For how we live.
Service journalism, wearables, habits, and claims worth testing.
Visceral fat packed around the organs tends to be shed preferentially with modest weight loss. What lingers is subcutaneous fat — and you cannot choose where it comes off, which is what makes the belly feel stubborn.
A short walk after eating blunts the post-meal blood-sugar spike. Trials in people with type 2 diabetes and in healthy adults agree, and light walking beats standing, which beats sitting still.
Sea moss is sold as a 92-mineral cure-all, but no human trial shows it delivers those benefits — and because seaweed's iodine content is wildly variable, the documented risk falls on the thyroid.
Two blinded randomised trials found magnetic wrist straps and copper bracelets worked no better than dummy versions for arthritis pain. The reported relief looks like a placebo effect.
US regulators class MSG as generally recognised as safe, and when the symptoms are tested under blinded conditions they largely disappear. The clearest signal is a nocebo effect, not the additive.
Short trials show topical hyaluronic acid improves skin hydration and, in low-molecular-weight forms, wrinkle depth. It is a humectant on the surface, not a replacement for the acid skin loses with age.
The popular 21-day rule has no basis in the habit-formation research. In the one real-world study, the time to reach automatic behaviour ranged from 18 to 254 days — and plateaued on average near 66.
Wellness marketing says reconnecting to the Earth's electrons lowers cortisol, inflammation and pain. The human studies are small, mostly unblinded, and largely produced by the idea's own advocates.
Greens powders are sold as insurance against a poor diet. There are almost no independent trials of the products themselves — and the strong evidence is for eating vegetables, not drinking them.
Loading up on dietary fibre is the rare viral trend with strong data behind it: high-fibre eaters have markedly lower mortality. But the evidence is for whole foods, not powders, and tracks a habit, not a one-day stunt.
No. Sweat is how the body sheds heat, not fat. The weight lost in a hot workout or a sauna is water, and it comes back the moment you rehydrate.
You cannot burn fat off a specific area by exercising it. When researchers trained a single limb or drilled abdominal muscles for weeks, fat came off the body generally, not the spot being worked.
Short sleep is tied to obesity, and experiments suggest the link is partly causal. Adults told to sleep longer ate about 270 fewer calories a day; dieters who slept less lost far less of their weight as fat.
Two meta-analyses of 104 trials found music lowered both felt stress and physical markers like heart rate. The effect is consistent and moderate — larger for how stressed people feel than for blood pressure.
Early studies made elderberry look promising for colds, and sales topped $100 million. But the trials are small, and the most rigorous one — a randomised flu trial in emergency patients — found no benefit at all.
Echinacea is a pharmacy staple every winter. But a Cochrane review of 24 trials found no reliable treatment benefit, and the largest trial shaved barely half a day off a cold — a difference too small to be sure was real.
No trial shows chicken soup cures or shortens a cold. But two small, decades-old studies found it clears nasal mucus faster than plain hot water and calms one inflammatory cell in the lab — a case for comfort, not cure.
In a driving study, 200 mg of caffeine followed by a nap under 15 minutes cut simulator incidents to 9% of placebo levels, against 34% for caffeine alone. The order is the point.
Standing up every half hour is common desk advice. A meta-analysis of seven trials found brief standing breaks trim post-meal glucose a little, but short light-walking breaks cut both glucose and insulin far more.
Barely, and some carry real risk. Caffeine has a small, measurable effect; the other headline 'thermogenic' ingredients mostly don't, and high-dose green tea extract has caused liver injury.
TikTok says a castor oil pack on the abdomen detoxes the liver, balances hormones and melts bloating. The oil's only proven action is as a laxative when swallowed — not soaked in through skin.
You cannot turn a healthy immune system up like a dial, and nothing on the supplement shelf has been shown to. What the trials do show is narrower: fix a sleep deficit and you catch fewer colds.
Topical vitamin C is a real antioxidant that helps skin build collagen. Split-face studies show measurable smoothing, but a systematic review found only seven usable trials, almost all mixing it with other actives.
Surveys have flagged lead, cadmium and arsenic in some powders, but a risk assessment of those same numbers found typical intakes stayed below the thresholds used to judge harm.
Omega-3 supplements are widely recommended for dry eye, but the largest randomised trial found them no better than an olive-oil placebo. A Cochrane review leaves the case uncertain at best.
For hay fever and year-round allergy, the pill most people reach for is not the strongest option. A meta-analysis found steroid nasal sprays beat oral antihistamines across nasal symptoms — most of all a blocked nose.
Short courses look well tolerated, but trials rarely run past a few weeks, so long-term safety is untested. Two clearer problems: variable supplement content, and a surge in children's accidental ingestions.
Percussive devices reliably loosen muscles and add short-term flexibility, but pooled trials show no clear gain for maximal-strength recovery or next-day soreness — and they can dent explosive output before training.
Writing about your thoughts and feelings has a real but small average effect across 146 trials; a web-based journaling study eased anxiety in medical patients. Useful, not a cure.
The reheating is not the hazard. Cooked rice left to cool slowly at room temperature is, because a spore-forming bacterium can build a heat-stable toxin that a second heating will not undo.
The advice to lose weight slowly assumes fast loss is regained faster. Two randomised trials found the rate barely affects long-term regain — though rapid loss can cost more lean mass and carries its own risks.
In people who are iron-deficient without anaemia, supplements ease self-reported fatigue in trials — but do nothing for objective exercise capacity, and the benefit hinges on being iron-deficient, not just tired.
Rubbing ice on your face constricts vessels for a moment, but a controlled cold study found lower skin hydration and more redness, not firmer skin — and prolonged cold makes vessels reopen.
