a href="https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(22)00087-6/fulltext">diabetes</a>, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3900617/">Parkinson’s disease</a>, <a href="https://onlinelibrary.wiley.com/doi/10.1111/1756-185X.14710">rheumatoid arthritis</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/32483857/">underactive thyroid gland</a>, and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2952743/">fibromyalgia</a>. While primary RLS is more common than secondary, the latter is usually <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6073788/">more severe and progresses more rapidly</a>.</p> <figure><iframe src="https://www.youtube.com/embed/hnTKtp5PZGo?wmode=transparent&amp;start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> <h2>Risk factors</h2> <p>Age seems to be a risk factor for RLS. In 2000, <a href="https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/485413">a study found</a> that 10% of adults aged 30 to 79 have RLS, increasing to 19% of those over the age of 80. However, understanding of the condition has improved since that study was conducted, so it’s likely these figures are higher – particularly in children, where <a href="https://mecp.springeropen.com/articles/10.1186/s43045-022-00226-9">some RLS symptoms</a> have been confused with “growing pains” or ADHD in the past.</p> <p>Women have an increased chance of developing RLS. Approximately <a href="https://pubmed.ncbi.nlm.nih.gov/29169861/">one in five women</a> will suffer from restless legs at some point, and some studies suggest as many as <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5562408/">one in three women</a> are affected. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4478054/">Women are</a> <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9176156/">more likely</a> to suffer from <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4478054/">other comorbidities</a> that affect the central nervous system, such as <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10982394/">anxiety, depression</a> and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8634649/">migraine</a>, which may be linked to the development of RLS.</p> <p>Pregnancy is another risk factor. The further you are through the trimesters, the higher your chance of being affected BY RLS – with 8%, 16% and 22% of women suffering through their respective first, second and third trimesters. Multiple pregnancies increase the <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5562408/">risk of pregnancy-related RLS</a>, and research has found that women who’ve given birth may have a <a href="https://www.sciencedirect.com/science/article/pii/S1389945709001890">higher incidence of RLS</a> in later life, compared with women of the same age who haven’t given birth.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4751426/">Obesity</a> is also considered a risk factor for RLS. One study showed that each 5kg/m² increase in body mass index increased the likelihood of developing RLS <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2677487/">by 31%</a>.</p> <h2>Triggers and treatments</h2> <p>Research has shown smoking and alcohol consumption seem to <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.11390">make RLS worse</a>, so <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4751426/">lifestyle changes</a> such as stopping smoking and drinking alcohol can help manage symptoms.</p> <figure><iframe src="https://www.youtube.com/embed/x1hizeYdBFk?wmode=transparent&amp;start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> <p><a href="https://movementdisorders.onlinelibrary.wiley.com/doi/full/10.1002/mdc3.13833">Research has also found</a> that exercise and stretching is beneficial for symptom relief or reduction – although <a href="https://onlinelibrary.wiley.com/doi/10.1111/jsr.13980">study participants</a> suggest that morning exercise is more effective for improving symptoms, while evening exercise can make restless legs worse. Patients with secondary forms of RLS, lower BMI and less severe cases of the condition <a href="https://www.sciencedirect.com/science/article/pii/S1389945724005409">may benefit the most</a> from lifestyle changes to manage symptoms.</p> <p>Also, treatment of underlying issues can also alleviate or reduce some of the symptoms. For instance, iron deficiency anaemia <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5434142/">reduces</a> dopamine levels, which can lead to restless legs. Iron supplements <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.7810">may benefit</a> some sufferers – but <a href="https://academic.oup.com/sleep/article/47/7/zsae022/7585953">the evidence</a> is mixed so supplements won’t help everyone.</p> <p>In terms of medication, research has found that neurological therapies, such as the anticonvulsant Gabapentin – usually prescribed as a treatment for epilepsy – can improve <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2878254/">symptoms</a> and overall <a href="https://pubmed.ncbi.nlm.nih.gov/27067343/">quality of life</a> for those suffering with restless legs. <a href="https://pubmed.ncbi.nlm.nih.gov/26456872/">These therapies</a> target <a href="https://www.sciencedirect.com/science/article/abs/pii/B9780123745309000073">nerve cells</a> in the brain, <a href="https://www.sciencedirect.com/science/article/abs/pii/B9780123745309000073">reducing</a> <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3349794/">their activity</a>.</p> <p>Other medicines – known as dopamine agonists – <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3543080/">activate dopamine receptors in the brain</a> to control movement. They are primarily used as a <a href="https://www.parkinsons.org.uk/information-and-support/dopamine-agonists-pramipexole-ropinirole">treatment</a> for Parkinson’s disease and are effective in <a href="https://pubmed.ncbi.nlm.nih.gov/38761607/">managing</a> <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8908466/">symptoms</a> of RLS. However, they can disturb your sleep pattern and may <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5762774/">increase impulse control disorders</a>, and are not <a href="https://cks.nice.org.uk/topics/restless-legs-syndrome/management/management/">recommended during pregnancy</a> or breastfeeding as they can <a href="https://www.ncbi.nlm.nih.gov/books/NBK551686/">inhibit lactation</a>.</p> <p>While there may not be a cure for RLS, there is hope for sufferers – and options for managing and reducing symptoms.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/248169/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/adam-taylor-283950"><em>Adam Taylor</em></a><em>, Professor of Anatomy, <a href="https://theconversation.com/institutions/lancaster-university-1176">Lancaster University</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/restless-legs-syndrome-is-incurable-heres-how-to-manage-the-symptoms-248169">original article</a>.</em></p> </div>

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What is callisthenics? And how does it compare to running or lifting weights?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/mandy-hagstrom-1180806">Mandy Hagstrom</a>, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a> and <a href="https://theconversation.com/profiles/justin-keogh-129041">Justin Keogh</a>, <a href="https://theconversation.com/institutions/bond-university-863"><em>Bond University</em></a></em></p> <p>Callisthenics is a type of training where you do bodyweight exercises to build strength. It’s versatile, low cost, and easy to start.</p> <p>Classic callisthenics moves include:</p> <ul> <li>push ups</li> <li>bodyweight squats</li> <li>chin ups</li> <li>burpees</li> <li>lunges using only your bodyweight.</li> </ul> <p>Advanced callisthenics includes movements like <a href="https://www.google.com/search?q=muscle-ups&amp;rlz=1C5GCCM_en&amp;oq=muscle-ups&amp;gs_lcrp=EgZjaHJvbWUyCQgAEEUYORiABDIGCAEQABgeMgYIAhAAGB4yBggDEAAYHjIGCAQQABgeMgYIBRAAGB4yBggGEAAYHjIGCAcQABgeMgYICBAAGB4yBggJEAAYHtIBBzkzOWowajmoAgCwAgE&amp;sourceid=chrome&amp;ie=UTF-8#fpstate=ive&amp;vld=cid:e41f29e0,vid:1fQdBZfIuIY,st:0">muscle-ups</a> (where you pull yourself above a bar) and <a href="https://www.youtube.com/watch?v=OFgk7ysG2fY">flagpole holds</a> (where you hold yourself perpendicular to a pole).</p> <p>In callisthenics, you often do a lot of repetitions (or “reps”) of these sorts of moves, which is what can make it a hybrid strength and cardio workout. In the gym, by contrast, many people take the approach of “<a href="https://theconversation.com/lift-heavy-or-smaller-weights-with-high-reps-it-all-depends-on-your-goal-190902">lifting heavy</a>” but doing fewer reps to build serious strength.</p> <p>Traditionally, callisthenics was more of a muscle sculpting, strength-based work out. It is reportedly based on techniques used by <a href="https://www.bbc.com/reel/video/p0757qbx/how-ancient-greeks-trained-for-war">ancient Greek</a> soldiers.</p> <p>The <a href="https://www.oed.com/dictionary/callisthenic_adj?tab=factsheet#10451225">Oxford Dictionary</a> says the term callisthenics – which is said to be based on the Greek word κάλλος or <em>kállos</em> (meaning beauty) and σθένος or <em>sthenos</em> (meaning strength) – first started showing up in popular discourse the early 1800s.</p> <p>Callisthenics is often associated with high intensity interval training (HIIT) routines, where jumping, skipping or burpees are combined with bodyweight strength-building exercises such as push ups and body weight squats (often for many reps).</p> <p>Callisthenics exercises draw on your natural movement; when children climb on monkey bars and jump between pieces of play equipment, they’re basically doing callisthenics.</p> <h2>What are the benefits of callisthenics?</h2> <p>It all depends on how you do callisthenics; what you put in will dictate what you get out.</p> <p>When exercise programs combine resistance training (such as lifting weights or doing bodyweight exercises) and aerobic exercise, the result is better health and a reduced likelihood of death <a href="https://academic.oup.com/eurjpc/article-abstract/26/15/1647/5925845#google_vignette">from a variety of different causes</a>.</p> <p>Callisthenics provide a low cost, time efficient way of exercising this way.</p> <p>With improvements in body composition, muscular strength, and <a href="https://content.iospress.com/articles/isokinetics-and-exercise-science/ies170001">posture</a>, it’s easy to see why it’s become a popular way to train.</p> <p>Research has also shown callisthenics is <a href="https://content.iospress.com/articles/physiotherapy-practice-and-research/ppr220688">better</a> at reducing body fat and controlling blood sugar for people with diabetes when compared to pilates.</p> <p>Research has also shown doing callisthenics can reduce body fat and increase lean muscle mass <a href="https://www.researchgate.net/profile/Ali-Erdem-Cigerci/publication/342339065_The_Effect_of_Calisthenics_Exercises_on_Body_Composition_in_Soccer_Players/links/5eee7aff299bf1faac68c131/The-Effect-of-Calisthenics-Exercises-on-Body-Composition-in-Soccer-Players.pdf">in soccer players</a>, although this research does not compare the benefits between different exercise program types.</p> <p>That means we don’t know if callisthenics is better than other traditional forms of exercise – just that it does more than nothing.</p> <h2>What are the potential drawbacks?</h2> <p>With callisthenics, it can be hard to progress past a certain point. If your goal is to get really big muscles, it may be hard to get there with callisthenics alone. It would likely be simpler for most people to <a href="https://theconversation.com/lift-heavy-or-smaller-weights-with-high-reps-it-all-depends-on-your-goal-190902">gain muscle in a gym</a> using traditional methods such as machine and free weights with a combination of various sets and reps.</p> <p>If you want to progress in the gym, you can increase your dumbbells by small increments, such as 1kg. In callisthenics, however, you may find the jump from one exercise to the next too big to achieve. You risk a plateau in your training without some challenging work-arounds.</p> <p>Another advantage of traditional strength training with bands, machines, or free weights is that it also increases flexibility and range of motion.</p> <p>However, 2023 <a href="https://link.springer.com/article/10.1007/s40279-022-01804-x">research</a> found “no significant range of motion improvement with resistance training using only body mass.” So, given its focus on bodyweight exercises, it seems unlikely callisthenics alone would significantly improve your flexibility and range of motion.</p> <p>Unfortunately, there is no long-term research examining the benefits of callisthenics in direct comparison to traditional aerobic training or resistance training.</p> <h2>Is callisthenics for me?</h2> <p>Well, that depends on your goal.</p> <p>If you want to get really strong, <a href="https://journals.lww.com/nsca-jscr/Fulltext/2017/12000/Strength_and_Hypertrophy_Adaptations_Between_Low_.31.aspx?casa_token=77cmEPgUQr0AAAAA:MchrZRbKBGLl5WCJbqYN5X06rkBHReifOetdXfzJiBg22P62ZnZl6m8OZKov8975QRAjTbYK0Gf2ivA62W0NiAA">lift heavy</a>.</p> <p>If you want to increase your <a href="https://www.ingentaconnect.com/content/wk/jsc/2022/00000036/00000002/art00012">muscle mass</a>, try lifting near to the point of “failure”. That means lifting a weight to the point where you feel that you are close to fatigue, or close to the point that you may need to stop. The key here is that you don’t have to get to the point of failure to achieve muscle growth – but you do have to put in sufficient effort.</p> <p>If you want to get lean, focus first on nutrition, and then understand that either <a href="https://onlinelibrary.wiley.com/doi/10.1111/obr.12536">cardio</a>, <a href="https://link.springer.com/article/10.1007/s40279-021-01562-2?fbclid=IwAR2NiI1tcKLIi0f0MLBlafT-hcHbObBvIrl6Sb5gBcSDImsmpEplSuJpRww">lifting</a> or both can help.</p> <p>What if you’re time poor, or don’t have a gym membership? Well, callisthenics exercises offer some of the cardio benefits of a run, and some of the muscular benefits of a lifting session, all tied up in one neat package.</p> <p>It can be a great holiday workout at a local park or playground, on public outdoor exercise equipment, or even on the deck of a holiday rental.</p> <p>But, as with all exercise, there are potential benefits and limitations of callisthenics.</p> <p>Callisthenics has its place, but, for most, it’s likely best used as just one part of a well-rounded training routine.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/246326/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/mandy-hagstrom-1180806"><em>Mandy Hagstrom</em></a><em>, Senior Lecturer, Exercise Physiology. School of Health Sciences, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a> and <a href="https://theconversation.com/profiles/justin-keogh-129041">Justin Keogh</a>, Associate Dean of Research, Faculty of Health Sciences and Medicine, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-is-callisthenics-and-how-does-it-compare-to-running-or-lifting-weights-246326">original article</a>.</em></p> </div>

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Should Australia mandate cancer warnings for alcoholic drinks?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/rachel-visontay-2291993">Rachel Visontay</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> and <a href="https://theconversation.com/profiles/louise-mewton-2292647">Louise Mewton</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a></em></p> <p>Alcohol causes huge harm in Australia, <a href="https://www.thelancet.com/article/S1470-2045(21)00279-5/fulltext">responsible for 5,800 new cancer cases per year</a>. Yet many of us remain in the dark about its health risks.</p> <p>In January, the United States’ Office of the Surgeon General, the country’s leading public health spokesperson, <a href="https://www.hhs.gov/surgeongeneral/priorities/alcohol-cancer/index.html">recommended warnings about alcohol’s cancer risks</a> should be displayed on drink packaging.</p> <p>These messages have already been made obligatory in <a href="https://www.thelancet.com/journals/lanepe/article/PIIS2666-7762(25)00001-8/fulltext#:%7E:text=In%20May%202026%2C%20Ireland%20will,warnings%20(following%20South%20Korea).">Ireland and South Korea</a>.</p> <p>So, do they work? And should we mandate them here?</p> <h2>Isn’t a glass of wine or two good for me?</h2> <p>Most of us know heavy drinking is unhealthy.</p> <p>Yet the belief a few glasses of wine helps protect against heart disease and other conditions has persisted. That is despite <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/acer.15299">evidence in recent years</a> showing the benefits have been overestimated and the harms underplayed.</p> <p>In fact, <a href="https://www.who.int/europe/news/item/06-11-2023-joint-statement-by-who-europe-and-iarc-to-the-european-parliament---raising-awareness-of-the-link-between-alcohol-and-cancer#:%7E:text=There%20is%20also%20clear%20evidence,for%20cancers%20can%20be%20established.">any level of alcohol</a> use increases the risk for several types of cancer, including colorectal cancer (affecting the large intestine and rectum) and breast cancer.</p> <p>In recent years, the <a href="https://www.ndph.ox.ac.uk/news/new-genetic-study-confirms-that-alcohol-is-a-direct-cause-of-cancer">evidence has strengthened showing alcohol</a> plays a clear, causal role increasing cancer risk and other serious health problems, as well as <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2802963">all-cause mortality</a>.</p> <p><a href="https://doi.org/10.1016/j.canep.2021.102049">One study estimated</a> how many new cancer cases will develop across the lifetimes of the 18.8 million Australian adults who were alive in 2016. It predicted a quarter of a million (249,700) new cancers – mostly colorectal – will arise due to alcohol.</p> <p>We know what causes this harm. For example, acetaldehyde – a chemical produced by the body when it processes alcohol – <a href="https://www.cancervic.org.au/cancer-information/preventing-cancer/limit-alcohol/how-alcohol-causes-cancer">is carcinogenic</a>.</p> <p>Alcohol also increases cancer risk through “<a href="https://my.clevelandclinic.org/health/articles/oxidative-stress">oxidative stress</a>”, an imbalance in the body’s antioxidants and free radicals which causes damage to DNA and inflammation.</p> <p>It can also affect <a href="https://www.cancervic.org.au/cancer-information/preventing-cancer/limit-alcohol/how-alcohol-causes-cancer">hormone levels</a>, which raises the risk for breast cancer in particular.</p> <h2>Australians unaware of the risk</h2> <p>While the harms are well-known to researchers, many Australians remain unaware.</p> <p>Figures vary, but <a href="https://www.cancercouncil.com.au/news/what-do-you-mean-alcohol-causes-cancer-nsw-communitys-views-on-alcohol-and-alcohol-policy-options/#:%7E:text=In%202022%2C%20we%20surveyed%20the,our%20last%20survey%20in%202019.">at best only 59% of us</a> know about the direct link between alcohol and cancer (and at worst, <a href="https://pubmed.ncbi.nlm.nih.gov/37247850/">just one in five</a> are aware).</p> <p>Perhaps the best evidence this message has failed to sink in is our continued love affair with alcohol.</p> <p>In 2022–23 <a href="https://www.aihw.gov.au/reports/alcohol/alcohol-tobacco-other-drugs-australia/contents/drug-types/alcohol">69% of us drank alcohol, with one in three</a> doing so at levels deemed risky by the National Health and Medical Research Council. For both men and women, that means <a href="https://www.nhmrc.gov.au/health-advice/alcohol">having more than ten standard drinks per week</a> or more than four in one day.</p> <h2>What are other countries doing?</h2> <p><a href="https://www.foodstandards.gov.au/business/labelling/pregnancy-warning-labels/pregnancy-warning-labels-downloadable-files#faqs">Like Australia</a>, the US already has warnings on alcohol about its impacts on unborn children and a person’s ability to operate cars and machinery.</p> <p>The US Surgeon General wants additional explicit warnings about cancer risk to be compulsory.</p> <p>This follows Ireland, <a href="https://www.wcrf.org/about-us/news-and-blogs/how-ireland-beat-the-odds-to-introduce-cancer-warning-labels-on-alcohol/">the first country</a> to mandate cancer labels for alcohol. From 2026, alcohol packaging will include the warning: “there is a direct link between alcohol and fatal cancers”.</p> <p>Other countries, including Norway and Thailand, are also <a href="https://www.nytimes.com/2025/01/03/world/alcohol-cancer-warnings-countries.html">reportedly investigating cancer warning labels</a>.</p> <p>Since 2017, alcohol producers in South Korea have had to choose between three compulsory warning labels – <a href="https://iard.org/science-resources/detail/Health-Warning-Labeling-Requirements">two of which warn of cancer risks</a>. However they can instead opt for a label which warns about alcohol’s risks for <a href="https://journals.lww.com/co-psychiatry/abstract/2021/03000/alcohol_use_and_dementia__new_research_directions.15.aspx">dementia</a>, <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)31772-0/fulltext?previewDate=09-01-2015+00%3A00+Europe%2FHelsinki%3Fcategory%3Dterveys%2Fapi%2Ffragment%2Fhtml">stroke</a> and <a href="https://www.niaaa.nih.gov/publications/brochures-and-fact-sheets/interrupted-memories-alcohol-induced-blackouts#:%7E:text=Alcohol-related%20blackouts%20are%20gaps,brain%20area%20called%20the%20hippocampus.">memory loss</a>.</p> <h2>Will Australia follow suit?</h2> <p><a href="https://www.cancer.org.au/about-us/policy-and-advocacy/prevention/alcohol">Australian health bodies have been advocating</a> for cancer warnings on drink packaging for <a href="https://fare.org.au/alcohol-product-labelling-health-warning-labels-and-consumer-information/">over a decade</a>.</p> <p>Currently, whether to include warnings about alcohol’s general health risks is at the discretion of the manufacturer.</p> <p>Many use vague “drink responsibly” messages or templates provided by DrinkWise, an organisation <a href="https://drinkwise.org.au/about-us/#:%7E:text=DrinkWise%20is%20funded%20primarily%20through,financial%20and%20in%2Dkind%20support.">funded by the alcohol industry</a>.</p> <p>Pregnancy <a href="https://www.foodstandards.gov.au/business/labelling/pregnancy-warning-labels">warning labels</a> (“Alcohol can cause lifelong harm to your baby”) only became obligatory in 2023. Although this covers just one of alcohol’s established health effects, it has set an important precedent.</p> <p>We now have a template for how introducing cancer and other health warnings might work.</p> <p>With pregnancy labels, the government <a href="https://www.transparency.gov.au/publications/health/food-standards-australia-new-zealand/food-standards-australia-new-zealand-annual-report-2018-19/4.-highlights/pregnancy-warnings-on-alcohol">consulted public health and industry bodies</a> and gave a <a href="https://www.foodstandards.gov.au/business/labelling/pregnancy-warning-labels">three-year transition period</a> for manufacturers to adjust. We even have examples of colour and formatting of required labels that could be adapted.</p> <p>Perhaps most promisingly, <a href="https://www.cancercouncil.com.au/news/what-do-you-mean-alcohol-causes-cancer-nsw-communitys-views-on-alcohol-and-alcohol-policy-options/#:%7E:text=In%202022%2C%20we%20surveyed%20the,our%20last%20survey%20in%202019.">four in five surveyed Australians support</a> adding these cancer-specific warnings.</p> <h2>Would it work?</h2> <p>We know the existing “drink responsibly”-style warnings are not enough. Research shows consumers find these messages <a href="https://www.tandfonline.com/doi/full/10.1080/16066359.2021.1884229">ambiguous</a>.</p> <p>But would warnings about cancer be an improvement? Ireland’s rules are yet to come into effect, and it’s too early to tell how well South Korea’s policy has worked (there are also limitations give manufacturers can choose a warning not related to cancer).</p> <p>But <a href="https://pubmed.ncbi.nlm.nih.gov/32359056/">a trial</a> of cancer warnings in one Canadian liquor store found they increased knowledge of the alcohol–cancer link by 10% among store customers.</p> <p>Cancer messages would likely increase awareness about risks. But more than that – a 2016 <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4883036/#:%7E:text=The%20results%20of%20the%20present,and%20changes%20in%20drinking%20intentions.">study that tested cancer warnings</a> on a group of 1,680 adults across Australia found they were also effective at reducing people’s intentions to drink.</p> <p>The evidence suggests a similar policy could replicate <a href="https://tobaccocontrol.bmj.com/content/20/5/327">the success of cancer warnings on cigarette packaging</a> – first introduced in the 1970s – at increasing knowledge about risks and reducing consumption. Smoking rates in Australian adults <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4392189/">have declined steadily since these warnings were first introduced</a>.</p> <p>It may take years before Australia changes its rules on alcohol labelling.</p> <p>In the meantime, it’s important to familiarise yourself with the current national <a href="https://www.nhmrc.gov.au/health-advice/alcohol">low-risk drinking guidelines</a>, which aim to minimise harm from alcohol across a range of health conditions.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/246890/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/rachel-visontay-2291993"><em>Rachel Visontay</em></a><em>, Postdoctoral Research Fellow in Alcohol and Long-term Health, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> and <a href="https://theconversation.com/profiles/louise-mewton-2292647">Louise Mewton</a>, Associate Professor, Matilda Centre for Research in Mental Health and Substance Use, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/should-australia-mandate-cancer-warnings-for-alcoholic-drinks-246890">original article</a>.</em></p> </div>