Products promising to 'balance your hormones' lean on botanicals like maca, black cohosh and phytoestrogens, and on the hormone DHEA. When those ingredients are put in controlled trials, the evidence is limited or null.
Exercising before breakfast shifts which fuel your body uses during the session, but pooled trials find no meaningful edge for weight or body-fat loss over the same workout done fed.
Reading in poor light makes eyes feel tired, but there is no evidence it causes lasting damage. What really shapes eyesight is near-work load and time in bright daylight — and it acts in childhood.
Walking pads promise movement without leaving your desk. A trial found walking while working slowed typing but did not harm cognition; a second found hourly walking cut post-meal glucose and blood pressure.
A JAMA Dermatology review found the best-evidenced products — Viviscal, Nutrafol and a few others — but flagged weak studies and industry funding. For people who eat normally, the case is thin.
For most people eating normally, added electrolytes do little, and plain water rehydrates fine for ordinary exercise. The clearest endurance danger is drinking too much — and the proven use is illness, not the gym.
For a healthy adult an occasional can is unlikely to harm. But in a randomised trial, 32 ounces raised blood pressure and prolonged the heart's QT interval more than placebo — and paediatricians say no to children.
Two things you do in bed have randomised evidence for nocturnal reflux: raising the head of the bed cut acid exposure from 21% to 15%, and a device that kept people on their left side nearly doubled treatment success.
The trials behind facial masks are small, brief and mostly run by the products' makers. They can show a real hydration and comfort effect — but not the lasting anti-ageing results on the packaging.
A cough that outlasts the cold is normal: studies put the average at more than two weeks. Little in the pharmacy reliably shortens it, and antibiotics do not — but some symptoms are a reason to see a doctor.
A split-face melasma trial put niacinamide within reach of prescription hydroquinone with fewer side effects. But much of the anti-ageing evidence comes from the ingredient's own manufacturers.
Across 23 cohort studies and 441,199 people, large weight fluctuation was linked to a 41% higher risk of death. Whether the cycling itself does harm, or reflects who cycles, the data cannot fully separate.
Plain fizzy water hydrates about as well as still water and is far less corrosive to teeth than juice or soft drinks. The cautions are narrow: flavoured versions and cola, not carbonation itself.
Air-popped popcorn is a whole grain, high in fibre and low in fat — a legitimately good snack. What turns it unhealthy is butter, oil, salt and portion size, not the corn itself.
Topical retinol is the over-the-counter cousin of prescription tretinoin. In the cleanest test of the pure ingredient, three-times-a-week retinol beat its own vehicle on fine wrinkles and built new collagen — slowly.
Pooled randomised trials show caffeine pushes blood pressure up sharply in the hour after a dose. But when the caffeine arrives as coffee, and over weeks rather than minutes, the effect shrinks toward nothing.
For people whose pancreas cannot make enzymes, replacement therapy is proven in randomised trials. For healthy people with bloating, the flagship study is a single-arm survey of customers who bought the product online.
TikTok's 'liquid gold' is real cow's first-milk, rich in antibodies and growth factors. But the robust human evidence sits in specific gut conditions, not the immunity, skin and hair benefits sold to healthy adults.
'Natural', 'clean' and 'organic' have no agreed regulatory meaning on a cosmetic label, and some plant-derived and fragrance ingredients are among the most common triggers of allergic skin reactions.
The beauty claims for silk pillowcases — fewer wrinkles, less acne, smoother hair — have no direct trials behind them. The most rigorous test of silk fabric on skin, in eczema, found it added nothing.
The dripping-mucus feeling is one of the commonest causes of a lingering cough. What clears it depends on the cause — and for allergy, steroid sprays beat antihistamine pills for the drip itself.
The trials that licensed minoxidil ran for 24 to 48 weeks, and a five-year follow-up shows why the honest answer to 'when can I stop' is: you probably can't without losing the gain.
The advice to look 20 feet away for 20 seconds every 20 minutes is everywhere. A two-week trial in symptomatic computer users found it cut eye-strain and dry-eye symptoms, but changed no measurable sign of eye health.
Chronic stress is linked to weight gain, and cortisol is one plausible route. But the measured associations are modest, and cortisol is a contributor, not the master switch that supplement marketing implies.
A nine-man study found hair fibres thickened from 0.085 to 0.092 mm after 24 weeks of daily massage. The larger dataset was a self-reported survey — run by a hair-loss website.
Told to cut fat or cut carbs, dieters in a 609-person Stanford trial lost 5.3 versus 6.0 kg over a year — a 0.7 kg gap. An 811-person trial agreed: the calorie deficit, not the macronutrient ratio, drives weight loss.
In a study of 633 people with gout, eating cherries over two days was linked to a 35% lower risk of a flare. It is suggestive, observational evidence — no randomised trial has yet confirmed it.
A varied diet covers most of the 13 essential vitamins. The evidence-based exceptions are specific: vitamin D is hard to get from food, older adults and vegans need B12, and folic acid is advised before pregnancy.
A randomised trial found ordinary ibuprofen cut acute mountain sickness from 69% to 43% on a fast ascent. A Cochrane review found most supplements and pre-acclimatisation gadgets do not hold up.
Red-light masks and panels promise photorejuvenation without lasers or needles. A randomised trial of 136 volunteers backs the collagen claim — but it is one good study, and 'red light' covers very different devices.
Saline nasal irrigation has better evidence than most self-care remedies: trials support it for chronic sinus and hay-fever symptoms, and a pilot found it shortened colds. The catch is that the quality is low.
A high number does buy measurably more protection — in one real-use trial far fewer people burned on the SPF 100 side. But how much you apply, and whether you reapply, moves the needle more than the label.
A BMI over 30 flagged obesity in 19.1% of US men, but measured body fat found it in 43.9%. A 58-expert Lancet commission now says BMI alone should not diagnose obesity in an individual.
Warm steam feels good on a blocked nose, but the randomised evidence for heated, humidified air treating a cold shows no clear benefit. A humidifier is comfort, not cure — and a dirty one carries its own risk.
A head-to-head trial found both tools nudged facial measurements over eight weeks, but the effects were small, mechanical and short-lived. There is no evidence they 'sculpt' the face or drain toxins.
True dietary magnesium shortage in healthy people is rare, and reference guidance does not currently advise supplements. The clear deficiencies come from illness, alcohol and certain drugs, not a missed daily pill.
Dandruff is the mild end of seborrhoeic dermatitis, and Cochrane reviews of that condition back the medicated-shampoo ingredients: ketoconazole and ciclopirox clear flaking better than placebo.
The warning that olive oil's low smoke point makes it unsafe to fry with is largely wrong. Oxidative stability, not smoke point, is what matters, and olive oil is among the more heat-resistant common oils.
A 2025 meta-analysis of 10 trials found small, short-term reductions in weight and BMI — but the studies were heterogeneous, and the viral single trial that fuelled the hype is one small study, not a settled result.
The popular claim is that a shot before meals fires up digestion. The controlled measurement shows vinegar slows the stomach down — helpful for blood sugar, unhelpful if you already digest slowly.
On ten monitored flights, passengers away from a sick traveller faced low transmission risk, and every air sample tested negative for common viruses. Measles is the exception that proves the rule.
Six years after 'The Biggest Loser', contestants had regained most of the weight — and their resting metabolism was still running 500 calories a day slower than expected. The diet triggers a defence that outlasts it.
Classic B12 deficiency is relatively uncommon, but it clusters: in people over 50 whose absorption fails, in vegans whose intake does, and around metformin, acid-lowering drugs and stomach surgery.
A 2019 pooling of 12 trials rated peppermint oil safe and effective for IBS, with a number-needed-to-treat of three. The largest, most rigorous trial then missed its primary endpoint against placebo.
Manual lymphatic drainage is a real physiotherapy for swelling after breast-cancer treatment, where trials show modest, mixed benefit. For 'detoxing' or slimming a healthy body there is no evidence.
The belief that a razor makes hair return coarser, faster or darker is one of medicine's durable myths. Controlled studies going back decades find no change in thickness, colour or growth rate.
Colder days track with more heart attacks in nationwide data, and the sharpest signal is the day after heavy snowfall — a rise seen in men but not women, pointing to the shovel as much as the temperature.
A harmonised meta-analysis of over a million adults found 60 to 75 minutes of daily moderate activity erased the extra death risk tied to sitting more than eight hours. The catch is how much activity that is.
Every documented case of biotin helping hair involved a deficiency. In people who are not deficient the evidence is absent — and high-dose supplements can skew blood tests, including a heart-attack marker.
Real deficiency shows as bone pain, muscle weakness or, in children, rickets. But US surveys suggest most people meet their needs, and both a 2011 and a 2024 review advise against routine testing in healthy adults.
For dry, eczema-prone skin and for shielding hair from wash damage, coconut oil has real randomised evidence behind it — narrow, not miraculous, and not the same claim as being good for every skin type.
For heat exhaustion, rest and shade usually suffice. For heat stroke, a meta-analysis of 63 studies found immersion in cold water cooled the body faster than anything passive — the intervention the evidence agrees on.
Narrative reviews call it promising for scars and wrinkles. A Cochrane review of 24 trials rated the controlled evidence very low quality — and home dermarollers add an infection risk clinics design out.
An unplanned cheat day can erase a week's calorie deficit and has no trial support. Structured diet breaks are different — one trial found they improved weight loss, though another found no body-composition edge.
A single randomised trial found rosemary oil and 2% minoxidil produced statistically indistinguishable hair counts at six months. It is the strongest evidence rosemary has — and it is thin.
A Mediterranean diet rich in extra-virgin olive oil cut cardiovascular events in a Spanish trial, and US cohorts link over half a tablespoon a day to less heart disease — the biggest signal in what it replaces.
In the one randomised trial to test it, adults who used sunscreen daily showed no detectable increase in skin ageing over 4.5 years — 24% less than those who used it as they pleased.
The old advice to buy the hardest mattress you can find is not what the trials show. A double-blind randomised trial and a systematic review both favour medium firmness.
The puffy 'cortisol face' and the 'cortisol cocktails' sold to fix it lean on 'adrenal fatigue' — a condition a systematic review of 58 studies found no evidence for. True cortisol excess is a diagnosable disease.
No cream, pill or gel reverses a sunburn or shortens it. Cool compresses, moisturizer and painkillers ease the days it lasts; the burn itself is UV damage that heals on its own.
Two randomised trials found a 500 ml glass of water before meals adds a modest extra loss — about 1.3 kg over 12 weeks in one. The effect is real but small, short-term, and no substitute for the diet itself.
A kilogram of muscle burns about 13 calories a day at rest — far less than the fitness-marketing figure implies. But resistance training does nudge resting metabolism up, by roughly 96 calories a day in a meta-analysis.
Started early and at high enough doses, zinc lozenges may cut a cold short by a day or two. But the evidence leans on a handful of small trials, formulation matters, and prevention claims are weaker.
Small trials suggest curcumin can modestly reduce arthritis pain, sometimes on par with painkillers — but the evidence is thin, and turmeric supplements are linked to a rising number of serious liver injuries.