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Around 3% of us will develop a brain aneurysm in our lives. So what is it and how do you treat it?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/theresa-larkin-952095">Theresa Larkin</a>, <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a> and <a href="https://theconversation.com/profiles/jessica-nealon-1481995">Jessica Nealon</a>, <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a></em></p> <p>Australian radio host Kyle Sandilands announced on air that he <a href="https://www.abc.net.au/news/2025-02-03/kyle-sandilands-brain-aneurysm-diagnosis/104888826">has a brain aneurysm</a> and needs urgent brain surgery.</p> <p>Typically an aneurysm occurs when a part of the wall of an artery (a type of blood vessel) becomes stretched and bulges out.</p> <p>You can get an aneurysm <a href="https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/aneurysm">in any blood vessel</a>, but they are most common in the brain’s arteries and the aorta, the large artery that leaves the heart.</p> <p>Many people can have a brain aneurysm and never know. But a brain (or aortic) aneurysm that ruptures and bursts can be fatal.</p> <p>So, what causes a brain aneurysm? And what’s the risk of rupture?</p> <h2>Weakness in the artery wall</h2> <p>Our arteries need strong walls because blood is constantly pumped through them and pushed against the walls.</p> <p>An <a href="https://www.healthdirect.gov.au/aneurysms">aneurysm</a> can develop if there is a weak part of an artery wall.</p> <p>The walls of arteries are made of three layers: an inner lining of cells, a middle layer of muscle and elastic fibres, and a tough outer layer of mostly collagen (a type of protein). Damage to any of these layers causes the wall to become thin and stretched. It can then balloon outward, leading to an aneurysm.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4399795/">Genetics</a> and <a href="https://www.ninds.nih.gov/health-information/disorders/cerebral-aneurysms">certain inherited disorders</a> can cause weak artery walls and brain aneurysms in some people.</p> <p>For all of us, our artery walls become weaker as we age, and brain aneurysms are more common as we get older. The <a href="https://www.ncbi.nlm.nih.gov/books/NBK557867/">average age for a brain aneurysm</a> to be detected is 50 (Sandilands is 53).</p> <p>Females have a higher risk of brain aneurysm than males <a href="https://www.ncbi.nlm.nih.gov/books/NBK507902/">after about age 50</a>. Declining oestrogen around menopause reduces the collagen in the artery wall, causing it to become weaker.</p> <figure class="align-center "><img src="https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=400&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=400&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=400&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=503&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=503&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/646696/original/file-20250204-15-i55mtq.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=503&amp;fit=crop&amp;dpr=3 2262w" alt="An illustration showing a brain aneurysm." /><figcaption><span class="caption">A brain aneurysm occurs when a part of the wall of an artery balloons out.</span> <span class="attribution"><a class="source" href="https://www.shutterstock.com/image-vector/human-brain-blocking-stroke-aneurysm-disease-2171173339">Alfmaler/Shutterstock</a></span></figcaption></figure> <p>High blood pressure can increase the risk of a brain aneurysm. In someone with high blood pressure, blood inside the arteries is pushed against the walls with greater force. This can <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3163429/">stretch and weaken the artery walls</a>.</p> <p>Another <a href="https://www.aihw.gov.au/reports/heart-stroke-vascular-diseases/hsvd-facts/contents/introduction">common condition</a> called atherosclerosis can also <a href="https://www.ninds.nih.gov/health-information/disorders/cerebral-arteriosclerosis">cause brain aneurysms</a>. In atherosclerosis, plaques made mostly of fat build up in arteries and stick to the artery walls. This directly damages the cell lining, and weakens the muscle and elastic fibres in the middle layer of the artery wall.</p> <h2>Several lifestyle factors increase risk</h2> <p>Anything that increases inflammation or causes atherosclerosis or high blood pressure in turn increases your risk of a brain aneurysm.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6527044/">Smoking and heavy drinking</a> affect all of these, and nicotine <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6214667/">directly damages</a> the artery wall.</p> <p>Sandilands mentioned <a href="https://www.news.com.au/entertainment/tv/radio/kyle-sandilands-reveals-shock-health-diagnosis-i-may-be-dead/news-story/62f9f05c6f0a03702632ec8d622cf97a">his cocaine use</a> in discussing his diagnosis. He said: "The facts are, a life of cocaine abuse and partying are not the way to go."</p> <p>Indeed, cocaine abuse <a href="https://www.nhs.uk/conditions/brain-aneurysm/causes/">increases the risk of a brain aneurysm</a>. It causes very high blood pressure because it causes arteries to spasm and constrict. Cocaine use is also <a href="https://www.sciencedirect.com/science/article/abs/pii/S1878875023017400">linked to worse outcomes</a> if a brain aneurysm ruptures.</p> <p><a href="https://onlinelibrary.wiley.com/doi/full/10.1111/ejn.15992">Stress</a> and a <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6243058/#:%7E:text=High%2Dfat%20diets%20(HFDs),many%20organs%20(see%20text).">high-fat diet</a> also increase inflammation. <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/atherosclerosis#:%7E:text=Atherosclerosis%20is%20thickening%20or%20hardening,activity%2C%20and%20eating%20saturated%20fats.">High cholesterol</a> can also cause atherosclerosis. And <a href="https://www.aihw.gov.au/reports/heart-stroke-vascular-diseases/hsvd-facts/contents/risk-factors/overweight-and-obesity">being overweight</a> increases your blood pressure.</p> <p><a href="https://www.ahajournals.org/doi/10.1161/JAHA.121.022277">A study</a> of more than 60,000 people found smoking and high blood pressure were the strongest risk factors for a brain aneurysm.</p> <h2>Is it always a medical emergency?</h2> <p>About <a href="https://www.ncbi.nlm.nih.gov/books/NBK557867/">three in 100 people</a> will have a brain aneurysm, varying in size from <a href="https://www.ncbi.nlm.nih.gov/books/NBK557867/">less than 5mm to more than 25mm</a> in diameter. The majority are only discovered while undergoing imaging for something else (for example, head trauma), because small aneurysms may not cause any symptoms.</p> <p>Larger aneurysms can cause symptoms because they can <a href="https://www.mayoclinic.org/diseases-conditions/brain-aneurysm/symptoms-causes/syc-20361483">press against brain tissues and nerves</a>.</p> <p>Sandilands described “<a href="https://www.abc.net.au/news/2025-02-03/kyle-sandilands-brain-aneurysm-diagnosis/104888826">a lot of headache problems</a>” leading up to his diagnosis. Headaches can be due to <a href="https://www.mayoclinic.org/diseases-conditions/brain-aneurysm/symptoms-causes/syc-20361483">minor leaks of blood</a> from the aneurysm. They indicate a risk of the aneurysm rupturing in subsequent days or weeks.</p> <p>Less than <a href="https://www.nature.com/articles/s41467-024-46015-2">one in 100 brain aneurysms will rupture</a>, often called a “brain bleed”. This causes a <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/subarachnoid-hemorrhage#:%7E:text=A%20subarachnoid%20hemorrhage%20is%20bleeding,brain%20and%20inside%20the%20skull.">subarachnoid haemorrhage</a>, which is a <a href="https://www.nhs.uk/conditions/subarachnoid-haemorrhage/">type of stroke</a>.</p> <p>If it does occur, rupture of a brain aneurysm is <a href="https://www.ncbi.nlm.nih.gov/books/NBK507902/">life-threatening</a>: nearly one in four people will die within 24 hours, and one in two within three months.</p> <p>If someone’s brain aneurysm ruptures, they usually experience a sudden, severe headache, often described as a “<a href="https://www.bafound.org/blog/three-signs-your-bad-headache-might-be-a-ruptured-brain-aneurysm/">thunderclap headache</a>”. They may also have <a href="https://www.ninds.nih.gov/health-information/disorders/cerebral-aneurysms">other symptoms of a stroke</a> such as changes in vision, loss of movement, nausea, vomiting and loss of consciousness.</p> <h2>Surgery can prevent a rupture</h2> <p>Whether surgery will be used to treat a brain aneurysm depends on its size and location, as well as the age and health of the patient. The medical team will balance the potential benefits with the risks of the surgery.</p> <p>A small aneurysm with low risk of rupture will usually <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2323531/">just be monitored</a>.</p> <p>However, once a brain aneurysm reaches <a href="https://www.ncbi.nlm.nih.gov/books/NBK507902/">7mm or more</a>, surgery is generally needed.</p> <p>In <a href="https://www.nhs.uk/conditions/brain-aneurysm/treatment/#:%7E:text=A%20cut%20is%20made%20in,permanently%20clamped%20on%20the%20aneurysm.">surgery to repair a brain aneurysm</a>, the surgeon will temporarily remove a small part of the skull, then cut through the coverings of the brain to place a tiny metal clip to close off the bulging part of the aneurysm.</p> <p>Another option is <a href="https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/endovascular-coiling">endovascular</a> (meaning within the vessel) coiling. A surgeon can pass a catheter into the femoral artery in the thigh, through the aorta to the brain. They can then place a coil inside the aneurysm which forms a clot to close off the aneurysm sac.</p> <p><a href="https://medlineplus.gov/ency/article/007372.htm">After either surgery</a>, usually the person will stay in hospital for up to a week. It can take <a href="https://www.healthline.com/health/brain-aneurysm-clipping-surgery#recovery">6–8 weeks</a> for full recovery, though doctors may continue monitoring with annual imaging tests for a few years afterwards.</p> <p>You can <a href="https://www.medicalnewstoday.com/articles/how-to-prevent-a-brain-aneurysm#prevention">lower your risk of a brain aneurysm</a> by not smoking, moderating alcohol intake, eating a healthy diet, exercising regularly and maintaining a healthy weight.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/248882/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/theresa-larkin-952095">Theresa Larkin</a>, Associate Professor of Medical Sciences, <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a> and <a href="https://theconversation.com/profiles/jessica-nealon-1481995">Jessica Nealon</a>, Senior Lecturer in Medical Sciences (Neuroscience), <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/around-3-of-us-will-develop-a-brain-aneurysm-in-our-lives-so-what-is-it-and-how-do-you-treat-it-248882">original article</a>.</em></p> </div>