Saving starch for the end of a meal reliably blunts the glucose rise afterwards in small trials — but the evidence is short-term, low-certainty, and silent on whether it changes long-term control.
Pooled trials show foam rolling briefly improves flexibility and eases muscle soreness, but its effects on strength, power and recovery are small to negligible — and the injury and 'fascia' claims are unsupported.
Pooled randomised trials show real improvements in skin hydration and elasticity versus placebo, but the effect is moderate, the measures are instrument readings, and the evidence base is shaky.
Randomised trials show lower self-reported stress and anxiety, but the certainty is low, the studies are small and wildly inconsistent, and a separate evidence strand flags liver and thyroid risks.
The oral decongestant in most cold and sinus tablets — phenylephrine — works no better than placebo, US regulators now say. Saline and short-term sprays do more.
Marketed as a natural weight-loss drug, berberine rests on small, mostly low-quality trials showing modest effects on blood sugar and cholesterol — with no weight-loss evidence to match the hype.
Some steps demonstrably lower the particles and chemicals you take in. Whether lowering them improves health is a question no study has yet answered.
Particles turn up across the food supply, and plastic tea bags shed billions per cup. The counts are real; whether these amounts affect health is unestablished.
The looksmaxxing ideal of deep-set, tilted eyes has driven interest in canthoplasty — real eyelid surgery with reconstructive origins, and a complication record when it goes wrong.
The trend treats the gut as a dashboard to be tuned with home tests, probiotics and 'gut-healing' protocols. The one intervention with the broadest evidence is the least sold: fibre.
A 2024 imaging method found roughly a quarter-million plastic particles per litre of bottled water, most of them nanoplastics — far more than older counts, and mostly unstudied.
The word covers everything from sunscreen to self-surgery. The low-risk end has real evidence behind it; the invasive end is where the harm sits, and the whole subculture carries a mental-health cost.
Microwaving food in some plastic containers releases far more particles than cold storage. What that means for health is still an open question of dose.
In 69 people across normal weight, overweight and type 2 diabetes, a stevia drink behaved like water — no shift in glucose, insulin, gut hormones, appetite or how much they ate next.
No- and low-alcohol drinks are the fastest-growing category in the drinks trade, and one in six Americans now reaches for them. Whether they cut real drinking, or simply add to it, is barely studied.
The training and creatine at its core rest on strong evidence. The supplement stack around them mostly doesn't — and the SARMs some users add are frequently not even the drug on the label.
In nearly 12,000 US children, tree and park cover was linked to sharper directed attention and higher crystallized intelligence — and cleaner air seemed to explain part of it.
A Swiss study tracking people who switched to remote work found no measurable change across 13 health outcomes. A review of pandemic homeworking found the relationship varies so much that no consensus emerged.
A Shanghai study of 3,032 couples measured nutrients before conception. Predicted birth-defect prevalence fell across maternal B12 levels — and, more weakly, across paternal ones.
A meta-analysis of 78 studies found the menstrual cycle has at most a trivial effect on performance. A randomised trial found timing strength training to cycle phase built no more muscle than training consistently.
A meta-analysis of 30 randomised trials found fibre supplements work in IBS, with the benefit concentrated in psyllium. Wheat bran was the most-studied type and did not carry the effect.
A cohort of 4,018 children found nearly half were picky at some point, but two-thirds remitted within three years and prevalence fell to 13.2% by age 6. About 4% stayed persistently picky.
The association was strongest where the air was worst — which is the tell. A parallel US survey finds the indoor facilities are the ones vanishing from low-income neighbourhoods.
Across 29 studies the overall effect on chronic back pain was not significant. Split by whether the current was strong enough to be clearly felt, one subgroup showed a large effect and the other none.
The famous cigarette comparison is a communications gloss on a robust but observational finding: people with stronger social ties are markedly more likely to survive follow-up.
A matched study compared recreational runners, non-runners and adults with obesity, one triplet at a time. The first two groups were indistinguishable on structure and function. The third was not.
A tightly controlled crossover trial found late eating increased hunger, cut waking energy expenditure and shifted fat-tissue gene expression. The population data show a 17% higher odds of obesity.
The human intestinal-permeability literature lists endurance exercise, NSAIDs, pregnancy and surfactants as stressors. Coffee is not on that list, and alcohol's case is largely inferred.
In 2,292 hip fractures across six cities in Nagano, snowfall raised the odds of admission — until the models adjusted for how cold it was, at which point the association disappeared.
A study estimated semaglutide's class could be produced for under $75 a month; it lists near $1,000. The gap is patent protection, and in the US it runs to 2032.
Consumer clocks report an age, an age gap or a pace of ageing. Expert panels agree no single biomarker is sufficient — and clocks have failed to move when an intervention demonstrably worked.
The share of US adults who drink has fallen to a record 54%, and for the first time a near-majority think a daily drink or two is bad for them. What is driving the sober-curious turn is less obvious than the trend.
Photobiomodulation raised skin temperature by 8 °C and left mitochondrial respiration exactly where it found it. Ketone esters across an eight-day stage race did nothing for performance, cognition or sleep.
A prospective study found that beginning intensive training before 27 months did not bring completion any sooner — and lengthened the process. Normal completion ages span well over a year.
A Cochrane review finds fixing home hazards reduces falls by 38% in people at high risk of falling — and not at all in those who are not. On vitamin D, the US task force is blunt: no benefit.
Across 34 trials, mindfulness apps produced small effects on stress, anxiety and depression, and none on general distress. A 2026 review confirms they can help without a facilitator — at low certainty.
Pooled across 216 participants, the devices beat control by 45.3% on inflammatory lesions. The trials are small, none of the devices tested is necessarily one now sold, and the market is barely regulated.
A UK survey of 26,322 urban adults finds a small but consistent life-satisfaction gain from neighbourhood greenery. A Stockholm study of 46,282 shows who ends up living without it.
A Lancet series covering 135 million person-years found the largest risk reductions in that range. Trials of isolated fibre supplements produce much smaller effects on much narrower outcomes.
Two meta-analyses tie an extra two cups a day to roughly a third lower risk of both liver cancer and cirrhosis, with decaf showing a smaller effect. It is all observational, and the evidence quality is graded very low.
Two large cohorts link purpose in life to lower mortality and lower Alzheimer's risk. Whether purpose protects health, or health sustains purpose, is what the studies cannot fully separate.
Appetite fades with age and malnutrition is common and under-screened. Supplement drinks produce small, real weight gains — and cut deaths mainly in those already undernourished, not everyone.
Alternating alcoholic and soft drinks is the tactic of the moment, but it has never been tested. A brief conversation with a clinician has, and it cuts drinking by about two drinks a week.
Participants on Magtein scored better on memory and reaction-time tests after six weeks. On sleep — the reason most people buy it — an Oura Ring found no measurable difference at all.
When a large firm moved everyone to a high-deductible plan, spending fell about 12-14%. The catch: people cut valuable and low-value care alike, and barely shopped on price.
In a study of 543,167 cycles, calendar-based apps misclassified a fertile day as safe in two-thirds of cycles. Apps that track a real biological signal do better, but plain calendar apps remain the most common kind.
A randomised trial gave one group unfiltered local honey and found no relief beyond placebo. A later trial found a benefit — using a dose of about 70 grams a day alongside an antihistamine.
OSHA and NIOSH use different rules for how fast allowable exposure falls as sound gets louder. WHO's venue standard permits an average of 100 decibels. The headline 'one billion at risk' figure is a modelled range.
A large trial in adults up to 89 found structured activity cut the risk of losing the ability to walk. In frail nursing-home residents near 90, strength training more than doubled muscle strength.
A Cochrane review of 251,891 participants found no effect on total, cancer or cardiovascular mortality, at high certainty for the first two. The finding is about check-ups, not about all screening.
The gap between those two numbers is the whole argument. An individual-patient meta-analysis of 20,827 people found real effects on both comparisons, and found that the choice of sham changed the answer.
Two ingredients carry most of the real evidence. The rest of the multi-step routine adds cost and, when actives are layered too hard, a damaged skin barrier.
A Copenhagen team has just published the protocol for the first study designed to test whether reducing PFAS exposure changes anything. That it is still a protocol tells you where the evidence stands.
A systematic review of 113 studies found real biology in NAD+ supplementation — and not one eligible human trial testing the IV or IM version clinics actually sell for anti-aging.
A review screening 14,125 articles found evidence neither for nor against morning or evening training — only that testing and training at the same hour helps. Evening sessions may cost some sleep continuity.
Cochrane reviews covering more than 19,000 participants found no reduction in cold incidence from regular vitamin C, a possible reduction in duration from zinc, and a clear increase in adverse events.
The FDA's threshold traces to a Health Canada assessment and a 2017 systematic review of 381 studies. It describes a population, not a person, and the variation between people is large.
A placebo-controlled trial in 164 children reduced fine particles 64% and found no improvement in symptoms. A smaller crossover trial found a benefit, but only in children whose asthma was poorly controlled.
Across 89,573 accelerometer-monitored adults and 678 conditions, no disease showed a significant difference between activity concentrated in one or two days and activity spread through the week.
A Cochrane review found sit-stand desks reliably reduce workplace sitting, but graded the evidence low quality and could not tie it to better health. WHO backs cutting sedentary time but set no number.
Bodybuilding steroids, green tea extract and multi-ingredient blends are the products most often implicated. A liver injury from a supplement often can't be traced to a single named ingredient.
GAIT randomised 1,583 people and found neither supplement beat placebo overall. A later network meta-analysis found effects below the clinically important threshold, and smaller still in industry-independent trials.
The scrotal-cooling theory is sound and the semen findings are real. A 2026 review found the prospective data show no difference in pregnancy outcomes by underwear type.
The fear that a high-protein diet damages normal kidneys is not supported by the trial evidence. Protein restriction is a therapy studied in people who already have kidney disease — a different question entirely.
Oil pulling and miswak have real short-term data on plaque and gum inflammation. Charcoal dentifrices have almost none, and a third of the products reviewed contained bentonite clay.
Three surveillance networks put 2025/26 effectiveness between 22% and 45% against a drifted H3N2 virus. The figure is a comparison between vaccinated and unvaccinated people who all got tested.
A 19-trial review of peptides prints two different wrinkle effect sizes in its own abstract. A vitamin C trial ran four weeks against retinol, with nothing inert to compare either of them against.
A systematic review of 43 studies judged cups a safe option, with leakage similar to or lower than pads and tampons. For the newer reusable products, published research is mostly about acceptability, not safety.
Serious contact-lens eye infections are uncommon in absolute terms, but overnight wear is the single largest modifiable risk factor. The rare cases can scar the cornea and cost vision.
In a free-living comparison, three devices counted steps within about 18% of a research monitor but one overestimated active-calorie burn by 139%. A lab study found step counts collapse when walking is slow.
The AAP advises room-sharing without bed-sharing. Pooled case-control data show bed-sharing raises SIDS risk — sharply when parents smoke or drink, and more modestly even when they do not.