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Can you get sunburnt or UV skin damage through car or home windows?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/theresa-larkin-952095">Theresa Larkin</a>, <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a></em></p> <p>When you’re in a car, train or bus, do you choose a seat to avoid being in the sun or do you like the sunny side?</p> <p>You can definitely feel the sun’s heat through a window. But can you get sunburn or skin damage when in your car or inside with the windows closed?</p> <p>Let’s look at how much UV (ultraviolet) radiation passes through different types of glass, how tinting can help block UV, and whether we need sunscreen when driving or indoors.</p> <h2>What’s the difference between UVA and UVB?</h2> <p>Of the <a href="https://www.who.int/news-room/questions-and-answers/item/radiation-ultraviolet-(uv)#:%7E:text=Most%20solar%20UVB%20is%20filtered,for%20the%20immediate%20tanning%20effect.">total UV</a> radiation that reaches Earth, about 95% is UVA and 5% is UVB.</p> <p>UVB only reaches the <a href="https://theconversation.com/curious-kids-why-dont-burns-bleed-130792">upper layers</a> of our skin but <a href="https://theconversation.com/what-is-the-uv-index-an-expert-explains-what-it-means-and-how-its-calculated-173146">is the major cause</a> of sunburn, cataracts and skin cancer.</p> <p>UVA <a href="https://theconversation.com/sunscreen-why-wearing-it-even-in-winter-could-be-a-good-idea-219640">penetrates deeper</a> into our skin and causes cell damage that leads to skin cancer.</p> <figure class="align-center "><img src="https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=416&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=416&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=416&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=523&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=523&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/646357/original/file-20250203-17-c897dp.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=523&amp;fit=crop&amp;dpr=3 2262w" alt="Graphic showing UVA and UVB penetrating skin" /><figcaption><span class="caption">UVA penetrates deeper than UVB.</span> <span class="attribution"><a class="source" href="https://www.shutterstock.com/image-vector/difference-radiation-types-sunlight-which-harmful-669925423">Shutterstock/solar22</a></span></figcaption></figure> <h2>Glass blocks UVA and UVB radiation differently</h2> <p>All <a href="https://onlinelibrary.wiley.com/doi/10.1111/phpp.12022">glass</a> used in house, office and car windows completely blocks UVB from passing through.</p> <p>But only laminated glass can completely block UVA. UVA <a href="https://www.skincancer.org/blog/sneaky-ways-youre-being-exposed-to-the-suns-uv-rays/#:%7E:text=UVB%20rays%2C%20the%20primary%20sunburn,the%20rays%20will%20reach%20you">can pass through</a> other glass used in car, house and office windows and <a href="https://theconversation.com/sunscreen-why-wearing-it-even-in-winter-could-be-a-good-idea-219640">cause skin damage</a>, increasing the risk of cancer.</p> <h2>Car windscreens block UVA, but the side and rear windows don’t</h2> <p>A car’s front windscreen lets in lots of sunshine and light. Luckily it <a href="https://onlinelibrary.wiley.com/doi/10.1111/phpp.12022">blocks 98% of UVA radiation</a> because it is made of two layers of laminated glass.</p> <p>But the side and rear car windows are made of tempered glass, which doesn’t completely block UVA. A <a href="https://jamanetwork.com/journals/jamaophthalmology/fullarticle/2522190">study of 29 cars</a> found a range from 4% to almost 56% of UVA passed through the side and rear windows.</p> <p>The UVA protection was not related to the car’s age or cost, but to <a href="https://www.sciencedirect.com/science/article/pii/S0190962205046244?casa_token=qxVQnQ_mFjEAAAAA:5n6QVYBb22gfsWNLxfxbNtsibJ1JXl_C7RtRhsaQLFVkRocFgoWiI4BnNyMGO35EnyIsLNhFK90">the type</a> of glass, its colour and whether it has been tinted or coated in a protective film. Grey or bronze coloured glass, and window tinting, all increase UVA protection. <a href="https://academic.oup.com/tropej/article/59/6/496/1660803">Window tinting</a> blocks around 95% of UVA radiation.</p> <p>In a separate study from Saudi Arabia, researchers fitted drivers with a <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9797294/">wearable radiation monitor</a>. They found drivers were exposed to UV index ratings up to 3.5. (In Australia, sun protection <a href="https://www.cancer.org.au/cancer-information/causes-and-prevention/sun-safety/about-sunscreen/spf50-sunscreen">is generally recommended</a> when the UV index is 3 or above – at this level it takes pale skin about 20 minutes to burn.)</p> <p>So if you have your windows tinted, you should not have to wear sunscreen in the car. But without tinted windows, you can accumulate skin damage.</p> <h2>UV exposure while driving increases skin cancer risk</h2> <p>Many people spend a lot of time in the car – for work, commuting, holiday travel and general transport. Repeated UVA radiation exposure through car side windows might go unnoticed, but it can affect our skin.</p> <p>Indeed, skin cancer is more common on the driver’s side of the body. A <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3117975/">study in the United States</a> (where drivers sit on the left side) found more skin cancers on the left than the right side for the face, scalp, arm and leg, including 20 times more for the arm.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/20226568/">Another US study</a> found this effect was higher in men. For <a href="https://www.cancerresearchuk.org/about-cancer/melanoma/stages-types/melanoma-in-situ-stage-0#:%7E:text=What%20is%20melanoma%20in%20situ,grown%20deeper%20into%20the%20skin.">melanoma in situ</a>, an early form of melanoma, 74% of these cancers were on the on the left versus 26% on the right.</p> <p>Earlier Australian studies reported more <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC1340770/">skin damage</a> and more <a href="https://jamanetwork.com/journals/jamadermatology/fullarticle/555250">skin cancer</a> on the right side.</p> <p>Cataracts and other eye damage are also <a href="https://www.aoa.org/news/clinical-eye-care/diseases-and-conditions/cataracts-and-uv-exposure-in-driver-side-windows?sso=y">more common on the driver’s side</a> of the body.</p> <h2>What about UV exposure through home or office windows?</h2> <p>We see UV damage from sunlight through our home windows in faded materials, furniture or plastics.</p> <p>Most glass used in residential windows lets a lot of UVA pass through, <a href="https://onlinelibrary.wiley.com/doi/10.1111/j.1600-0781.2009.00434.x">between 45 and 75%</a>.</p> <p>Single-pane glass lets through the most UVA, while thicker, tinted or coated glass blocks more UVA.</p> <p>The best options are laminated glass, or double-glazed, tinted windows that allow less than 1% of UVA through.</p> <p><a href="https://onlinelibrary.wiley.com/doi/10.1111/phpp.12022">Skylights</a> are made from laminated glass, which completely stops UVA from passing through.</p> <p>Most office and commercial window glass has better UVA protection than residential windows, allowing <a href="https://www.sciencedirect.com/science/article/pii/S0190962205046244?casa_token=qxVQnQ_mFjEAAAAA:5n6QVYBb22gfsWNLxfxbNtsibJ1JXl_C7RtRhsaQLFVkRocFgoWiI4BnNyMGO35EnyIsLNhFK90#bib17">less than 25% of UVA transmission</a>. These windows are usually double-glazed and tinted, with reflective properties or UV-absorbent chemicals.</p> <p>Some <a href="https://theconversation.com/smart-windows-could-be-the-next-big-thing-in-renewable-heating-245053">smart windows</a> that reduce heat using chemical treatments to darken the glass can also block UVA.</p> <h2>So when should you wear sunscreen and sunglasses?</h2> <p>The biggest risk with skin damage while driving is having the windows down or your arm out the window in direct sun. Even untinted windows will reduce UVA exposure to some extent, so it’s better to have the <a href="https://theconversation.com/i-cant-get-sunburnt-through-glass-shade-or-in-water-right-5-common-sunburn-myths-busted-150640">car window up</a>.</p> <p>For home windows, <a href="https://onlinelibrary.wiley.com/doi/10.1111/phpp.12022">window films or tint</a> can increase UVA protection of single pane glass. UVA blocking by glass is similar to protection by sunscreen.</p> <p>When you need to use sunscreen <a href="https://onlinelibrary.wiley.com/doi/pdf/10.5694/j.1326-5377.2006.tb00267.x">depends on</a> your skin type, latitude and time of the year. In a car without tinted windows, you could burn after one hour in the middle of the day in summer, and two hours in the middle of a winter’s day.</p> <p>But in the middle of the day next to a home window that allows more UVA to pass through, it <a href="https://onlinelibrary.wiley.com/doi/pdf/10.5694/j.1326-5377.2006.tb00267.x">could</a> take only 30 minutes to burn in summer and one hour in winter.</p> <p>When the UV index is above three, it is recommended you <a href="https://theconversation.com/sunglasses-dont-just-look-good-theyre-good-for-you-too-heres-how-to-choose-the-right-pair-245270">wear protective sunglasses</a> while driving or next to a sunny window to avoid eye damage.<!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/theresa-larkin-952095">Theresa Larkin</a>, Associate Professor of Medical Sciences, <a href="https://theconversation.com/institutions/university-of-wollongong-711">University of Wollongong</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/can-you-get-sunburnt-or-uv-skin-damage-through-car-or-home-windows-246599">original article</a>.</em></p> </div>

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Why the WHO has recommended switching to a healthier salt alternative

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/xiaoyue-luna-xu-1388807">Xiaoyue (Luna) Xu</a>, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a> and <a href="https://theconversation.com/profiles/bruce-neal-69">Bruce Neal</a>, <a href="https://theconversation.com/institutions/george-institute-for-global-health-874">George Institute for Global Health</a></em></p> <p>This week the <a href="https://www.who.int/news-room/events/detail/2025/01/27/default-calendar/launch-of-the-who-guideline-on-the-use-of-lower-sodium-salt-substitutes">World Health Organization</a> (WHO) released new guidelines recommending people switch the regular salt they use at home for substitutes containing less sodium.</p> <p>But what exactly are these salt alternatives? And why is the WHO recommending this? Let’s take a look.</p> <h2>A new solution to an old problem</h2> <p>Advice to eat less salt (sodium chloride) is not new. It has been part of international and Australian guidelines <a href="https://www.ahajournals.org/doi/full/10.1161/HYPERTENSIONAHA.123.21343?rfr_dat=cr_pub++0pubmed&amp;url_ver=Z39.88-2003&amp;rfr_id=ori%3Arid%3Acrossref.org">for decades</a>. This is because evidence clearly shows the sodium in salt can <a href="https://www.who.int/news-room/fact-sheets/detail/salt-reduction">harm our health</a> when we eat too much of it.</p> <p>Excess sodium increases the risk of high blood pressure, which affects millions of Australians (around <a href="https://www.aihw.gov.au/reports/risk-factors/high-blood-pressure/contents/summary">one in three adults</a>). High blood pressure (<a href="https://www.healthdirect.gov.au/high-blood-pressure-hypertension">hypertension</a>) in turn increases the risk of heart disease, stroke and kidney disease, among other conditions.</p> <p>The WHO estimates <a href="https://www.who.int/news-room/events/detail/2025/01/27/default-calendar/launch-of-the-who-guideline-on-the-use-of-lower-sodium-salt-substitutes">1.9 million deaths</a> globally each year can be attributed to eating too much salt.</p> <p>The WHO recommends consuming no more than <a href="https://www.who.int/news-room/fact-sheets/detail/salt-reduction">2g of sodium daily</a>. However people eat on average more than double this, around <a href="https://www.who.int/news-room/events/detail/2025/01/27/default-calendar/launch-of-the-who-guideline-on-the-use-of-lower-sodium-salt-substitutes">4.3g a day</a>.</p> <p>In 2013, WHO member states <a href="https://iris.who.int/bitstream/handle/10665/366393/9789240069985-eng.pdf?sequence=1">committed to reducing</a> population sodium intake <a href="https://www.who.int/news/item/09-03-2023-massive-efforts-needed-to-reduce-salt-intake-and-protect-lives">by 30% by 2025</a>. But cutting salt intake has proved very hard. Most countries, including Australia, will not meet the WHO’s goal for reducing sodium intake <a href="https://www.sciencedirect.com/science/article/pii/S2161831322004690?via%3Dihub_">by 2025</a>. The WHO has since <a href="https://www.who.int/news-room/events/detail/2025/01/27/default-calendar/launch-of-the-who-guideline-on-the-use-of-lower-sodium-salt-substitutes">set the same target for 2030</a>.</p> <p>The difficulty is that eating less salt means accepting a less salty taste. It also requires changes to established ways of preparing food. This has proved too much to ask of people making food at home, and too much for the food industry.</p> <h2>Enter potassium-enriched salt</h2> <p>The main lower-sodium salt substitute is called potassium-enriched salt. This is salt where some of the sodium chloride has been replaced with potassium chloride.</p> <p>Potassium is an <a href="https://www.healthdirect.gov.au/potassium">essential mineral</a>, playing a key role in all the body’s functions. The high potassium content of fresh fruit and vegetables is one of the main reasons they’re so good for you. While people are eating more sodium than they should, many don’t get enough potassium.</p> <p>The WHO recommends a daily potassium intake of 3.5g, but on the whole, people in most countries consume significantly <a href="https://www.ahajournals.org/doi/full/10.1161/HYPERTENSIONAHA.123.21343?rfr_dat=cr_pub++0pubmed&amp;url_ver=Z39.88-2003&amp;rfr_id=ori%3Arid%3Acrossref.org">less than this</a>.</p> <p>Potassium-enriched salt benefits our health by cutting the amount of sodium we consume, and increasing the amount of potassium in our diets. Both help to <a href="https://theconversation.com/this-salt-alternative-could-help-reduce-blood-pressure-so-why-are-so-few-people-using-it-221409">lower blood pressure</a>.</p> <p>Switching regular salt for potassium-enriched salt has been shown to <a href="https://heart.bmj.com/content/108/20/1608">reduce the risk</a> of heart disease, stroke and premature death in large trials around the world.</p> <p>Modelling studies have projected that population-wide switches to potassium-enriched salt use would prevent hundreds of thousands of deaths from cardiovascular disease (such as heart attack and stroke) each year in <a href="https://www.bmj.com/content/369/bmj.m824.long">China</a> and <a href="https://www.ahajournals.org/doi/10.1161/HYPERTENSIONAHA.122.19072?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub%20%200pubme">India</a> alone.</p> <p>The key advantage of switching rather than cutting salt intake is that potassium-enriched salt can be used as a direct one-for-one swap for regular salt. It looks the same, works for seasoning and in recipes, and most people don’t notice any important <a href="https://theconversation.com/this-salt-alternative-could-help-reduce-blood-pressure-so-why-are-so-few-people-using-it-221409">difference in taste</a>.</p> <p>In the <a href="https://www.nejm.org/doi/full/10.1056/NEJMoa2105675">largest trial</a> of potassium-enriched salt to date, more than 90% of people were still using the product after five years.</p> <h2>Making the switch: some challenges</h2> <p>If fully implemented, this could be one of the most consequential pieces of advice the WHO has ever provided.</p> <p>Millions of strokes and heart attacks could be prevented worldwide each year with a simple switch to the way we prepare foods. But there are some obstacles to overcome before we get to this point.</p> <p>First, it will be important to balance the benefits and the risks. For example, people with <a href="https://www.ahajournals.org/doi/full/10.1161/HYPERTENSIONAHA.123.21343?rfr_dat=cr_pub++0pubmed&amp;url_ver=Z39.88-2003&amp;rfr_id=ori%3Arid%3Acrossref.org">advanced kidney disease</a> don’t handle potassium well and so these products are not suitable for them. This is only <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8177747/">a small proportion</a> of the population, but we need to ensure potassium-enriched salt products are labelled with appropriate warnings.</p> <p>A key challenge will be making potassium-enriched salt more affordable and accessible. Potassium chloride is more expensive to produce than sodium chloride, and at present, potassium-enriched salt is mostly sold as a niche health product at a <a href="https://publichealth.jmir.org/2021/7/e27423">premium price</a>.</p> <p>If you’re looking for it, <a href="https://www.georgeinstitute.org/switchthesalt#card-with-text-2166">salt substitutes</a> may also be called low-sodium salt, potassium salt, heart salt, mineral salt, or sodium-reduced salt.</p> <p>A <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8319774/">review published in 2021</a> found low sodium salts were marketed in only 47 countries, mostly high-income ones. Prices ranged from the same as regular salt to almost 15 times higher.</p> <p>An expanded supply chain that produces much more food-grade potassium chloride will be needed to enable wider availability of the product. And we’ll need to see potassium-enriched salt on the shelves next to regular salt so it’s easy for people to find.</p> <p>In countries like Australia, about 80% of the salt we eat comes from <a href="https://www.foodstandards.gov.au/consumer/nutrition/sodium-salt/salthowmuch">processed foods</a>. The WHO guideline falls short by not explicitly prioritising a switch for the salt used in food manufacturing.</p> <p>Stakeholders working with government to encourage food industry uptake will be essential for maximising the health benefits.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/248436/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/xiaoyue-luna-xu-1388807">Xiaoyue (Luna) Xu</a>, Scientia Lecturer, School of Population Health, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a> and <a href="https://theconversation.com/profiles/bruce-neal-69">Bruce Neal</a>, Executive Director, George Institute Australia, <a href="https://theconversation.com/institutions/george-institute-for-global-health-874">George Institute for Global Health</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/why-the-who-has-recommended-switching-to-a-healthier-salt-alternative-248436">original article</a>.</em></p> </div>

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Vitamin B6 is essential – but too much can be toxic. Here’s what to know to stay safe

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/vasso-apostolopoulos-105605">Vasso Apostolopoulos</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a> and <a href="https://theconversation.com/profiles/jack-feehan-1239419">Jack Feehan</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a></em></p> <p>In recent weeks, <a href="https://www.abc.net.au/news/2025-01-08/vitamin-b6-toxicity-peripheral-neuropathy-health-supplements/104793006">reports have been circulating</a> about severe reactions in people who’ve taken over-the-counter vitamin B6 supplements.</p> <p>Vitamin B6 poisoning can injure nerves and lead to symptoms including numbness, tingling and even trouble walking and moving.</p> <p>In some cases, those affected <a href="https://www.abc.net.au/news/2025-01-28/vitamin-b6-toxicity-cases-rise-vitamins-supplements-tga-review/104863232">didn’t know the product contained</a> any vitamin B6.</p> <p>So what is vitamin B6, where is it found and how much is too much? Here’s what you need to know about this essential nutrient.</p> <h2>What is vitamin B6?</h2> <p>Vitamin B6 (also known as pyridoxine) is a group of six compounds that share a similar chemical structure.</p> <p>It is an essential nutrient, meaning we need it for normal body functions, but we can’t produce it ourselves.</p> <p><a href="https://www.eatforhealth.gov.au/nutrient-reference-values/nutrients/vitamin-b6">Adults aged 19–50</a> need 1.3mg of vitamin B6 per day. The recommended dose is lower for teens and children, and higher for those aged 51 and over (1.7mg for men and 1.5mg for women) and people who are breastfeeding or pregnant (1.9mg).</p> <p>Most of us get <a href="https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-b/">this in our diet</a> – largely from animal products, including meat, dairy and eggs.</p> <p>The vitamin is also available in a range of different plant foods, including spinach, kale, bananas and potatoes, so deficiency is <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8150266/">rare</a>, even for vegetarians and vegans.</p> <p>The vitamin B6 we consume in the diet is inactive, meaning the body can’t use it. To activate B6, the liver transforms it into a compound called pyridoxal-5’-phosphate (PLP).</p> <p>In this form, vitamin B6 helps the body with more than 140 cellular functions, including building and breaking down proteins, producing red blood cells, regulating blood sugar and supporting brain function.</p> <p>Vitamin B6 is important for <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6071262/">overall health</a> and has also been associated with reduced <a href="https://pubmed.ncbi.nlm.nih.gov/28376200/">cancer</a> risk and <a href="https://www.sciencedirect.com/science/article/abs/pii/S0098299716300395">inflammation</a>.</p> <p>Despite being readily available in the diet, vitamin B6 is also widely included in various supplements, multivitamins and other products, such as Berocca and energy drinks.</p> <h2>Should we be worried about toxicity?</h2> <p>Vitamin B6 toxicity is extremely rare. It <a href="https://europepmc.org/article/nbk/nbk470579?crsi=6624972170&amp;cicada_org_src=healthwebmagazine.com&amp;cicada_org_mdm=direct&amp;client=bot">almost never occurs from dietary intake alone</a>, unless there is a genetic disorders or disease that stops nutrient absorption (such as coeliac disease).</p> <p>This is because all eight vitamins in the B group are water-soluble. If you consume more of the vitamin than your body needs, it can be excreted readily and harmlessly in your urine.</p> <p>However, in some rare cases, <a href="https://pubmed.ncbi.nlm.nih.gov/37447150/">excessive vitamin B6</a> accumulates in the blood, resulting in a condition called peripheral neuropathy. We’re still not sure why this occurs in some people but not others.</p> <p>Peripheral neuropathy <a href="https://my.clevelandclinic.org/health/diseases/14737-peripheral-neuropathy">occurs when the sensory nerves</a> – those outside our brain and spinal cord that send information to the central nervous system – are damaged and unable to function. This can be caused by a wide range of diseases (and is most well known in type 2 diabetes).</p> <p>The most common symptoms are numbness and tingling, though in some cases patients may experience difficulty with balance or walking.</p> <p>We don’t know exactly how excess vitamin B6 causes peripheral neuropathy, but it is thought to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8483950/">interfere with how the neurotransmitter GABA</a> sends signals to the sensory nerves.</p> <p>Vitamin B6 can cause permanent damage to nerves. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10343656/">Studies have shown</a> symptoms improved when the person stopped taking the supplement, although they didn’t completely resolve.</p> <h2>What is considered excessive? And has this changed?</h2> <p><a href="https://www.cureus.com/articles/199499-vitamin-b6-toxicity-secondary-to-daily-multivitamin-use-a-case-report#!/">Toxicity usually occurs</a> only when people take supplements with high doses of B6.</p> <p>Until 2022, only products with more than 50mg of vitamin B6 were required to display a warning about peripheral neuropathy. But the <a href="https://www.tga.gov.au/news/safety-updates/peripheral-neuropathy-supplementary-vitamin-b6-pyridoxine">Therapeutic Goods Administration lowered this</a> and now requires any product containing more than 10mg of vitamin B6 to carry a warning.</p> <p>The Therapeutic Goods Administration has also halved the daily upper limit of vitamin B6 a product can provide – from 200mg to 100mg.</p> <p>These changes followed a review by the administration, after receiving 32 reports of peripheral neuropathy in people taking supplements. Two thirds of these people were taking less than 50mg of vitamin B6.</p> <p>The <a href="https://www.tga.gov.au/news/safety-updates/peripheral-neuropathy-supplementary-vitamin-b6-pyridoxine#what-should-health-professionals-do">Therapeutic Goods Administration acknowledges</a> the risk varies between individuals and a lot is unknown. Its review could not identify a minimum dose, duration of use or patient risk factors.</p> <h2>But I thought B vitamins were good for me?</h2> <p>Too much of anything can cause problems.</p> <p>The updated guidelines are likely to significantly lower the risk of toxicity. They also make consumers more aware of which products contain B6, and the risks.</p> <p>The Therapeutic Goods Administration will continue to monitor evidence and revise guidelines if necessary.</p> <p>While vitamin B6 toxicity remains very rare, there are still many questions about why some people get peripheral neuropathy with lower dose supplements.</p> <p>It could be that some specific vitamin B compounds have a stronger effect, or some people may have genetic vulnerabilities or diseases which put them <a href="https://www.sciencedirect.com/science/article/pii/S2161831322004781">at higher risk</a>.</p> <h2>So what should I do?</h2> <p>Most people don’t need to actively seek vitamin B6 in supplements.</p> <p>However, many reports to the Therapeutic Goods Administration were of vitamin B6 being added to supplements labelled as magnesium or zinc – and some weren’t aware they were consuming it.</p> <p>It is important to always check the label if you are taking a new medicine or supplement, especially if it hasn’t been explicitly prescribed by a health-care professional.</p> <p>Be particularly cautious if you are taking multiple supplements. While one multivitamin is unlikely to cause an issue, adding a magnesium supplement for cramping, or a zinc supplement for cold and flu symptoms, may cause an excessive vitamin B6 dose over time, and increase your risk.</p> <p>Importantly, pay attention to symptoms that may indicate peripheral neuropathy, such as pins and needles, numbness, or pain in the feet or hands, if you do change or add a supplement.</p> <p>Most importantly, if you need advice, you should talk to your doctor, dietitian or pharmacist.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/248443/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/vasso-apostolopoulos-105605">Vasso Apostolopoulos</a>, Distinguished Professor, Professor of Immunology, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a> and <a href="https://theconversation.com/profiles/jack-feehan-1239419">Jack Feehan</a>, Vice Chancellors Senior Research Fellow in Immunology, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/vitamin-b6-is-essential-but-too-much-can-be-toxic-heres-what-to-know-to-stay-safe-248443">original article</a>.</em></p> </div>

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Tonsils can grow back after they’ve been removed – here’s which other body parts can regenerate

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/adam-taylor-283950">Adam Taylor</a>, <a href="https://theconversation.com/institutions/lancaster-university-1176">Lancaster University</a></em></p> <p>The human body is composed of over <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6085824/">37 trillion cells</a>, each with a limited lifespan. These cells are continuously replaced to maintain organ and system function. Yet over time, or as a result of damage, the number of functioning cells can decrease to a level that causes symptoms or even organ failure.</p> <p>Regeneration of organs and systems is a scientific holy grail that relies on <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9973391/">stem cells</a>, but due to their limited number and slow division rate, this isn’t a practical route to organ regeneration. It would take many years to repopulate all the cell types needed.</p> <p>However, some people see organs “reappear”, like <a href="https://edition.cnn.com/2025/01/02/health/tonsils-regrow-sore-throat/index.html">Katy Golden</a> who had her tonsils removed for a second time as an adult after they grew back over 40 years.</p> <p>One reason that tonsils may grow back is that one of the operations to remove them is a <a href="https://pubmed.ncbi.nlm.nih.gov/22431869/">partial tonsillectomy</a>. Only removing part of the tonsils leads to a quicker recovery and fewer complications, but around <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5639321/">6% of children may see regrowth</a>, which may require further surgery in later life.</p> <p>Most people associate organ regrowth and regeneration with the liver. As little as <a href="https://www.nih.gov/news-events/nih-research-matters/cells-maintain-repair-liver-identified">10% of the liver</a> can regrow into a fully functioning liver. This is also how partial liver transplants allow the <a href="https://bmcsurg.biomedcentral.com/articles/10.1186/s12893-019-0606-5">donor to “regrow”</a> a normal sized and fully functioning liver.</p> <p>One organ that has a surprising capacity to regenerate is the spleen and sometimes it can regenerate without people realising.</p> <p>The spleen is a high-risk organ for injury and is the <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4056798/">most commonly injured organ</a> in blunt abdominal trauma during traffic collisions, sporting injuries or trivial activities such as <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8551460/">bumping into furniture</a>.</p> <p>The spleen is at high risk because it has lots of blood vessels and hence lots of blood, but is only surrounded by a <a href="https://pubmed.ncbi.nlm.nih.gov/31623879/">thin capsule</a> that can tear in trauma, allowing blood to leak out. This can <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6783166/">result in death</a> if not treated promptly.</p> <p>What may also happen is small pieces of the spleen – sometimes just a few cells – can become free in the abdomen and go on to “grow” where they settle – termed <a href="https://ajronline.org/doi/10.2214/AJR.11.7896">splenosis</a>, going on to have <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4762861/">similar functional activity</a> to a mature, normally located spleen. This can be beneficial for those who have to have their spleen removed due to traumatic injury, with some reports suggesting regeneration in up to <a href="https://pubmed.ncbi.nlm.nih.gov/2603609/">66% of patients</a>.</p> <p>In the last few years, our lungs have also been shown to have regenerative capacity. It is well known that smoking and other pollutants <a href="https://www.ncbi.nlm.nih.gov/books/NBK53021/">destroy the alveoli</a> (tiny air sacs) where oxygen is passed to the blood. Stopping smoking has been shown to allow cells that have avoided damage from the cancer-causing chemicals in tobacco smoke to help <a href="https://www.nature.com/articles/s41586-020-1961-1">regenerate and repopulate</a> the lining of parts of the airways with healthy cells.</p> <p>Where a lung has been removed, the remaining lung has to adapt to support the tissues of the body and ensure enough oxygen gets to them. Studies have shown that the remaining lung <a href="https://pubmed.ncbi.nlm.nih.gov/22808959/">increases the number of alveoli</a> it has, rather than the remaining alveoli compensating by getting bigger to take up more oxygen.</p> <p>It isn’t just organs inside that regenerate. One organ that constantly does so on a humongous scale is the skin.</p> <p>As the largest organ, it has multiple barrier functions to keep things such as <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4529263/">water in</a> and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6283644/">germs out</a>. With a <a href="https://www.sciencedirect.com/science/article/abs/pii/S0378517322004057">surface area of almost 2m²</a>, the skin requires a significant amount of regeneration to replenish the 500,000,000 cells that are lost each day – that’s over <a href="https://pubmed.ncbi.nlm.nih.gov/15541634/">2g of skin cells per day</a>.</p> <h2>Tissue regeneration is much more common</h2> <p>One of the most active regenerative tissues is the endometrial lining of the uterus which is shed every 28 days as part of the menstrual cycle and goes through about <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10308170/">450 cycles</a> of this during a woman’s life.</p> <p>This layer varies between <a href="https://pubs.rsna.org/doi/10.1148/rg.2017170008">0.5 and 18mm in thickness</a> depending on the stage of the menstrual cycle, the <a href="https://journals.physiology.org/doi/full/10.1152/physrev.00031.2019">functional cells</a> that are lost along with the blood from vessels that support a fertilised egg if it implants.</p> <p>Men’s genitalia can also show regeneration. <a href="https://www.nhs.uk/contraception/methods-of-contraception/vasectomy-male-sterilisation/what-is-it/">Vasectomy</a>, which removes a piece of the tube (<a href="https://www.cancer.gov/publications/dictionaries/cancer-terms/def/vas-deferens">vas deferens</a>) connecting the testes to the openings in the urethra, is used to reduce the chance of pregnancy by preventing sperm moving from the testes out of the penis.</p> <p>However, the cut ends of the ducts have shown regenerative capacity and reconnected. Some sections, where <a href="https://jamanetwork.com/journals/jamasurgery/article-abstract/536907">up to 5cm</a> has been restricted or removed, have shown regeneration, even through <a href="https://bmcurol.biomedcentral.com/articles/10.1186/1471-2490-6-25">scar tissue</a>. This “recanalisation” can result in unexpected pregnancies.</p> <p>Bone is another tissue that can regenerate. If you’ve ever broken a bone, you’ll know that it repairs so that (eventually) you will regain function.</p> <p>This process of repairing the break takes six to eight weeks. But the process of regenerating the bone architecture and strength <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5365304/">continues for months and years</a> beyond this date.</p> <p>However, with <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6667184/">increasing age</a> and in <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5643776/">post-menopausal woman</a>, this process slows and the bone may not regenerate to its <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6667184/">previous strength</a> or <a href="https://pubmed.ncbi.nlm.nih.gov/15763602/">structure</a>.</p> <p>Where paired organs exist and one is lost, there is good evidence that the remaining organ can increase its functional ability to help the body cope with maintaining function. For example, when one kidney is removed, the remaining kidney <a href="https://www.kidneyregistry.com/for-donors/kidney-donation-blog/what-changes-after-kidney-donation/">enlarges</a> to handle the extra workload, filtering blood and eliminating waste efficiently.</p> <p>Although organ regeneration is rare, it does happen and typically takes years to manifest because organs are complex structures. Work continues to try to understand how scientists can develop this knowledge to help with the shortage of donor organs. Thankfully, tissue regeneration happens much more often than many people might suppose, and it is a much-needed part of staying alive.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/246653/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/adam-taylor-283950"><em>Adam Taylor</em></a><em>, Professor and Director of the Clinical Anatomy Learning Centre, <a href="https://theconversation.com/institutions/lancaster-university-1176">Lancaster University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/tonsils-can-grow-back-after-theyve-been-removed-heres-which-other-body-parts-can-regenerate-246653">original article</a>.</em></p> </div>

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What’s the difference between a food allergy and an intolerance?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/jennifer-koplin-13384">Jennifer Koplin</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/desalegn-markos-shifti-1530163">Desalegn Markos Shifti</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>At one time or another, you’ve probably come across someone who is lactose intolerant and might experience some unpleasant gut symptoms if they have dairy. Maybe it’s you – food intolerances are estimated to affect <a href="https://nutritionaustralia.org/fact-sheets/food-intolerances/#How-common-are-food-intolerance-reactions?">up to 25%</a> of Australians.</p> <p>Meanwhile, cow’s milk allergy is one of the most common food allergies in infants and young children, affecting around <a href="https://pubmed.ncbi.nlm.nih.gov/38992429/">one in 100</a> infants.</p> <p>But what’s the difference between food allergies and food intolerances? While they might seem alike, there are some fundamental differences between the two.</p> <h2>What is an allergy?</h2> <p>Australia has one of the <a href="https://theconversation.com/were-the-allergy-capital-of-the-world-but-we-dont-know-why-food-allergies-are-so-common-in-australian-children-228786">highest rates of food allergies</a> in the world. Food allergies can develop at any age but are more common in children, affecting more than <a href="https://pubmed.ncbi.nlm.nih.gov/38992429/">10% of one-year-olds</a> and <a href="https://pubmed.ncbi.nlm.nih.gov/38597846/">6% of children</a> at age ten.</p> <p>A food allergy happens when the body’s <a href="https://www.allergy.org.au/patients/immune-system">immune system</a> mistakenly reacts to certain foods as if they were dangerous. The <a href="https://pubmed.ncbi.nlm.nih.gov/24388012/">most common foods</a> that trigger allergies include eggs, peanuts and other nuts, milk, <a href="https://pubmed.ncbi.nlm.nih.gov/37375617/">shellfish</a>, fish, soy and wheat.</p> <p>Mild to moderate signs of food allergy include a swollen face, lips or eyes; hives or welts on your skin; or vomiting. A <a href="https://www.allergy.org.au/patients/fast-facts/food-allergy">severe allergic reaction</a> (called anaphylaxis) can cause trouble breathing, persistent dizziness or collapse.</p> <h2>What is an intolerance?</h2> <p>Food <a href="https://www.allergy.org.au/patients/food-other-adverse-reactions/food-intolerance">intolerances</a> (sometimes called non-allergic reactions) are also reactions to food, but they don’t involve your immune system.</p> <p>For example, lactose intolerance is a metabolic condition that happens when the body doesn’t produce enough lactase. This enzyme is needed to break down the lactose (a type of sugar) in dairy products.</p> <p>Food intolerances can also include reactions to natural chemicals in foods (<a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4604636/">such as salicylates</a>, found in some fruits, vegetables, herbs and spices) and problems with artificial preservatives or flavour enhancers.</p> <p>Symptoms of <a href="https://www.allergy.org.au/patients/food-other-adverse-reactions/food-intolerance">food intolerances</a> can include an upset stomach, headaches and fatigue, among others.</p> <p>Food intolerances don’t cause life-threatening reactions (anaphylaxis) so are less dangerous than allergies in the short term, although they can cause problems in the longer term <a href="https://www.foodauthority.nsw.gov.au/consumer/life-events-and-food/allergy-and-intolerance">such as malnutrition</a>.</p> <p>We don’t know a lot about how common food intolerances are, but they appear to be <a href="https://www.foodauthority.nsw.gov.au/consumer/life-events-and-food/allergy-and-intolerance">more commonly reported</a> than allergies. They can develop at any age.</p> <h2>It can be confusing</h2> <p>Some foods, such as <a href="https://pubmed.ncbi.nlm.nih.gov/33510829/">peanuts and tree nuts</a>, are more often associated with allergy. Other foods or ingredients, such as caffeine, are more often associated with intolerance.</p> <p>Meanwhile, certain foods, such as cow’s milk and wheat or gluten (a protein found in wheat, rye and barley), can cause both allergic and non-allergic reactions in different people. But these reactions, even when they’re caused by the same foods, are quite different.</p> <p>For example, children with a cow’s milk allergy can react to very small amounts of milk, and serious reactions (such as throat swelling or difficulty breathing) can happen within minutes. Conversely, many people with lactose intolerance can tolerate small amounts of lactose <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10708184/">without symptoms</a>.</p> <p>There are other differences too. Cow’s milk allergy is more common in children, though many infants will <a href="https://pubmed.ncbi.nlm.nih.gov/36185550/">grow out</a> of this allergy during childhood.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/30388735/">Lactose intolerance</a> is more common <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11155274/">in adults</a>, but can also sometimes be temporary. One type of lactose intolerance, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10708184/">secondary lactase deficiency</a>, can be caused by damage to the gut after infection or with medication use (such as antibiotics or cancer treatment). This can go away by itself when the underlying condition resolves or the person stops using the relevant medication.</p> <p>Whether an allergy or intolerance is likely to be lifelong depends on the food and the reason that the child or adult is reacting to it.</p> <p>Allergies to some foods, such as milk, egg, wheat and soy, often resolve during childhood, whereas allergies to nuts, fish or shellfish, often (but not always) <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7899184/">persist into adulthood</a>. We don’t know much about how likely children are to grow out of different types of food intolerances.</p> <h2>How do you find out what’s wrong?</h2> <p>If you think you may have a <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8152468/">food allergy or intolerance</a>, see a doctor.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7794657/">Allergy tests</a> help doctors find out which foods might be causing your allergic reactions (but can’t diagnose food intolerances). There are two common types: skin prick tests and blood tests.</p> <p>In a skin prick test, doctors put tiny amounts of allergens (the things that can cause allergies) on your skin and make small pricks to see if your body reacts.</p> <p>A blood test checks for allergen-specific immunoglobulin E (IgE) antibodies in your blood that show if you might be allergic to a particular food.</p> <p>Food intolerances can be tricky to figure out because the symptoms depend on what foods you eat and how much. To diagnose them, doctors look at your health history, and may do <a href="https://www.allergy.org.au/patients/food-other-adverse-reactions/food-intolerance">some tests</a> (such as a breath test). They may ask you to keep a record of foods you eat and timing of symptoms.</p> <p>A temporary elimination diet, where you stop eating certain foods, can also help to work out which foods you might be intolerant to. But this should only be done with the help of a doctor or dietitian, because eliminating particular foods can lead to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4604636/">nutritional deficiencies</a>, especially in children.</p> <h2>Is there a cure?</h2> <p>There’s currently no cure for food allergies or intolerances. For allergies in particular, it’s important to strictly avoid allergens. This means reading food labels carefully and being vigilant when eating out.</p> <p>However, researchers are studying a treatment called <a href="https://www.allergy.org.au/patients/allergy-treatments/oral-immunotherapy-for-food-allergy">oral immunotherapy</a>, which may help some people with food allergies become less sensitive to certain foods.</p> <p>Whether you have a food allergy or intolerance, your doctor or dietitian can help you to make sure you’re eating the right foods.</p> <p><em>Victoria Gibson, a Higher Degree by Research student and Research Officer at the School of Nursing, Midwifery and Social Work at the University of Queensland, and Rani Scott-Farmer, a Senior Research Assistant at the University of Queensland, contributed to this article.</em><!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/243685/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/jennifer-koplin-13384">Jennifer Koplin</a>, Group Leader, Childhood Allergy &amp; Epidemiology, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/desalegn-markos-shifti-1530163">Desalegn Markos Shifti</a>, Postdoctoral Research Fellow, Child Health Research Centre, Faculty of Medicine, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/whats-the-difference-between-a-food-allergy-and-an-intolerance-243685">original article</a>.</em></p> </div>

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Electrolyte beverages can help your body stay balanced − but may worsen symptoms if you’re sick