A meta-analysis of 23 blinded studies found no effect on any of 14 behavioural and cognitive measures. A separate trial fed children extreme doses and found nothing. The belief survives anyway.
It found rising microbiome diversity and falling inflammatory markers in the fermented-food arm — and no change in its own primary outcome in the high-fibre arm it was compared against.
Falls are the leading injury killer of older adults. The intervention with the strongest evidence is unglamorous — exercise that trains balance, gait and strength — and the trial data behind it is unusually solid.
For many older generics, discount cards and cost-plus pharmacies undercut insured prices. One analysis found Medicare could have saved $3.6 billion on 77 generics buying at cash-plus prices.
A harmonised meta-analysis of more than a million people found the association between sitting time and death disappeared in the most active quarter. In the least active, it did not disappear at all.
A European allergy task force concluded the antibody these tests detect is a marker of tolerance, not hypersensitivity. Meanwhile 19% of US adults believe they have a food allergy and about 10.8% have one.
A Cochrane review of 11 trials found flight stockings sharply cut silent deep-vein clots. But across nearly 2,900 passengers, the trials recorded no pulmonary embolism, death, or symptomatic clot at all.
Two real-world cohorts found lower blood levels per milligram from compounded formulations — and the longest longevity trial of rapamycin was run on the weaker one, which changes how to read it.
The pooled effect on self-reported stress was g = -0.35 from 785 participants. The authors of the meta-analysis warn against a miscalibration between the hype and the evidence — their phrase, not ours.
A European task force argued the first-generation drugs sold over the counter should not be. On symptom relief the newer ones differ from each other too — and the most familiar performed worst.
Two Cochrane reviews back scopolamine and first-generation antihistamines for preventing motion sickness. Both found the same gap: not a single randomised trial has looked at relieving symptoms already under way.
A Cochrane review of 18 trials and an NIH-funded randomised trial both failed to show that milk thistle improves liver disease. Product quality is also inconsistent, with some pills contaminated or mislabelled.
Pooling 13 randomised trials, people assigned to eat breakfast ended up 0.44 kg heavier and ate 260 more calories a day than people assigned to skip it. The trials were small, short and mostly low quality.
A 2026 meta-analysis of nine in vitro studies found a small, outlier-sensitive reduction in enamel microhardness. Every study was done on extracted teeth. The better-evidenced problem is sensitivity.
A NHANES analysis of 5,736 US adults over 60 found the benefit of higher protein directionally present and statistically imprecise. A meta-analysis of protein at breakfast found nothing at all.
Researchers searched in four languages across three engines. One in ten clinics said it would prescribe testosterone to men with normal levels; one in five claimed it cuts cardiovascular risk.
Two randomised trials in more than 1,800 children found no benefit in acute gastroenteritis. A Cochrane review of 23 trials found fewer upper respiratory infections, on low-certainty evidence.
In 390,124 US adults followed up to 27 years, daily multivitamin use showed no mortality benefit. Randomised trials within COSMOS found a real but modest effect on memory, and none on physical function.
No randomised controlled trial has tested a commercial detox diet in people, and the reviews that exist find no compelling evidence they remove toxins or aid weight. Some carry real risks.
US government metrologists sent one homogenised faecal standard to seven consumer testing services. Species counts came back ranging from 20 to 1,701 for the same material.
Expert guidelines back antibiotics for moderate-to-severe cases and simple measures for mild ones. The popular Pepto-Bismol prevention habit rests on 1980s data — and a 2025 trial could not confirm it worked.
Eye strain is close to universal among heavy device users, and it is temporary. The evidence that screen time causes myopia is real but weak, and every study of it measured screen time by questionnaire.
A dose-response meta-analysis of 94 cohorts and more than 30 million people found the steepest part of the curve sits between zero and the recommended weekly dose, with small and uncertain gains above double it.
A diet built to protect the brain looked powerful when researchers watched who chose to eat it. When they assigned it in a three-year trial, both groups improved by almost exactly the same amount.
There is no trial showing a cleanse product improves kidney function, which already filters blood continuously. One class of herbal kidney remedy is a proven cause of kidney failure and cancer.
Its 2024 guideline also advises against routine blood testing for vitamin D, on the grounds that no trial evidence supports it. The largest randomised trial found no effect on cancer, heart disease or fractures.
A meta-analysis of 44 cohorts covering 1,864,274 people found the risk signal attached to naps of 30 minutes or more. Below that threshold, no significant risk appeared.
Pooled biomarker data from 30 studies in 13 countries link higher linoleic acid to lower cardiovascular risk. The randomised evidence, 19 trials and 6,461 people, is null and rated low quality.
A network meta-analysis of 13 randomised trials put the diet ahead of every alternative for IBS symptoms. Its authors note the trials skipped reintroduction and personalisation entirely.
A Cochrane review of 64 trials found acetazolamide cut the risk of acute mountain sickness by about half. It is a genuine drug effect, not a folk remedy — and it is a prescription decision, not a supplement.
An umbrella review of 41 systematic reviews found no consensus that posture causes back pain. And correcting posture reliably changes alignment — but not, consistently, pain.
Reviews put patient satisfaction around 95 percent. FDA-collaborative studies also found that a large minority reported new glare, halos or dry eyes afterward — two true findings that must be held together.
SPF measures how much ultraviolet exposure it takes to burn, not how long you can stay outside. The randomised cancer-prevention evidence rests largely on 1,621 adults followed for more than a decade.
A Cochrane review found melatonin reduced jet lag in nine of ten trials. Sleep medicine's own guideline rates it a first-tier option for jet lag disorder. Take it at the wrong hour and it can make things worse.
A 2025 meta-analysis of 57 studies found the mortality curve bending at about 7,000 steps a day. The 10,000 figure traces to the trade name of a Japanese step counter sold in 1965.
A 2002 review went hunting for the origin of "8 x 8" and found nothing. Two decades later, isotope measurements in 5,604 people put daily water use anywhere from about 1 litre to about 6.
In a small pilot of older veterans, those walking fewer than about 4,100 steps a day before an operation were more likely to be frail. Most weren't walking enough to recover afterward.
Pooling 291 participants, researchers found time-restricted eating modestly lowered a liver enzyme and body mass index — but didn't significantly reduce liver fat itself or improve insulin resistance.
An analysis of the FDA's voluntary reporting database finds herbal and weight-loss products carry the highest serious-outcome rate. The author is explicit that these are flags for investigation, not proven risks.
A scoping review mapped 204 consumer nutrigenetic panels at a mean price of $234. Across them, 3,309 different genes were linked to dietary recommendations.
Two 2026 meta-analyses put a number on it: roughly a thousand extra steps daily in older adults and in heart patients. The catch is duration — the gains faded once the intervention stopped.
A review of two decades of research found ten studies on alkaline water and muscle outcomes — and every single one excluded adults over 65, the exact population the marketing targets.
Aligners reliably straighten mild-to-moderate crowding but struggle with rotations and extrusions. The evidence-based worry with direct-to-consumer kits is the absence of in-person diagnosis and monitoring.
Pooled across 23 trials, weight-loss apps beat a waitlist by about 2 kg at six months. Which features the app had made no measurable difference; adherence, which falls over time, is the real variable.
Guidelines say earwax that causes no symptoms should be left untreated. When wax truly blocks the ear, drops, irrigation or clinician removal help, but ear candles, when tested, removed no wax and caused injuries.
A single word on a label can stand for dozens of unlisted compounds. A few, like formaldehyde, are established hazards; the claim that everyday scented products make the general public ill rests mostly on self-report.
Bemotrizinol, a UV filter available in Europe and elsewhere since the early 2000s, cleared US regulatory review this month — more than a decade after a manufacturer first flagged it to the FDA.
The first large-scale policy evaluation of medically tailored meals covers 1,866 recipients across 11 health systems. It is quasi-experimental, not randomised — and that is the finding's main limit.
Wrist temperature rises after ovulation, not before it. That makes the watch's retrospective estimate biologically sound and useless as a way to predict the fertile window.
A panel of fitness and healthcare professionals reached full agreement on 27 medical conditions that call for caution — or, in two cases, avoidance — before starting resistance training.
Pooled trials find forest therapy lowers stress, anxiety, and blood pressure short-term. But heterogeneity is high and reviewers grade the certainty as low to very low.
A Milbank Quarterly analysis argues wellness companies use the political strategies of harmful commodities industries. A separate review puts the downstream cost of low-value wellness testing above $100 billion a year.
A network meta-analysis put pooled accuracy for the fertile window at 0.88, best in the three days around ovulation. A wrist-temperature study hit ovulation within three days about 78% of the time.
Pooled data across 38 studies found higher coffee intake linked to a higher risk of heart attack — but a lower risk of stroke and irregular heartbeat, with a separate benefit for people with high blood pressure.
Against a laboratory gas-exchange test, the Series 10 underestimated VO2 max by about 6 mL/kg/min on average, with wide limits of agreement. It reads trends better than absolute numbers.
A review explains why HIIT and CrossFit-style training can push exercise-induced muscle breakdown to the point of kidney injury, and what helps catch it earlier.
Twenty-one amateur runners took vitamin D3 or a placebo before a marathon. Some muscle and oxidative-stress markers looked better in the supplement group — but most measures showed no difference.
Health agencies conclude there is enough evidence to tie indoor dampness and mould to respiratory symptoms and asthma. Controlling the water source, not identifying the species, is what the evidence points to.
It is a medical-device biocompatibility standard, now built largely on lab-grown skin rather than animals. It measures whether a material irritates. It says nothing about whether a product works.
A 2025 meta-analysis found cold-water immersion cut stress 12 hours later, but not immediately — and its effect on immunity and mood did not hold up.
A six-year cohort study using Japan's long-term care records found a roughly 25% lower risk. The design cannot separate cooking from the ability to cook.
A pooled analysis of 30 randomized trials finds cold-water immersion reduces muscle damage markers and soreness, but showed no benefit for restoring strength.
Pooled across dozens of trials, activity trackers add roughly 1,800 steps a day and about 1 kg of weight loss. Effects on blood pressure, cholesterol and blood sugar are small and often not significant.
A February scientific statement declines to recommend the category for clinical decisions. Six weeks earlier, a journal retracted a validation study of a popular consumer model.
A meta-analysis of continuous glucose monitors in people without diabetes found a real effect on blood sugar — but only in those with prediabetes. In healthy users, the evidence for a metabolic benefit was not there.
A 220,000-person cohort found opposite associations for two neurodegenerative diseases depending on the type and distance of greenery. Two other February papers ask who can actually use it.
A small qualitative study finds device dependency, blurred motivation and users who no longer trust their own bodies. It lands as health services keep integrating the same devices.
Three UK studies of 1,907 sauna users point to social identity and ritual. Meanwhile a physiology paper shows a standard vascular measurement is confounded by heating itself.
A 131,821-person cohort followed for up to 43 years and a dose-response meta-analysis of 450,000 people converge on roughly two to three cups — and diverge sharply above it.