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/bryn-beeder-2260643">Bryn Beeder</a>, <a href="https://theconversation.com/institutions/miami-university-1934">Miami University</a></em></p> <p>For generations, <a href="https://performancepartner.gatorade.com/products">Gatorade</a> and similar electrolyte beverages have been helpful tools for athletes seeking a competitive edge.</p> <p>In 1965, <a href="https://explore.research.ufl.edu/historical-markers/gatorades-birthplace/">Dr. Robert Cade and a team of scientists</a> at the University of Florida College of Medicine created Gatorade to help their football players combat heat exhaustion and muscle cramps during long practices in extreme temperatures.</p> <p>The drink’s winning formula of water, sodium, potassium and sugar works effectively with the human body to keep users hydrated, refueling them with energy and optimizing muscle function.</p> <p>While I don’t work for or receive funding from Gatorade, <a href="https://miamioh.edu/profiles/ehs/bryn-beeder.html">as a registered dietitian and nutrition instructor</a>, I’ve watched how specific electrolyte beverages can be handpicked to boost hydration in hospitalized patients, student athletes and even myself.</p> <p>And while Gatorade was one of the first electrolyte beverages heavily marketed to consumers, its ingredient combination has paved the way for the creation of even more sport and electrolyte beverages on the grocery store shelves today. If you’re looking to gain a specific nutritional edge from a sports drink, you can seek out a registered dietitian for an individualized plan. Otherwise, if you’ve ever wondered what makes these colorful beverages a nutrition attraction, here’s a closer look at some key ingredients.</p> <h2>The importance of hydration</h2> <p>Whether people are athletes or not, the human body is constantly losing water through normal human functions such as sweating, urinating and even breathing. When water is lost, the body also excretes key electrolytes such as <a href="https://www.cdc.gov/salt/sodium-potassium-health/index.html">potassium and sodium</a>. These electrolytes are crucial for everything from heart function to muscle contractions.</p> <p><a href="https://my.clevelandclinic.org/health/diagnostics/21790-electrolytes">Electrolytes</a> get their “electro” name from having an electrical charge when dissolved in water. This charge allows them to work throughout the body in chemical reactions that maintain normal brain functioning, balance fluids inside and outside of body cells and even balance how acidic or alkaline your blood is.</p> <figure><iframe src="https://www.youtube.com/embed/l3VWb0mUS7Y?wmode=transparent&amp;start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe><figcaption><span class="caption">Electrolytes can help you rehydrate after a workout by balancing fluids in our cells.</span></figcaption></figure> <p>Major stress on the body can accelerate the <a href="https://my.clevelandclinic.org/health/diseases/9013-dehydration">dehydration process</a> – whether it’s intentional, like running a 5K, or unintentional, like getting a nasty stomach bug. If left unchecked, dehydration can cause more serious complications, such as fainting and irregular heartbeats.</p> <p>To prevent these complications, you need to replenish the fluids and electrolytes you’re losing. Stressful scenarios such as exercise and sickness are a perfect time to consider an electrolyte replacement drink.</p> <h2>A closer look at Gatorade’s ingredients</h2> <p>Water, the main ingredient in most sports drinks, <a href="https://www.eatright.org/health/essential-nutrients/water/how-much-water-do-you-need">hydrates you</a>. The human body is made up of <a href="https://www.usgs.gov/special-topics/water-science-school/science/water-you-water-and-human-body">approximately 60% water</a>, so to stay hydrated, it is important to listen to your body and drink water regularly. When the body’s water volume is decreased, it sends thirst signals to the brain.</p> <p>However, these signals often lag behind your hydration status. So, once you feel thirsty, your body is likely already slightly dehydrated. For a more accurate hydration assessment, check the <a href="https://health.clevelandclinic.org/what-urine-color-means">color of your urine</a>. Darker yellow or golden urine? Grab some water. Pale yellow or clear urine? Keep up the good hydration.</p> <p><a href="https://my.clevelandclinic.org/health/diagnostics/21790-electrolytes">Sodium, another ingredient in Gatorade, attracts water</a>. When you are dehydrated, the body’s blood is more concentrated because less water is circulating overall.</p> <p>When you have a lower blood volume, your blood vessels don’t expand as much as they normally would – ultimately lowering blood pressure. If blood pressure drops too quickly due to dehydration, you might feel dizziness, lightheadedness, nausea or weakness.</p> <p>The good news is that sodium actively pulls water into the bloodstream. So during an intense workout or while dealing with a dehydrating illness, consuming a salty snack or sports beverage can help.</p> <p><a href="https://health.clevelandclinic.org/potassium">The potassium in Gatorade regulates muscle contractions</a>. This electrolyte is especially critical for regulating your heartbeat, and it also aids in normal skeletal muscle contractions. If the body lacks enough potassium, painful muscle cramps or dizziness can disrupt your workout or day.</p> <p><a href="https://my.clevelandclinic.org/health/articles/15416-carbohydrates">Sugar provides quick energy</a> and nutrient absorption power. A traditional Gatorade beverage contains glucose and dextrose, which are both known as simple sugars. A simple sugar is one that the body can quickly digest and absorb, with the goal of quickly increasing blood sugar.</p> <p>Strenuous aerobic exercise or strength training for longer than 60 minutes, performing activities in very hot or humid climates, or the physical strain of an unwelcome illness can all rev the body’s metabolism and quickly deplete <a href="https://medlineplus.gov/bloodglucose.html">blood glucose</a>. When glucose levels drop, you may experience fatigue, weakness, lightheadedness, nausea or difficulty concentrating.</p> <p>The nutrient combination found in Gatorade was designed with athletes in mind, but it is also sometimes discussed as a remedy to consider during an unpleasant bout of gastrointestinal illness. <a href="https://my.clevelandclinic.org/health/diseases/4108-diarrhea">Diarrhea</a> and <a href="https://my.clevelandclinic.org/health/symptoms/8106-nausea--vomiting">vomiting</a> are easy routes for electrolytes such as sodium and potassium to escape.</p> <p>Energy drinks’ combination of simple sugars, water and electrolytes may be one strategy to maintain hydration during a time when food and fluids are difficult to stomach.</p> <p>However, be cautious – many traditional sports drinks have a high sugar content aimed at refueling lost energy during a workout. When that same sugar content is introduced to an upset gastrointestinal tract, it can pull in extra water, leading to more diarrhea. If you find yourself in this situation, here are some other options to consider.</p> <p>Opt for a lower-sugar electrolyte beverage. Beverages to consider include Pedialyte or even a broth-based soup. Both will hydrate with minimal added sugar content.</p> <p>The human body is incredibly efficient at managing nutrients in the blood. In most cases, balanced meals and water consumption are enough to meet your daily nutrient needs. During intense physical exercise or an unexpected illness, however, the body may struggle to maintain its usual balance.</p> <p>If you notice unusual symptoms such as dizziness, fatigue or persistent thirst, your body will need attention. In specific cases of dehydration from exercise or illness, a sports drink like Gatorade can be a simple tool to help you bounce back to your best self.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/243763/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/bryn-beeder-2260643">Bryn Beeder</a>, Visiting Instructor in Kinesiology, Nutrition, and Health, <a href="https://theconversation.com/institutions/miami-university-1934">Miami University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/electrolyte-beverages-can-help-your-body-stay-balanced-but-may-worsen-symptoms-if-youre-sick-243763">original article</a>.</em></p> </div>

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You can train your nose – and 4 other surprising facts about your sense of smell

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/lynn-nazareth-1650578">Lynn Nazareth</a>, <a href="https://theconversation.com/institutions/csiro-1035">CSIRO</a></em></p> <p>Would you give up your sense of smell to keep your hair? What about your phone?</p> <p>A <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8946147/">2022 US study</a> compared smell to other senses (sight and hearing) and personally prized commodities (including money, a pet or hair) to see what people valued more.</p> <p>The researchers found smell was viewed as much less important than sight and hearing, and valued less than many commodities. For example, half the women surveyed said they’d choose to keep their hair over sense of smell.</p> <p>Smell often goes under the radar as one of the least valued senses. But it is one of the <a href="https://royalsocietypublishing.org/doi/10.1098/rsob.200330">first sensory systems vertebrates developed</a> and is linked to your mental health, memory and more.</p> <p>Here are five fascinating facts about your olfactory system.</p> <h2>1. Smell is linked to memory and emotion</h2> <p>Why can the waft of fresh baking trigger joyful childhood memories? And why might a certain perfume jolt you back to a painful breakup?</p> <p>Smell is directly linked to both your memory and emotions. This connection was first established by American psychologist <a href="https://www.jstor.org/stable/16002">Donald Laird in 1935</a> (although French novelist <a href="https://www.penguin.co.uk/articles/2020/07/more-than-cake-unravelling-the-mysteries-of-proust-s-madeleine">Marcel Proust had already made it famous</a> in his reverie about the scent of madeleines baking.)</p> <p>Odours are first captured by special olfactory nerve cells inside your nose. These cells extend upwards from the roof of your nose towards the smell-processing centre of your brain, called the <a href="https://www.ncbi.nlm.nih.gov/books/NBK55972/">olfactory bulb</a>.</p> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=592&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=592&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=592&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=744&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=744&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/640871/original/file-20250107-15-vili6v.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=744&amp;fit=crop&amp;dpr=3 2262w" alt="Diagram showing odour particles travelling through the nose into the brain." /></a><figcaption><span class="caption">Smells are first detected by nerve cells in the nose.</span> <span class="attribution"><a class="source" href="https://www.shutterstock.com/image-illustration/sense-smell-detailed-illustration-olactory-region-1832630776">Axel_Kock/Shutterstock</a></span></figcaption></figure> <p>From the olfactory bulb they form direct connection with the brain’s <a href="https://my.clevelandclinic.org/health/body/limbic-system">limbic system</a>. This includes the <a href="https://www.sciencedirect.com/science/article/pii/S1879729610001237">amygdala</a>, where emotions are generated, and the <a href="https://academic.oup.com/brain/article/133/9/2509/357465">hippocampus</a>, where memories are created.</p> <p>Other senses – such as sight and hearing – aren’t directly connected to the lymbic system.</p> <p>One <a href="https://www.sciencedirect.com/science/article/pii/S0028393203002161">2004 study</a> used functional magnetic resonance imaging to demonstrate odours trigger a much stronger emotional and memory response in the brain than a visual cue.</p> <h2>2. Your sense of smell constantly regenerates</h2> <p>You can lose your ability to smell due to injury or infection – for example during and after a COVID infection. This is known as <a href="https://link.springer.com/article/10.1007/s00441-020-03381-9">olfactory dysfunction</a>. In most cases it’s temporary, returning to normal within a few weeks.</p> <p>This is because every few months <a href="https://www.nature.com/articles/s41593-020-0587-9">your olfactory nerve cells die and are replaced</a> by new cells.</p> <p>We’re not entirely sure how this occurs, but it likely involves your nose’s <a href="https://www.cell.com/heliyon/fulltext/S2405-8440(24)05979-6">stem cells</a>, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2387238/#:%7E:text=When%20the%20olfactory%20nerves%20and,reestablish%20connections%20with%20the%20bulb">the olfactory bulb</a> and <a href="https://onlinelibrary.wiley.com/doi/10.1002/cne.23694">other cells</a> in the olfactory nerves.</p> <p>Other areas of your nervous system – including your brain and spinal cord – cannot regenerate and repair after an injury.</p> <p>Constant regeneration may be a protective mechanism, as the olfactory nerves are vulnerable to damage caused by the external environment, including toxins (such as cigarette smoke), chemicals and pathogens (<a href="https://academic.oup.com/jid/article/210/3/419/2908527">such as the flu virus</a>).</p> <p>But following a COVID infection some people might continue to experience a loss of smell. Studies suggest <a href="https://www.sciencedirect.com/science/article/pii/S0092867421012824?via%3Dihub">the virus</a> and a <a href="https://www.science.org/doi/10.1126/scitranslmed.add0484">long-term immune response</a> damages the cells that allow the olfactory system to regenerate.</p> <h2>3. Smell is linked to mental health</h2> <p>Around <a href="https://journals.sagepub.com/doi/full/10.1177/1945892420946254">5% of the global population</a> suffer from anosmia – total loss of smell. An estimated 15-20% suffer partial loss, known as hyposmia.</p> <p>Given smell loss is often a primary and long-term symptom of COVID, these <a href="https://www.nature.com/articles/s41598-024-53919-y">numbers are likely to be higher</a> since the pandemic.</p> <p>Yet in Australia, the prevalence of olfactory dysfunction <a href="https://www1.racgp.org.au/ajgp/2021/september/an-approach-to-olfactory-impairments">remains surprisingly understudied</a>.</p> <p>Losing your sense of smell <a href="https://academic.oup.com/chemse/article/doi/10.1093/chemse/bjab037/6342176">is shown to impact your personal and social relationships</a>. For example, it can mean you miss out on shared eating experiences, or cause changes in sexual desire and behaviour.</p> <p>In older people, declining ability to smell is associated with a <a href="https://academic.oup.com/biomedgerontology/article/79/1/glad139/7207364?login=true">higher risk of depression</a> and <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107541">even death</a>, although we still don’t know why.</p> <h2>4. Loss of smell can help identify neurodegenerative diseases</h2> <p>Partial or full loss of smell is <a href="https://www.sciencedirect.com/science/article/pii/S1474442217301230?via%3Dihub">often an early indicator for a range of neurodegenerative diseases</a>, including Alzheimer’s and Parkinson’s diseases.</p> <p>Patients <a href="https://www.neurology.org/doi/abs/10.1212/wnl.0000000000001265">frequently report losing their sense of smell</a> years before any symptoms show in body or brain function. However many people are not <a href="https://onlinelibrary.wiley.com/doi/10.1002/9781118971758.ch18">aware they are losing their sense of smell</a>.</p> <p>There are ways you can determine if you have smell loss and to what extent. You may be able to visit a formal <a href="https://www.epworth.org.au/our-services/rehabilitation/brain-injury-and-neurological-disorders/olfactory-impairment-clinic#:%7E:text=Epworth%20is%20the%20first%20rehabilitation,and%20associated%20changes%20in%20taste.">smell testing centre</a> or do a <a href="https://esurvey.uniklinikum-dresden.de/pub/index.php/678693">self-test</a> at home, which assesses your ability to identify household items like coffee, wine or soap.</p> <h2>5. You can train your nose back into smelling</h2> <p>“Smell training” is emerging as a <a href="https://link.springer.com/article/10.1007/s00405-024-08733-7">promising experimental treatment option</a> for olfactory dysfunction. For people experiencing smell loss after COVID, it’s been show to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9309586/">improve the ability to detect and differentiate odours</a>.</p> <p>Smell training (or “olfactory training”) was first tested in 2009 in a <a href="https://onlinelibrary.wiley.com/doi/10.1002/lary.20101">German psychology study</a>. It involves sniffing robust odours — such as floral, citrus, aromatic or fruity scents — at least twice a day for 10—20 seconds at a time, usually over a 3—6 month period.</p> <p>Participants are asked to focus on the memory of the smell while sniffing and recall information about the odour and its intensity. This is <a href="https://jamanetwork.com/journals/jamaotolaryngology/fullarticle/2782042">believed to help reorganise the nerve connections</a> in the brain, although the exact mechanism behind it is unclear.</p> <p>Some studies recommend using a <a href="https://onlinelibrary.wiley.com/doi/10.1002/lary.20101">single set of scents</a>, while others recommend <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/lary.25245">switching to a new set of odours</a> after a certain amount of time. However <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/lary.26985">both methods show significant improvement</a> in smelling.</p> <p>This training has also been shown to alleviate depressive symptoms and improve cognitive decline both in <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/gps.4725">older adults</a> and those suffering from <a href="https://pubmed.ncbi.nlm.nih.gov/34749425/">dementia</a>.</p> <p>Just like physiotherapy after a physical injury, olfactory training is thought to act like <a href="https://www.sciencedirect.com/science/article/pii/S0149763422003426#sec0005">rehabilitation for your sense of smell</a>. It retrains the nerves in your nose and the connections it forms within the brain, allowing you to correctly detect, process and interpret odours.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/245366/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/lynn-nazareth-1650578">Lynn Nazareth</a>, Research Scientist in Olfactory Biology, <a href="https://theconversation.com/institutions/csiro-1035">CSIRO</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/you-can-train-your-nose-and-4-other-surprising-facts-about-your-sense-of-smell-245366">original article</a>.</em></p> </div>

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How do mosquito repellents work? A chemistry expert explains

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/daniel-eldridge-1494633">Daniel Eldridge</a>, <a href="https://theconversation.com/institutions/swinburne-university-of-technology-767">Swinburne University of Technology</a></em></p> <p>It’s summertime, and for many of us that means plenty of time outside – and, unfortunately, mosquitoes.</p> <p>The combination of the <a href="https://theconversation.com/why-your-summer-might-be-full-of-mosquitoes-according-to-a-scientist-98369">increase in temperature and plenty of water</a> is ideal for these blood-sucking insects to make their presence felt.</p> <p>In the best-case scenario, they are a pest, delivering a highly unpleasant sting. At the other end of the spectrum, they are vectors for diseases responsible for <a href="https://www.cdc.gov/global-health/impact/fighting-the-worlds-deadliest-animal.html">more human fatalities than any other animal on Earth</a>.</p> <p>To keep them at bay, many of us will reach for the bottle of insect repellent or citronella candles in order to avoid the bite and incessant itching that comes with it. But how do these repellents actually work?</p> <h2>A complex interplay</h2> <p><a href="https://www.mcgill.ca/oss/article/health-technology/why-mosquitos-bite-you-and-how-make-them-stop">A great deal</a> of research has gone into understanding how and why female mosquitoes – they are the ones that bite us – are attracted to people.</p> <p>There is evidence showing they are attracted to the <a href="https://www.nih.gov/news-events/nih-research-matters/how-mosquitoes-detect-people">carbon dioxide</a> we exhale, lactic acid found in our sweat, and a variety of other <a href="https://pubmed.ncbi.nlm.nih.gov/24315103/">skin odours</a> and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6482070/">volatile compounds</a> we give off. The interplay between all these factors is quite <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8906108/">complex</a>.</p> <p>To ward off mosquitoes, physical barriers such as netting make for the best protection. However, while you might put netting around a backdoor patio and barbecue, doing this for any large space is simply not practical.</p> <p>This is where repellents come in.</p> <h2>DEETerrent</h2> <p>There are a variety of mosquito repellents available.</p> <p>The most tried-and-true products are based on a substance called N,N-diethyl-meta-toluamide, more commonly referred to as DEET.</p> <p>This molecule has been commercially available since 1957, <a href="https://www.usda.gov/media/blog/2018/05/17/protecting-military-flying-foes">after the United States military discovered</a> it was an effective insect repellent.</p> <p>DEET is often used as a <a href="https://www.consumerreports.org/health/insect-repellent/how-safe-is-deet-insect-repellent-safety-a4952100929/">point of comparison</a> for <a href="https://www.nejm.org/doi/full/10.1056/NEJMoa011699">studies</a> investigating alternatives. <a href="https://scijournals.onlinelibrary.wiley.com/doi/full/10.1002/ps.5476?casa_token=prUg_pX7fjAAAAAA%3AuEKT5PGXWU1mO4fakwQ9NSEY-0uVYBEz25zWxXjMOp5AxX5UFWENJc1UF_JdsKA45x3sSHpmJSLJSwM">Studies show that</a>, provided they are used according to direction, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4041896/">DEET products are safe and effective</a>.</p> <p>For example, it is recommended that when required, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9458079/">sunscreen is applied</a> before the repellent. DEET products are not recommended for infants.</p> <p>The exact mechanism by which DEET repels mosquitoes and other insects is <a href="https://www.tandfonline.com/doi/full/10.1080/19336934.2015.1079360#d1e132">still explored</a> <a href="https://link.springer.com/article/10.1007/s13258-020-00991-z">today</a>.</p> <p>Many studies link its success to mosquitoes having receptors that sense the presence of DEET, deterring them from closely approaching our skin. Some investigations suggest that when DEET is detected, it <a href="https://pubmed.ncbi.nlm.nih.gov/18339904/">inhibits mosquitoes’ attraction</a> to us, while others show evidence that mosquitoes “<a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2518096/pdf/zpq13598.pdf">smell and avoid</a>” DEET.</p> <p>There are also numerous reports demonstrating mosquitoes don’t bite when they <a href="https://www.cell.com/current-biology/pdfExtended/S0960-9822(19)30402-6">land on</a> DEET-treated skin. This is because DEET acts as a contact-based repellent and conveys a chemical message to mosquitoes to leave. <a href="https://www.tandfonline.com/doi/full/10.1080/19336934.2015.1079360">Studies</a> <a href="https://www.cell.com/current-biology/pdfExtended/S0960-9822(19)30402-6">suggest</a> that DEET likely works through a combination of the processes described here.</p> <h2>Effective alternatives</h2> <p>Another more recent family of mosquito repellent products rely on an active ingredient called picaridin (or icaridin).</p> <p>The current consensus is that picaridin products are safe, and highly effective. For many, they are considered appealing as they <a href="https://www.sciencedirect.com/science/article/pii/S0190962207014673?casa_token=zzPMhkW9QtIAAAAA:Euk6hjWnuiem6OAq020Xv0Pu70K7LfN_siLGcK1DIyOZn-mbH7U9tKK115rAK0rYbWQ2oaMGfg#bib49">don’t have as strong a scent</a> as DEET.</p> <p>Picaridin products have been reported to be <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4270489/">equally effective</a> as DEET, or in some cases, even <a href="https://academic.oup.com/jtm/article/25/suppl_1/S10/4990399">slightly superior</a>, though the outcome depends on their concentration too.</p> <p>The other repellent regularly reported as being effective is para-menthane-3,8-diol (PMD).</p> <p>This is produced by chemical treatment of <a href="https://www.phrp.com.au/issues/december-2016-volume-26-issue-5/a-review-of-recommendations-on-the-safe-and-effective-use-of-topical-mosquito-repellents/">oil of lemon eucalyptus</a>.</p> <p>Untreated, this oil isn’t effective at repelling mosquitoes. However, <a href="https://onlinelibrary.wiley.com/doi/10.1002/(SICI)1099-1573(199606)10:4%3C313::AID-PTR854%3E3.0.CO;2-O">several</a> <a href="https://journals.sagepub.com/doi/full/10.1016/j.wem.2015.11.007">studies</a> have shown that PMD is an effective mosquito repellent.</p> <p>The ability of these repellents to deter mosquitoes is <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4270489/">dose</a> <a href="https://academic.oup.com/jtm/article/25/suppl_1/S10/4990399">dependent</a>.</p> <p>In all cases, it’s important that an appropriate dose is applied, with re-application sometimes required to keep protection to a maximum. The performance of these products varies according to many other variables too, including <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4270489/">the species of mosquito</a>.</p> <h2>What about citronella?</h2> <p>Citronella products, including candles and topical formulations, are popular choices for keeping mosquitoes away.</p> <p>However, in systematic testing, these <a href="https://onlinelibrary.wiley.com/doi/10.1155/2015/361021">have been shown</a> to be <a href="https://www.nejm.org/doi/full/10.1056/NEJMoa011699">far less effective</a> than DEET.</p> <p>Studies have also shown that <a href="https://academic.oup.com/jinsectscience/article/17/1/24/2996380?login=false">citronella candles don’t</a> <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4617422/">fend off mosquitoes</a> <a href="https://pubmed.ncbi.nlm.nih.gov/8827606/">as much</a> as you might like.</p> <p>There are many other repellent products on the market.</p> <p>Given the widespread interest in preventing mosquito bites, natural remedies abound. It’s important to recognise that natural <a href="https://academic.oup.com/jinsectscience/article/17/1/24/2996380?login=false">isn’t necessarily more effective</a> and it <a href="https://theconversation.com/what-does-a-chemical-do-addressing-misconceptions-about-chemistry-104085">isn’t necessarily safer</a>.</p> <p>In <a href="https://www.nejm.org/doi/full/10.1056/NEJMoa011699">most reported studies</a>, DEET and picaridin are reported as having the greatest duration of protection (of the order of hours) and greatest effect on the mosquitoes. They are more thoroughly tested than many alternatives.</p> <p>When others are tested, they are often found wanting.</p> <p>One study described sound-based devices as being the repellent equivalent of <a href="https://academic.oup.com/jinsectscience/article/17/1/24/2996380?login=false">snake oil</a>. And although repellent bracelets contain working ingredients, they are largely ineffective in that form. This is because of insufficient concentrations of the active ingredient being “emitted”.</p> <p>When it comes to preventing disease transmission via mosquitoes, the <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4041896/">benefits</a> of the proven repellents far outweigh the risks.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/244403/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/daniel-eldridge-1494633">Daniel Eldridge</a>, Senior Lecturer in Chemistry, <a href="https://theconversation.com/institutions/swinburne-university-of-technology-767">Swinburne University of Technology</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-do-mosquito-repellents-work-a-chemistry-expert-explains-244403">original article</a>.</em></p> </div>

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What are plyometric exercises? How all that hopping and jumping builds strength, speed and power

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/justin-keogh-129041">Justin Keogh</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> and <a href="https://theconversation.com/profiles/mandy-hagstrom-1180806">Mandy Hagstrom</a>, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a></em></p> <p>If you’ve ever seen people at the gym or the park jumping, hopping or hurling weighted balls to the ground, chances are they were doing plyometric exercises.</p> <p>Examples include:</p> <ul> <li><a href="https://www.youtube.com/watch?v=DEwh2mRg3EU&amp;t=315s">box jumps</a>, where you repeatedly leap quickly on and off a box</li> <li><a href="https://www.youtube.com/watch?v=gS4F_YrwZVs">lateral skater hops</a>, where you bound from side to side like a speeding ice skater</li> <li>rapidly throwing a heavy <a href="https://www.youtube.com/watch?v=2iGj4gdfv4E&amp;t=175s">medicine ball against a wall</a>, or to the ground</li> <li>single leg hops, which may involve hopping on the spot or through an obstacle course</li> <li>squat jumps, where you repeatedly squat and then launch yourself into the air.</li> </ul> <p>There are many <a href="https://us.humankinetics.com/products/training-for-speed-agility-and-quickness-3rd-edition-with-hkpropel-online-video?srsltid=AfmBOor2XNPNu3WtrytuxooFb_HmqXf6kEYwlBILhmEiMO2O1uOTIj81">more examples</a> of <a href="https://us.humankinetics.com/products/plyometrics-pdf">plyometric exercises</a>.</p> <p>What ties all these moves together is that they use what’s known as the “<a href="https://www.frontiersin.org/research-topics/10437/the-stretch-shortening-cycle-of-active-muscle-and-muscle-tendon-complex-what-why-and-how-it-increases-muscle-performance/magazine">stretch shortening cycle</a>”. This is where your muscles rapidly stretch and then contract.</p> <h2>Potential benefits</h2> <p>Research shows incorporating plyometric exercise into your routine can help you:</p> <ul> <li><a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2024.1302610/full">jump higher</a></li> <li><a href="https://pubmed.ncbi.nlm.nih.gov/22450257/">sprint faster</a></li> <li>reduce the chances of getting a serious sporting injuries such as anterior cruciate ligament <a href="https://pubmed.ncbi.nlm.nih.gov/36244964/">(ACL) tears</a></li> <li>build <a href="https://pubmed.ncbi.nlm.nih.gov/19897415/">muscle strength</a></li> <li>improve <a href="https://pubmed.ncbi.nlm.nih.gov/38305252/">bone mineral density</a> (especially when combined with <a href="https://pubmed.ncbi.nlm.nih.gov/33357834/">resistance training</a> such as weight lifting), which is particularly important for women and older people at risk of falls.</li> </ul> <p>Studies have found plyometric exercises can help:</p> <ul> <li><a href="https://pubmed.ncbi.nlm.nih.gov/30387072/">older people</a> who want to retain and build muscle strength, boost bone health, improve posture and reduce the risk of falls</li> <li>adolescent athletes who want to build the <a href="https://pubmed.ncbi.nlm.nih.gov/36767213/">explosive strength</a> needed to excel in sports such as athletics, tennis, soccer, basketball and football</li> <li><a href="https://pubmed.ncbi.nlm.nih.gov/27704484/">female athletes</a> who want to jump higher or change direction quickly (a useful skill in many sports)</li> <li><a href="https://pubmed.ncbi.nlm.nih.gov/33956587/">endurance runners</a> who want to boost physical fitness, run time and athletic performance.</li> </ul> <p>And when it comes to plyometric exercises, you get out what you put in.</p> <p>Research has found the benefits of plyometrics are significantly greater when every jump was performed with <a href="https://pubmed.ncbi.nlm.nih.gov/30741877/">maximum effort</a>.</p> <h2>Potential risks</h2> <p>All exercise comes with risk (as does <em>not</em> doing enough exercise!)</p> <p>Plyometrics are high-intensity activities that require the body to absorb a lot of impact when landing on the ground or catching medicine balls.</p> <p>That means there is some risk of musculoskeletal injury, particularly if the combination of intensity, frequency and volume is too high.</p> <p>You might miss a landing and fall, land in a weird way and crunch your ankle, or get a muscle tear if you’re overdoing it.</p> <p>The National Strength and Conditioning Association, a US educational nonprofit that uses research to support coaches and athletes, <a href="https://www.nsca.com/store/product-detail/BOOK/2275/9781718210868">recommends</a>:</p> <ul> <li>a maximum of one to three plyometric sessions per week</li> <li>five to ten repetitions per set and</li> <li>rest periods of one to three minutes between sets to ensure complete muscle recovery.One <a href="https://pubmed.ncbi.nlm.nih.gov/30387072/">meta-analysis</a>, where researchers looked at many studies, found plyometric training was feasible and safe, and could improve older people’s performance, function and health.</li> </ul> <p>Overall, with appropriate programming and supervision, plyometric exercise can be a safe and effective way to boost your health and athletic performance.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/246322/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/justin-keogh-129041">Justin Keogh</a>, Associate Dean of Research, Faculty of Health Sciences and Medicine, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> and <a href="https://theconversation.com/profiles/mandy-hagstrom-1180806">Mandy Hagstrom</a>, Senior Lecturer, Exercise Physiology. School of Health Sciences, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-are-plyometric-exercises-how-all-that-hopping-and-jumping-builds-strength-speed-and-power-246322">original article</a>.</em></p> </div>

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How we diagnose and define obesity is set to change – here’s why, and what it means for treatment

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/louise-baur-5284">Louise Baur</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/john-b-dixon-11630">John B. Dixon</a>, <a href="https://theconversation.com/institutions/swinburne-university-of-technology-767">Swinburne University of Technology</a>; <a href="https://theconversation.com/profiles/priya-sumithran-1529047">Priya Sumithran</a>, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a>, and <a href="https://theconversation.com/profiles/wendy-a-brown-1665">Wendy A. Brown</a>, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a></em></p> <p>Obesity is <a href="https://www.niddk.nih.gov/health-information/weight-management/adult-overweight-obesity/health-risks#:%7E:text=Having%20overweight%20or%20obesity%20increases,the%20cells%20in%20your%20body">linked to</a> many common diseases, such as type 2 diabetes, heart disease, fatty liver disease and knee osteoarthritis.</p> <p>Obesity is currently defined using a person’s body mass index, or BMI. This is <a href="https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight">calculated</a> as weight (in kilograms) divided by the square of height (in metres). In people of European descent, the BMI for obesity is 30 kg/m² and over.</p> <p>But the risk to health and wellbeing is not determined by weight – and therefore BMI – alone. We’ve been part of a global collaboration that has spent the past two years discussing how this should change. Today we publish how we think obesity should be defined and why.</p> <p>As we outline in <a href="https://www.thelancet.com/commissions/clinical-obesity">The Lancet</a>, having a larger body shouldn’t mean you’re diagnosed with “clinical obesity”. Such a diagnosis should depend on the level and location of body fat – and whether there are associated health problems.</p> <h2>What’s wrong with BMI?</h2> <p>The risk of ill health depends on the relative percentage of fat, bone and muscle making up a person’s body weight, as well as where the fat is distributed.</p> <p>Athletes with a relatively high muscle mass, for example, may have a higher BMI. Even when that athlete has a BMI over 30 kg/m², their higher weight is due to excess muscle rather than excess fatty tissue.</p> <p>People who carry their excess fatty tissue <a href="https://www.abc.net.au/news/health/2017-09-06/waist-size-why-it-matters-and-when-its-a-risk/8839708">around their waist</a> are at greatest risk of the health problems associated with obesity.</p> <p>Fat stored deep in the abdomen and around the internal organs can release damaging molecules into the blood. These can then <a href="https://theconversation.com/body-fat-deep-below-the-surface-is-a-toxic-risk-especially-for-your-heart-146307">cause problems</a> in other parts of the body.</p> <p>But BMI alone does not tell us whether a person has health problems related to excess body fat. People with excess body fat don’t always have a BMI over 30, meaning they are not investigated for health problems associated with excess body fat. This might occur in a very tall person or in someone who tends to store body fat in the abdomen but who is of a “healthy” weight.</p> <p>On the other hand, others who aren’t athletes but have excess fat may have a high BMI but no associated health problems.</p> <p>BMI is therefore an imperfect tool to help us diagnose obesity.</p> <h2>What is the new definition?</h2> <p>The goal of the <a href="https://pubmed.ncbi.nlm.nih.gov/36878238">Lancet Diabetes &amp; Endocrinology Commission on the Definition and Diagnosis of Clinical Obesity </a> was to develop an approach to this definition and diagnosis. The commission, established in 2022 and led from King’s College London, has brought together 56 experts on aspects of obesity, including people with lived experience.</p> <p>The commission’s <a href="https://www.thelancet.com/commissions/clinical-obesity">definition and new diagnostic criteria</a> shifts the focus from BMI alone. It incorporates other measurements, such as waist circumference, to confirm an excess or unhealthy distribution of body fat.</p> <p>We define two categories of obesity based on objective signs and symptoms of poor health due to excess body fat.</p> <p><strong>1. Clinical obesity</strong></p> <p>A person with clinical obesity has signs and symptoms of ongoing organ dysfunction and/or difficulty with day-to-day activities of daily living (such as bathing, going to the toilet or dressing).</p> <p>There are 18 diagnostic criteria for clinical obesity in adults and 13 in children and adolescents. These include:</p> <ul> <li> <p>breathlessness caused by the effect of obesity on the lungs</p> </li> <li> <p>obesity-induced heart failure</p> </li> <li> <p>raised blood pressure</p> </li> <li> <p>fatty liver disease</p> </li> <li> <p>abnormalities in bones and joints that limit movement in children.</p> </li> </ul> <p><strong>2. Pre-clinical obesity</strong></p> <p>A person with pre-clinical obesity has high levels of body fat that are not causing any illness.</p> <p>People with pre-clinical obesity do not have any evidence of reduced tissue or organ function due to obesity and can complete day-to-day activities unhindered.</p> <p>However, people with pre-clinical obesity are generally at higher risk of developing diseases such as heart disease, some cancers and type 2 diabetes.</p> <h2>What does this mean for obesity treatment?</h2> <p>Clinical obesity is a disease requiring access to effective health care.</p> <p>For those with clinical obesity, the focus of health care should be on improving the health problems caused by obesity. People should be offered evidence-based treatment options after discussion with their health-care practitioner.</p> <p><a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)01210-8/abstract">Treatment</a> will <a href="https://www.thelancet.com/journals/landia/article/PIIS2213-8587(22)00047-X/fulltext">include</a> management of obesity-associated complications and may include specific obesity treatment aiming at decreasing fat mass, such as:</p> <ul> <li> <p>support for <a href="https://www.obesityevidencehub.org.au/collections/treatment/behavioural-interventions-for-the-management-of-overweight-and-obesity-in-adults">behaviour change</a> <a href="https://www.obesityevidencehub.org.au/collections/treatment/managing-overweight-and-obesity-in-children-and-adolescents">around</a> diet, physical activity, sleep and screen use</p> </li> <li> <p>obesity-management medications to reduce appetite, lower weight and <a href="https://www.obesityevidencehub.org.au/collections/treatment/medication-and-surgery-for-the-treatment-of-overweight-and-obesity-in-adults">improve health</a> outcomes such as blood glucose (sugar) and blood pressure</p> </li> <li> <p>metabolic <a href="https://theconversation.com/thinking-about-bariatric-surgery-for-weight-loss-heres-what-to-consider-184153">bariatric surgery</a> to treat obesity or reduce weight-related health complications.</p> </li> </ul> <h2>Should pre-clinical obesity be treated?</h2> <p>For those with pre-clinical obesity, health care should be about risk-reduction and prevention of health problems related to obesity.</p> <p>This may require health counselling, including support for health behaviour change, and monitoring over time.</p> <p>Depending on the person’s individual risk – such as a family history of disease, level of body fat and changes over time – they may opt for one of the obesity treatments above.</p> <p>Distinguishing people who don’t have illness from those who already have ongoing illness will enable personalised approaches to obesity prevention, management and treatment with more appropriate and cost-effective allocation of resources.</p> <h2>What happens next?</h2> <p>These new criteria for the diagnosis of clinical obesity will need to be adopted into national and international clinical practice guidelines and a range of obesity strategies.</p> <p>Once adopted, training health professionals and health service managers, and educating the general public, will be vital.</p> <p>Reframing the narrative of obesity may help eradicate misconceptions that contribute to stigma, including making false assumptions about the health status of people in larger bodies. A better understanding of the biology and health effects of obesity should also mean people in larger bodies are not blamed for their condition.</p> <p>People with obesity or who have larger bodies should expect personalised, evidence-based assessments and advice, free of stigma and blame.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/245164/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/louise-baur-5284"><em>Louise Baur</em></a><em>, Professor, Discipline of Child and Adolescent Health, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/john-b-dixon-11630">John B. Dixon</a>, Adjunct Professor, Iverson Health Innovation Research Institute, <a href="https://theconversation.com/institutions/swinburne-university-of-technology-767">Swinburne University of Technology</a>; <a href="https://theconversation.com/profiles/priya-sumithran-1529047">Priya Sumithran</a>, Head of the Obesity and Metabolic Medicine Group in the Department of Surgery, School of Translational Medicine, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a>, and <a href="https://theconversation.com/profiles/wendy-a-brown-1665">Wendy A. Brown</a>, Professor and Chair, Monash University Department of Surgery, School of Translational Medicine, Alfred Health, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-we-diagnose-and-define-obesity-is-set-to-change-heres-why-and-what-it-means-for-treatment-245164">original article</a>.</em></p> </div>