A UK Biobank analysis finds high step counts do not offset short sleep. A US cohort finds one-minute bursts matter. And in older adults, most step-count differences vanish after adjusting for age and sex.
A review found wearables gave valid maximal-oxygen-uptake estimates in most studies of untrained and recreational exercisers. A separate meta-analysis pooled a 0.83 correlation, with high variability.
The PROP OA trial found a 3.39-point gain on a 100-point score at six months. The effect on pain was larger than the effect overall, and both diminished by twelve months.
In 105,260 people followed for 7.6 years, higher intakes of sorbates, sulfites, nitrates and acetates tracked with modestly higher cancer incidence. This is an observational study of self-reported diets.
The gas is colourless, odourless and produced by any fuel-burning appliance. Because the early symptoms mimic flu, a working CO alarm is the one defence public-health data support.
Mindfulness, yoga, exercise and positive psychology landed within a narrow band of each other. Only combining exercise with a psychological approach pulled clear, and nature-based programmes did not beat controls.
Against an ECG over 536 nights, Oura's heart-rate-variability error was under 8% and Whoop's acceptable, while Garmin and Polar lagged. The recovery scores layered on top stay proprietary and largely unvalidated.
Brown University researchers pooled 16 studies covering more than 150,000 people. The consistent finding is not detox — it is that most participants are still drinking less months later.
A mirror that scores physiological age in 30 seconds. A watch that watches your gait for dementia. The gap between what these products measure and what they imply is the story of the show.
On the unprocessed diet, participants built plates 57% heavier and 110 calories lighter. The authors argue that fruit and vegetables were crowding out calories on purpose.
A December survey found getting stronger is the leading 2026 health goal. The best meta-analysis of muscle-strengthening and mortality finds a benefit that plateaus at around 30 to 60 minutes a week.
The line saying a product is not intended to diagnose, treat, cure or prevent disease must sit beside each health claim. Industry asked for that to change; the FDA says it may propose a rule.
The trial's own primary outcome — inflammation — was flat. What the new analysis adds is a molecular account of why the fat loss did not translate into the benefits fasting is sold on.
A 240-woman randomised trial compared three months of hatha yoga with a time-matched conditioning programme. On every sleep measure, the two groups moved together.
A study in this month's JAMA Internal Medicine mapped the rules governing IV hydration spas in every state, read 255 of their websites, and phoned them. Two of the websites cited a source.
Across 111 runners completing up to four trials each, two consumer devices tracked the direction of fluid loss reasonably well but missed the amount by 25% to 33% on average.
A meta-analysis of eleven depression trials found an average effect below the threshold for clinical importance, with signs of bias favouring creatine. A separate review found no change in kidney filtration.
One proposes a rate-of-change benchmark from 153 non-diabetic wearers. The other put ten young adults through food, exercise and a laboratory stress test to see what actually moves the line.
FTC staff guidance is explicit: an honest testimonial is not evidence. The advertiser still needs competent and reliable science for the claim the testimonial implies.
The trial was designed to test non-inferiority against traditional dietary advice. It found superiority instead, with 62% versus 42% achieving a clinical response over six weeks.
October brought pooled analyses of ginger and of marine omega-3s. Both report significant effects on blood markers. Neither measured whether anyone got healthier.
Forty-two trials show sleep-hygiene education helps a little and helps less than the alternatives. The sleep-medicine guideline suggests clinicians not use it on its own.
A meta-analysis of 20 trials found a two-kilogram gain in one-rep max and no effect on bone density. A small crossover trial found functional strength gains largely independent of muscle mass.
A 21-trial meta-analysis found effects concentrated in older age groups and largely absent elsewhere. A separate safety review of the most-used strain found no excess adverse events — and a big reporting gap.
Half a million Ontario users held a small average gain over 24 months. The least active gained nearly 2,000 steps a day — and the most active lost almost 4,000.
Twenty untrained women cycled at four fixed workloads wearing four popular low-cost bands, checked against indirect calorimetry. Every device drifted further from the truth as effort rose.
Most textiles sold as bamboo are rayon made from bamboo, and US regulators have said so for over a decade. In 2022 the FTC put a $5.5 million price on the difference.
A Spanish trial in 4,746 adults compared an energy-reduced Mediterranean diet plus exercise against the same diet eaten freely. Over six years the absolute gap was 12.0% versus 9.5%.
Fifty-five English adults ate two eight-week diets that both followed the UK Eatwell Guide. Both produced weight loss. The minimally processed version produced about one percentage point more.
Twenty adults sat for three hours at 39 °C with and without a fan, hydrated and not. Dehydrated, the fan raised heart rate and stopped feeling better, while sweat losses rose either way.
A meta-analysis of pedometer, tracker and smartwatch interventions lasting 12 to 48 weeks found no significant change in systolic or diastolic pressure — nor in weight, glucose or HbA1c.
Two BMJ reviews found high-risk usability problems in 18 of 30 tests, and use judged contrary to evidence-based guidance for 11 of the 19 conditions covered.
Collagen, flavanols and polyphenols beat their comparators on skin elasticity and sun tolerance. The pooled estimates carry heterogeneity of 95% to 98%, and some comparators were low doses of the same ingredient.
A BMJ network meta-analysis of 6,582 adults finds alternate day fasting the only intermittent method that beat continuous calorie restriction — by 1.29 kg, mostly in short trials.
Seventeen longitudinal studies of young carers, all from high-income countries. And 247 studies of women in prison, nearly all at high risk of bias in at least one domain.
One lab test measured 4.7% sensitivity for falls from a wheelchair. Crash Detection has flooded some 911 centres with automated calls from ski slopes and roller coasters.