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Dame Judi Dench shares update on her deteriorating health

<p>Dame Judi Dench has revealed she can no longer leave her house by herself due to her worsening eyesight. </p> <p>The legendary British actress, 90, opened up about her deteriorating health in a candid chat on the <em>Fearless</em> podcast with Trinny Woodall, admitting she must be accompanied by someone everywhere she goes in case she falls over or bangs into something.</p> <p>Judi said, “Somebody will always be with me; I have to now because I can’t see and I will walk into something or fall over.”</p> <p>Aside from her declining sight, which is caused by age-related macular degeneration, Judi says she prefers to be supported by others and is “not very good at being on my own”.</p> <p>She told the podcast host, “I’m always nervous before going to something. I have no idea why...I’m not good at being on my own at all, nor would I be now."</p> <p>“And fortunately, I don’t have to now because I pretend to have no eyesight,” Judi joked. </p> <p>In 2024, Dench hinted that her acting career could be over as her worsening eyesight makes it "impossible" to learn lines. </p> <p>When asked about her career at the Chelsea Flower Show in May, the Oscar winner replied: "No, no, I can't even see!"</p> <p>Judi, who was diagnosed with macular degeneration in 2012, said she has tried to work “as much as she can” but finds any part “difficult” to play.</p> <p>She told <a href="https://www.express.co.uk/celebrity-news/2002898/dame-judi-dench-health-issue?int_source=nba" target="_blank" rel="noopener"><em>Express.co.uk</em></a>, "I have so many friends who will teach me the script. But I have a photographic memory, so I have to know where it is on the page, and that's quite a difficult thing."</p> <p>"That's what makes it really impossible so far [not knowing exactly where the text is]. But I'll find a way."</p> <p><em>Image credits: Shutterstock</em></p>

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What’s the difference between heat exhaustion and heat stroke? One’s a medical emergency

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/matthew-barton-1184088">Matthew Barton</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a> and <a href="https://theconversation.com/profiles/michael-todorovic-1210507">Michael Todorovic</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a></em></p> <p>When British TV doctor Michael Mosley died last year in Greece after walking in extreme heat, local police said “<a href="https://www.telegraph.co.uk/news/2024/06/10/michael-mosley-autopsy-symi-greece-death/">heat exhaustion</a>” was a contributing factor.</p> <p>Since than a coroner could not find a definitive cause of death <a href="https://www.theguardian.com/media/2024/dec/20/michael-mosleys-cause-of-death-unascertainable-coroner-says">but said</a> this was most likely due to an un-identified medical reason or heat stroke.</p> <p>Heat exhaustion and heat stroke are two illnesses that relate to heat.</p> <p>So what’s the difference?</p> <h2>A spectrum of conditions</h2> <p>Heat-related illnesses range from mild to severe. They’re caused by exposure to excessive heat, whether from hot conditions, physical exertion, or both. The most common ones include:</p> <ul> <li> <p><strong>heat oedema</strong>: swelling of the hands, feet and ankles</p> </li> <li> <p><strong>heat cramps</strong>: painful, involuntary muscle spasms usually after exercise</p> </li> <li> <p><strong>heat syncope</strong>: fainting due to overheating</p> </li> <li> <p><strong>heat exhaustion</strong>: when the body loses water due to excessive sweating, leading to a rise in core body temperature (but still under 40°C). Symptoms include lethargy, weakness and dizziness, but there’s no change to consciousness or mental clarity</p> </li> <li> <p><strong>heat stroke</strong>: a medical emergency when the core body temperature is over 40°C. This can lead to serious problems related to the nervous system, such as confusion, seizures and unconsciousness including coma, leading to death.</p> </li> </ul> <p>As you can see from the diagram below, some symptoms of heat stroke and heat exhaustion overlap. This makes it hard to recognise the difference, even for medical professionals.</p> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=455&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=455&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=455&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=572&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=572&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/636118/original/file-20241204-15-qhk6rk.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=572&amp;fit=crop&amp;dpr=3 2262w" alt="Heat exhaustion vs heat stroke venn diagram" /></a><figcaption><span class="attribution"><a class="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA</a></span></figcaption></figure> <h2>How does this happen?</h2> <p>The human body is an incredibly efficient and adaptable machine, equipped with several in-built mechanisms to keep our core temperature at an optimal 37°C.</p> <p>But in healthy people, regulation of body temperature begins to break down when it’s hotter than about 31°C with 100% humidity (think Darwin or Cairns) or about 38°C with 60% humidity (typical of other parts of Australia in summer).</p> <p>This is because humid air makes it harder for sweat to evaporate and take heat with it. Without that cooling effect, the body starts to overheat.</p> <p>Once the core temperature rises above 37°C, heat exhaustion can set in, which can cause intense thirst, weakness, nausea and dizziness.</p> <p>If the body heat continues to build and the core body temperature rises above 40°C, a much more severe heat stroke could begin. At this point, it’s a life-threatening emergency requiring immediate medical attention.</p> <p>At this temperature, our proteins start to denature (like an egg on a hotplate) and blood flow to the intestines stops. This makes the gut very leaky, allowing harmful substances such as endotoxins (toxic substances in some bacteria) and pathogens (disease causing microbes) to leak into the bloodstream.</p> <p>The liver can’t detoxify these fast enough, leading to the whole body becoming inflamed, organs failing, and in the worst-case scenario, death.</p> <h2>Who’s most at risk?</h2> <p>People doing strenuous exercise, especially if they’re not in great shape, are among those at risk of heat exhaustion or heat stroke. <a href="https://www.who.int/multi-media/details/main-heat-vulnerability-factors">Others at risk</a> include those exposed to high temperatures and humidity, particularly when wearing heavy clothing or protective gear.</p> <p>Outdoor workers such as farmers, firefighters and construction workers are at higher risk too. Certain health conditions, such as diabetes, heart disease, or lung conditions (such as COPD or chronic obstructive pulmonary disease), and people taking <a href="https://theconversation.com/is-my-medicine-making-me-feel-hotter-this-summer-5-reasons-why-199085">blood pressure medications</a>, can also be more vulnerable.</p> <p>Adults over 65, infants and young children are especially sensitive to heat as they are less able to physically cope with fluctuations in heat and humidity.</p> <h2>How are these conditions managed?</h2> <p>The risk of serious illness or death from heat-related conditions is very low if treatment starts early.</p> <p><a href="https://www.redcross.org.au/emergencies/prepare/heatstroke-and-heat-exhaustion/">For heat exhaustion</a>, have the individual lie down in a cool, shady area, loosen or remove excess clothing, and cool them by fanning, moistening their skin, or immersing their hands and feet in cold water.</p> <p>As people with heat exhaustion almost always are dehydrated and have low electrolytes (certain minerals in the blood), they will usually need to drink fluids.</p> <p>However, emergency hospital care is essential for heat stroke. In hospital, health professionals will focus on stabilising the patient’s:</p> <ul> <li><strong>airway</strong> (ensure no obstructions, for instance, vomit)</li> <li><strong>breathing</strong> (look for signs of respiratory distress or oxygen deprivation)</li> <li><strong>circulation</strong> (check pulse, blood pressure and signs of shock).</li> </ul> <p>Meanwhile, they will use rapid-cooling techniques including immersing the whole body in cold water, or applying wet ice packs covering the whole body.</p> <h2>Take home points</h2> <p>Heat-related illnesses, such as heat stroke and heat exhaustion, are serious health conditions that can lead to severe illness, or even death.</p> <p>With <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(21)01208-3/fulltext">climate change, heat-related illness</a> will become more common and more severe. So recognising the early signs and responding promptly are crucial to prevent serious complications.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/240992/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/matthew-barton-1184088"><em>Matthew Barton</em></a><em>, Senior lecturer, School of Nursing and Midwifery, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a> and <a href="https://theconversation.com/profiles/michael-todorovic-1210507">Michael Todorovic</a>, Associate Professor of Medicine, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/whats-the-difference-between-heat-exhaustion-and-heat-stroke-ones-a-medical-emergency-240992">original article</a>.</em></p> </div>

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Why do some people’s hair and nails grow quicker than mine?

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/michelle-moscova-310728">Michelle Moscova</a>, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a></em></p> <p>Throughout recorded history, our hair and nails played an important role in signifying who <a href="https://www.psychiatrictimes.com/view/gender-culture-and-social-constructs-in-body-focused-repetitive-behaviors">we are and our social status</a>. You could say, they separate the caveman from businessman.</p> <p>It was no surprise then that many of us found a new level of appreciation for our hairdressers and nail artists during the COVID lockdowns. Even Taylor Swift reported <a href="https://abcnews.go.com/GMA/Culture/taylor-swift-reveals-shes-cutting-hair-covid-19/story?id=74757540&amp;t">she cut her own hair during lockdown</a>.</p> <p>So, what would happen if all this hair and nail grooming got too much for us and we decided to give it all up. Would our hair and nails just keep on growing?</p> <p>The answer is yes. The hair on our head grows, on average, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9917549/">1 centimeter per month</a>, while our fingernails grow an average of just <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11436330/">over 3 millimetres</a>.</p> <p>When left unchecked, our hair and nails can grow to impressive lengths. Aliia Nasyrova, known as the Ukrainian Rapunzel, holds the world record for the longest locks on a living woman, which measure an <a href="https://www.youtube.com/watch?v=1TdlEIQdVwo&amp;t=81s">impressive 257.33 cm</a>.</p> <p>When it comes to record-breaking fingernails, Diana Armstrong from the United States holds that record <a href="https://www.youtube.com/watch?v=nwql937j-7Q">at 1,306.58 cm</a>.</p> <p>Most of us, however, get regular haircuts and trim our nails – some with greater frequency than others. So why do some people’s hair and nails grow more quickly?</p> <h2>Remind me, what are they made out of?</h2> <p>Hair and nails are made mostly from keratin. Both grow from matrix cells below the skin and grow through different patterns of cell division.</p> <p>Nails grow steadily from the matrix cells, which sit under the skin at the base of the nail. These cells divide, pushing the older cells forward. As they grow, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5383514/">the new cells slide</a> along the nail bed – the flat area under the fingernail which looks pink because of its rich blood supply.</p> <p>A hair also starts growing from the matrix cells, eventually forming the visible part of the hair – the shaft. The hair shaft grows from a root that sits under the skin and is wrapped in a sac known as the hair follicle.</p> <p>This sac has a nerve supply (which is why it hurts to pull out a hair), oil-producing glands that lubricate the hair and a tiny muscle that <a href="https://www.ncbi.nlm.nih.gov/books/NBK546248/">makes your hair stand up</a> when it’s cold.</p> <p>At the follicle’s base is the hair bulb, which contains the all-important hair papilla that supplies blood to the follicle.</p> <p>Matrix cells near the papilla divide to produce new hair cells, which then harden and form the hair shaft. As the new hair cells are made, the hair is pushed up above the skin <a href="https://www.jidonline.org/article/S0022-202X(15)41553-2/fulltext">and the hair grows</a>.</p> <p>But the papilla also plays an integral part in regulating hair growth cycles, as it sends signals to the stem cells to move to the base of the follicle and form a hair matrix. Matrix cells then get signals to divide and start a new growth phase.</p> <h2>Unlike nails, our hair grows in cycles</h2> <p>Scientists have identified <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9917549/">four phases of hair growth</a>, the:</p> <ol> <li> <p>anagen or growth phase, which lasts between two and eight years</p> </li> <li> <p>catagen or transition phase, when growth slows down, lasting around two weeks</p> </li> <li> <p>telogen or resting phase, when there is no growth at all. This usually lasts two to three months</p> </li> <li> <p>exogen or shedding phase, when the hair falls out and is replaced by the new hair growing from the same follicle. This starts the process all over again.</p> </li> </ol> <figure class="align-center "><img src="https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=308&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=308&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=308&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=387&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=387&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/637402/original/file-20241210-15-gtv259.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=387&amp;fit=crop&amp;dpr=3 2262w" alt="Stages of hair growth graphic" /><figcaption><span class="caption">Hair follicles enter these phases at different times so we’re not left bald.</span> <span class="attribution"><a class="source" href="https://www.shutterstock.com/image-vector/stages-hair-growth-cycle-vector-isolated-2433656865">Mosterpiece/Shutterstock</a></span></figcaption></figure> <p>Each follicle goes through this cycle <a href="https://www.longdom.org/open-access/a-note-on-the-human-hair-follicle-from-the-origin-to-the-death-93871.html?t">10–30 times in its lifespan</a>.</p> <p>If all of our hair follicles grew at the same rate and entered the same phases simultaneously, there would be times when we would all be bald. That doesn’t usually happen: at any given time, only one in ten hairs is in the resting phase.</p> <p>While we lose about <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9917549/">100–150 hairs daily</a>, the average person has <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9917549/">100,000 hairs</a> on their head, so we barely notice this natural shedding.</p> <h2>So what affects the speed of growth?</h2> <p>Genetics is the most significant factor. While hair growth rates vary between individuals, they tend to be <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4201279/">consistent among family members</a>.</p> <p>Nails are also influenced by genetics, as siblings, especially identical twins, tend to have <a href="https://link.springer.com/referenceworkentry/10.1007/978-3-319-26594-0_121-1">similar nail growth rates</a>.</p> <p>But there are also other influences.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9917549/">Age makes a difference</a> to hair and <a href="https://link.springer.com/referenceworkentry/10.1007/978-3-319-26594-0_121-1">nail</a> growth, even in healthy people. Younger people generally have faster growth rates because of the slowing metabolism and cell division that comes with ageing.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7432488/">Hormonal changes</a> can have an impact. Pregnancy often <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7432488/">accelerates</a> hair and nail growth rates, while menopause and high levels of the stress hormone cortisol can <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7432488/">slow growth rates</a>.</p> <p>Nutrition also changes <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6380979/">hair</a> and <a href="https://ijdvl.com/nails-in-nutritional-deficiencies/?t">nail</a> strength and growth rate. While hair and nails are made mostly of keratin, they also contain water, fats and various minerals. As hair and nails keep growing, these minerals need to be replaced.</p> <p>That’s why a balanced diet that includes sufficient nutrients to support your hair and nails is essential for maintaining their health.</p> <p>Nutrient deficiencies may contribute to hair loss and nail breakage by disrupting their growth cycle or weakening their structure. Iron and zinc deficiencies, for example, have both been linked to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6380979/">hair loss</a> and <a href="https://ijdvl.com/nails-in-nutritional-deficiencies/?t">brittle nails</a>.</p> <p>This may explain why thick hair and strong, well-groomed nails have long been associated with perception of good health and high status.</p> <p>However, not all perceptions are true.</p> <h2>No, hair and nails don’t grow after death</h2> <p>A persistent myth that may relate to <a href="https://www.britannica.com/topic/vampire">the legends of vampires</a> is that hair and nails continue to grow after we die.</p> <p>In reality, they only <em>appear</em> to do so. As the body dehydrates after death, the skin shrinks, making hair and nails <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2151163/">seem longer</a>.</p> <p>Morticians are well aware of this phenomenon and some <a href="https://www.adomonline.com/mortuary-man-reveals-how-he-handles-nails-of-the-dead/?t">inject tissue filler</a> into the deceased’s fingertips to minimise this effect.</p> <p>So, it seems that living or dead, there is no escape from the never-ending task of caring for our hair and nails.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241556/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/michelle-moscova-310728">Michelle Moscova</a>, Adjunct Associate Professor, Anatomy, <a href="https://theconversation.com/institutions/unsw-sydney-1414">UNSW Sydney</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/why-do-some-peoples-hair-and-nails-grow-quicker-than-mine-241556">original article</a>.</em></p> </div>

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Most adults will gain half a kilo this year – and every year. Here’s how to stop ‘weight creep’

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/nick-fuller-219993">Nick Fuller</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a></em></p> <p>As we enter a new year armed with resolutions to improve our lives, there’s a good chance we’ll also be carrying something less helpful: extra kilos. At least half a kilogram, to be precise.</p> <p>“Weight creep” doesn’t have to be inevitable. Here’s what’s behind this sneaky annual occurrence and some practical steps to prevent it.</p> <h2>Small gains add up</h2> <p>Adults <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3151731/">tend to gain weight</a> progressively as they age and typically gain an average of <a href="https://pubmed.ncbi.nlm.nih.gov/23638485/">0.5 to 1kg every year</a>.</p> <p>While this doesn’t seem like much each year, it amounts to 5kg over a decade. The slow-but-steady nature of weight creep is why many of us won’t notice the extra weight gained until we’re in our fifties.</p> <h2>Why do we gain weight?</h2> <p>Subtle, gradual lifestyle shifts as we progress through life and age-related biological changes cause us to gain weight. Our:</p> <ul> <li> <p>activity levels decline. Longer work hours and family commitments can see us become more sedentary and have less time for exercise, which means we burn fewer calories</p> </li> <li> <p>diets worsen. With frenetic work and family schedules, we sometimes turn to pre-packaged and fast foods. These processed and discretionary foods are loaded with hidden sugars, salts and unhealthy fats. A better financial position later in life can also <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/j.1467-789X.2011.00953.x">result in more dining out</a>, which is associated with a higher total energy intake</p> </li> <li> <p>sleep decreases. Busy lives and screen use can mean we don’t get enough sleep. This disturbs our body’s energy balance, increasing our <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945708700133">feelings of hunger</a>, triggering cravings and decreasing our energy</p> </li> </ul> <ul> <li> <p>stress increases. Financial, relationship and work-related stress increases our body’s production of cortisol, triggering food cravings and promoting fat storage</p> </li> <li> <p>metabolism slows. Around the age of 40, our muscle mass naturally declines, and our body fat starts increasing. Muscle mass helps determine our metabolic rate, so when our muscle mass decreases, our bodies start to burn fewer calories at rest.</p> </li> </ul> <p>We also <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2807660">tend to gain a small amount</a> of weight during festive periods – times filled with calorie-rich foods and drinks, when exercise and sleep are often overlooked. <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2807660">One study of Australian adults</a> found participants gained 0.5 kilograms on average over the Christmas/New Year period and an average of 0.25 kilograms around Easter.</p> <h2>Why we need to prevent weight creep</h2> <p>It’s important to prevent weight creep for two key reasons:</p> <p><strong>1. Weight creep resets our body’s set point</strong></p> <p>Set-point theory suggests we each have a predetermined weight or set point. Our body works to <a href="https://theconversation.com/whats-the-weight-set-point-and-why-does-it-make-it-so-hard-to-keep-weight-off-195724">keep our weight around this set point</a>, adjusting our biological systems to regulate how much we eat, how we store fat and expend energy.</p> <p>When we gain weight, our set point resets to the new, higher weight. Our body adapts to protect this new weight, making it challenging to lose the weight we’ve gained.</p> <p>But it’s also possible to <a href="https://theconversation.com/whats-the-weight-set-point-and-why-does-it-make-it-so-hard-to-keep-weight-off-195724">lower your set point</a> if you lose weight gradually and with an interval weight loss approach. Specifically, losing weight in small manageable chunks you can sustain – periods of weight loss, followed by periods of weight maintenance, and so on, until you achieve your goal weight.</p> <p><strong>2. Weight creep can lead to obesity and health issues</strong></p> <p>Undetected and unmanaged weight creep <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5817436/">can result in</a> obesity which can increase our risk of heart disease, strokes, type 2 diabetes, osteoporosis and several types of cancers (including breast, colorectal, oesophageal, kidney, gallbladder, uterine, pancreatic and liver).</p> <p>A <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5817436/">large study</a> examined the link between weight gain from early to middle adulthood and health outcomes later in life, following people for around 15 years. It found those who gained 2.5 to 10kg over this period had an increased incidence of type 2 diabetes, heart disease, strokes, obesity-related cancer and death compared to participants who had maintained a stable weight.</p> <p>Fortunately, there are steps we can take to build lasting habits that will make weight creep a thing of the past.</p> <h2>7 practical steps to prevent weight creep</h2> <p><strong>1. Eat from big to small</strong></p> <p>Aim to consume most of your food earlier in the day and taper your meal sizes to ensure dinner is the smallest meal you eat.</p> <p>A low-calorie or small breakfast <a href="https://pubmed.ncbi.nlm.nih.gov/32073608/">leads to increased feelings of hunger</a>, specifically appetite for sweets, across the course of the day.</p> <p>We burn the calories from a meal <a href="https://pubmed.ncbi.nlm.nih.gov/32073608/">2.5 times more efficiently</a> in the morning than in the evening. So emphasising breakfast over dinner is also good for weight management.</p> <p><strong>2. Use chopsticks, a teaspoon or an oyster fork</strong></p> <p>Sit at the table for dinner and use different utensils to encourage eating more slowly.</p> <p>This gives your brain time to recognise and adapt to signals from your stomach <a href="https://pubmed.ncbi.nlm.nih.gov/28718396/">telling you you’re full</a>.</p> <p><strong>3. Eat the full rainbow</strong></p> <p>Fill your plate with vegetables and fruits of different colours first to support eating a high-fibre, nutrient-dense diet that will keep you feeling full and satisfied.</p> <p>Meals also need to be balanced and include a source of protein, wholegrain carbohydrates and healthy fat to meet our dietary needs – for example, eggs on wholegrain toast with avocado.</p> <p><strong>4. Reach for nature first</strong></p> <p>Retrain your brain to rely on nature’s treats – fresh vegetables, fruit, honey, nuts and seeds. In their natural state, these foods release the same pleasure response in the brain as ultra-processed and fast foods, helping you avoid unnecessary calories, sugar, salt and unhealthy fats.</p> <p><strong>5. Choose to move</strong></p> <p>Look for ways to incorporate incidental activity into your daily routine – such as taking the stairs instead of the lift – and <a href="https://theconversation.com/does-exercise-help-you-lose-weight-198292">boost your exercise</a> by challenging yourself to try a new activity.</p> <p>Just be sure to include variety, as doing the same activities every day often results in boredom and avoidance.</p> <p><strong>6. Prioritise sleep</strong></p> <p>Set yourself a goal of getting a minimum of <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945708700133">seven hours of uninterrupted sleep</a> each night, and help yourself achieve it by <a href="https://www.nature.com/articles/ncomms3259">avoiding screens</a> for an hour or <a href="https://journals.sagepub.com/doi/abs/10.1177/1477153515584979?journalCode=lrtd">two</a> before bed.</p> <p><strong>7. Weigh yourself regularly</strong></p> <p>Getting into the habit of weighing yourself weekly is a guaranteed way <a href="https://theconversation.com/how-often-should-you-really-weigh-yourself-223864">to help avoid the kilos creeping up</a> on us. Aim to weigh yourself on the same day, at the same time and in the same environment each week and use the best quality scales you can afford.</p> <hr /> <p><em>At the Boden Group, Charles Perkins Centre, we are studying the science of obesity and running clinical trials for weight loss. <a href="https://redcap.sydney.edu.au/surveys/?s=RKTXPPPHKY">You can register here</a> to express your interest.</em><!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/244186/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/nick-fuller-219993">Nick Fuller</a>, Clinical Trials Director, Department of Endocrinology, RPA Hospital, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/most-adults-will-gain-half-a-kilo-this-year-and-every-year-heres-how-to-stop-weight-creep-244186">original article</a>.</em></p> </div>

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There’s a link between walking speed and ageing well. Here’s how you can improve your pace

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/andres-rafales-perucha-1528635"><em>Andrés Ráfales Perucha</em></a><em>, <a href="https://theconversation.com/institutions/universidad-san-jorge-5704">Universidad San Jorge</a> and <a href="https://theconversation.com/profiles/pablo-gargallo-aguaron-1528652">Pablo Gargallo Aguarón</a>, <a href="https://theconversation.com/institutions/universidad-san-jorge-5704">Universidad San Jorge</a></em></p> <p>For decades, we have known that the way you walk, in particular your walking speed, is tied to your health. One study has even proposed that it be considered <a href="https://pubmed.ncbi.nlm.nih.gov/24812254/">a vital sign</a>, much like heart rate and blood pressure.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/26861693/">Various studies</a> have found a link between low walking speed in adults over 65 and a greater risk of cognitive impairment, cardiovascular disease, falls (which could lead to fractures), hospitalisation, and even an increased overall mortality rate.</p> <p>A higher walking speed, on the other hand, is associated with increased functional capacity, meaning a better ability to move around and do activities independently. It is also linked to <a href="https://www.thelancet.com/journals/lanhl/article/PIIS2666-7568(24)00092-8/fulltext">greater longevity</a>.</p> <p>But how fast should you walk? <a href="https://www.sciencedirect.com/science/article/abs/pii/S1568163714000646?dgcid=api_sd_search-api-endpoint">Studies</a> recommend a few simple tests, which principally consist of timing how long it takes a person to walk between two points at their usual pace.</p> <p>This <a href="https://www.physio-pedia.com/4_Metre_Walk_Test">test</a> is done over a distance of four metres. A speed of under 0.8 metres per second is associated with a greater risk of frailty.</p> <h2>How to improve walking speed</h2> <p>While there is slight disagreement as to the best exercise for increasing walking speed, the pattern that seems most effective is <a href="https://pubmed.ncbi.nlm.nih.gov/34409961/">multicomponent training</a>, which includes several different forms of exercise:</p> <ol> <li> <p><strong>Balance exercises</strong> can help improve stability and prevent falls. Examples include walking in a straight line putting one foot in front of the other, or standing on one leg, alternating every 10-15 seconds.</p> </li> <li> <p><strong>Flexibility exercises</strong> can improve mobility and reduce risk of injury. The benefits of movement in alleviating back pain are <a href="https://theconversation.com/back-pain-why-exercise-can-provide-relief-and-how-to-do-it-safely-162888">well documented</a>.</p> </li> <li> <p><strong>Muscular exercises</strong> help build strength in the legs, buttocks and other body areas. These can be as straightforward as standing up and sitting down in a chair.</p> </li> <li> <p><strong>Aerobic exercise</strong> improves stamina, and can include walking itself, or <a href="https://theconversation.com/seven-reasons-nordic-walking-is-better-for-you-than-the-normal-kind-187391">Nordic walking</a> (with hiking poles).</p> </li> </ol> <h2>How much aerobic exercise do we need?</h2> <p>The main <a href="https://www.who.int/publications/i/item/9789240014886">guides</a> on physical activity recommend that, provided they are physically and medically able, each adult should do at least 150 minutes of moderately intense aeoribic exercise per week.</p> <p>“Moderate” means you are not too out of breath to hold a conversation, but enough to notice an increased heart and breathing rate. There are few reasons not to do this kind of exercise, and it is beneficial for people with chronic illnesses, including cardiovascular issues, metabolic conditions, or even cancer.</p> <h2>Muscle strength: How, and how much?</h2> <p>Strengthening exercises have traditionally been recommended 2 to 3 times a week, with at least one set per exercise session of the main muscle groups: legs, buttocks, pectorals, back and arms.</p> <p>However, more recent studies suggest that doing less intense but more frequent strengthening exercises may be an effective way to <a href="https://pubmed.ncbi.nlm.nih.gov/34822137/">maintain muscle mass and strength</a>. This would mean doing them almost every day, including even small exercise “snacks” throughout the day.</p> <h2>Use it or lose it</h2> <p>If we don’t train them, muscle mass and strength decrease over time. This not only affects our mobility, but also increases the risk of health problems and even death. A little daily exercise can make a big difference. We therefore recommend that you try to maintain your physical condition as much as possible, both to improve your immediate health and prevent future problems.</p> <p>If you do not know where to start, the best option is always to consult a professional. If you have difficulties or limitations in exercising, a physiotherapist can help you to build a specialised exercise plan, or can adapt one to your needs.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/245880/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/andres-rafales-perucha-1528635">Andrés Ráfales Perucha</a>, Fisioterapeuta y Personal Docente e Investigador de la Universidad San Jorge. Miembro del grupo de investigación UNLOC., <a href="https://theconversation.com/institutions/universidad-san-jorge-5704">Universidad San Jorge</a> and <a href="https://theconversation.com/profiles/pablo-gargallo-aguaron-1528652">Pablo Gargallo Aguarón</a>, Personal Docente e Investigador en Fisioterapia, <a href="https://theconversation.com/institutions/universidad-san-jorge-5704">Universidad San Jorge</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/theres-a-link-between-walking-speed-and-ageing-well-heres-how-you-can-improve-your-pace-245880">original article</a>.</em></p> </div>

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What is reformer pilates? And is it worth the cost?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/hunter-bennett-1053061">Hunter Bennett</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a>; <a href="https://theconversation.com/profiles/jacinta-brinsley-1419359">Jacinta Brinsley</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a>, and <a href="https://theconversation.com/profiles/lewis-ingram-1427671">Lewis Ingram</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p>Reformer pilates is <a href="https://www.globenewswire.com/news-release/2024/10/18/2965312/0/en/Pilates-Reformer-Market-Set-to-Reach-USD-11-848-3-Million-by-2031-Driven-by-Growing-Health-Awareness-and-Advancements-in-Portable-Equipment-FMI.html#:%7E:text=Key%20Takeaways%3A,8.2%25%20over%20the%20forecast%20period.">steadily growing in popularity</a>, with new studios opening regularly in major cities all over the world.</p> <p>But what exactly is reformer pilates? And how does it compare with regular pilates and other types of exercise?</p> <p>Classes aren’t cheap so let’s look at the potential benefits and drawbacks to help you decide if it’s right for you.</p> <h2>Pilates with special equipment</h2> <p>Pilates is a <a href="https://www.sciencedirect.com/science/article/abs/pii/S1360859201902372">mode of exercise</a> that focuses on core stability and flexibility, while also addressing muscular strength and endurance, balance and general fitness. At first glance, it might look a bit like yoga, with some more traditional weight training components thrown in.</p> <p>Reformer pilates uses a piece of equipment called a “reformer”. This looks like a narrow bed that slides along a carriage, has straps to hold onto, and has adjustable springs that add resistance to movement. You perform pilates on the reformer to target specific muscle groups and movement patterns.</p> <p>The reformer was first designed to help <a href="https://www.taylorfrancis.com/chapters/edit/10.4324/9781003524625-19/pilates-rehabilitation-brent-anderson">people recover from injuries</a>. However, it has now become common for general fitness and even <a href="https://journals.sagepub.com/doi/epdf/10.1177/1089313X06010003-406">sports performance</a>.</p> <p>Unlike normal pilates, also known as “mat pilates”, which only uses your body weight, the reformer adds resistance, meaning you can change the difficulty according to your current level of fitness.</p> <p>This not only provides a way to overload your muscles, but can make the exercise session more aerobically demanding, which has been proposed to <a href="https://figshare.utas.edu.au/articles/journal_contribution/Equipment-based_pilates_induces_a_cardiovascular_response_in_older_adults_an_observational_clinical_trial/22943213?file=40678763">improve cardiovascular fitness</a>.</p> <h2>What are the benefits of reformer pilates?</h2> <p>Despite being around for decades, there is surprisingly little research looking at the benefits of reformer pilates. However, what we have seen so far suggests it has a similar effect to other modes of exercise.</p> <p>Reformer pilates has been shown to help with <a href="https://files.eric.ed.gov/fulltext/EJ1250306.pdf">weight loss</a>, cause some <a href="https://www.tandfonline.com/doi/full/10.1080/03630242.2015.1118723?casa_token=weWacL5JmM8AAAAA%3AjlXtB-o29eDTHNegdvvfxa9FUT1iY18T0niXDdDpzgbn9AhMK4fgF1RQWLwyo3tVic49h9vhH4Ux">small increases in muscle mass</a>, and enhance <a href="https://www.sciencedirect.com/science/article/pii/S1360859224004558?casa_token=rEKoc-x8WoMAAAAA:Zvgqtp7SPNbWoTtxRb8-x5HCy0XD2M74Ky-7bBU2yFgGMOnyw2aJQDKCdep40AqRobWgR0V3yA">cognitive function</a>. All of these benefits are commonly seen when combining weight training and cardio into the same routine.</p> <p>Similarly, among <a href="https://www.sciencedirect.com/science/article/abs/pii/S1360859217302280?casa_token=txnU400G7DQAAAAA:KQLBRYBWuZ0asqaOJ4agUKZj2nFljuxFvCQFZeZQh53h0ZIp07qJ_4TuyCQto4c-BB1kzMpWug">older adults</a>, it has been shown to improve strength, enhance flexibility and may even reduce the risk of falling.</p> <p>From a rehabilitation perspective, there is some evidence indicating reformer pilates can improve <a href="https://www.sciencedirect.com/science/article/pii/S1360859216300857?casa_token=tQyxWGoPam8AAAAA:jlIpAr2ZuD3bjKKtT4qHbDz2dr_Tm2k4Cgb22qw_NQRb5gtLsJdYV7P0DuRlVWN04kI9p_dSOQ">shoulder health and function</a>, reduce <a href="http://www.jkspm.org/journal/view.html?uid=1105&amp;&amp;vmd=Full">lower back pain</a> and <a href="https://ksep-es.org/journal/view.php?number=1084">increase flexibility</a>.</p> <p>Finally, there is some evidence suggesting a single session of reformer pilates can improve two key markers of <a href="https://karger.com/ger/article-abstract/70/7/764/906990/Effect-of-60-Min-Single-Bout-of-Resistance">cardiovascular health</a>, being flow-mediated dilation and pulse wave velocity, while also <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9098105/">improving cholesterol and insulin levels</a>. This suggests reformer pilates could lead to long-term improvements in heart and metabolic health, although more research is needed to confirm this.</p> <p>However, there are some key things to consider when discussing these benefits. Most of this research is quite exploratory and comes from a very small number of studies. So we do not know whether these findings will apply to everyone.</p> <p>Very few studies compared reformer pilates to other types of exercise. Therefore, while it can improve most aspects of health and function, it’s unlikely reformer pilates provides the <em>optimal</em> mode of exercise for each individual component of physical fitness.</p> <p>Traditional weight training, for example, will likely cause larger improvements in strength than reformer pilates. Similarly, stretching will <a href="https://theconversation.com/new-research-shows-how-long-hard-and-often-you-need-to-stretch-to-improve-your-flexibility-242488">probably make you more flexible</a>. And running or cycling will make you fitter.</p> <p>However, if you want a type of exercise that gives you broad overall health benefits, it could be a good option.</p> <h2>What are the downsides of reformer pilates</h2> <p>Reformer pilates is not for everyone.</p> <p>First and foremost, classes can be expensive compared to other fitness options. You need to be doing at least two to three sessions per week of any type of exercise to <a href="https://www.who.int/publications/i/item/9789240015128">maximise the benefits</a>. So even if you can find a class for A$20 or $30, paying for two or three classes a week (or buying a weekly or monthly subscription) is a significant outlay.</p> <p>Second, it’s not as accessible as other exercise. Even if you can afford it, not every town or suburb has a reformer pilates studio.</p> <p>Third, the effectiveness of your workout is likely to be impacted by how competent your instructor is. There are a host of different pilates qualifications you can get in Australia, and some take much less time than others. With this in mind, it might be best to look for <a href="https://www.pilates.org.au/about/">accredited pilates instructors</a>, although this will further reduce the number of options you have available.</p> <p>Finally, there is a learning curve. While you will get better over time, the exercise will likely be less effective during those first few weeks (or months) when you are getting used to the machine and the movements.</p> <h2>Is it right for you?</h2> <p>Reformer pilates can be a great addition to your fitness routine, especially if you’re looking for a low-impact way to build strength and flexibility.</p> <p>But if you have more specific goals, you might need a more specific mode of exercise. For example, if you need to get stronger to improve your ability to manage your daily life, then strength training is probably your best bet. Likewise, if your goal is to run a marathon, you will get more specific benefits from running.</p> <p>The cost and availability of reformer pilates make it less accessible for some people. With this in mind, if you are after similar benefits at a lower price point, mat pilates might be a better option. Not only does it have evidence suggesting it can improve <a href="https://journals.lww.com/ajpmr/FullText/2018/06000/Effects_of_Mat_Pilates_on_Physical_Functional.6.aspx?casa_token=7s6iayoW_s4AAAAA:ajVm-FSTsMeUsuUVH4fpv63bQb_eN0DgduCw7K83K4IlJ3OSQyNKCeoWb_tQZhEV3dRDa3dXwPYE7euORvMAwLM&amp;casa_token=zUcAB1qT0a4AAAAA:KpwLVGmBXbLo0es1xEBF7SAJPIBy6mKoVzCWOLiFFHAnn4LbGHA3febsR9jhygDyNsNnobmKM2ukMJNPGixdypY">strength and fitness</a>, but it is something you can do at home if you find a good resource (<a href="https://www.youtube.com/watch?v=44HquH6QyXc">YouTube</a> could be a good starting point here).<!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/hunter-bennett-1053061">Hunter Bennett</a>, Lecturer in Exercise Science, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a>; <a href="https://theconversation.com/profiles/jacinta-brinsley-1419359">Jacinta Brinsley</a>, Exercise Physiologist and Postdoctoral Researcher in the Alliance for Research in Nutrition, Exercise and Activity, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a>, and <a href="https://theconversation.com/profiles/lewis-ingram-1427671">Lewis Ingram</a>, Lecturer in Physiotherapy, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-is-reformer-pilates-and-is-it-worth-the-cost-244634">original article</a>.</em></p> </div>

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