Fitness, Health and Nutrition

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  • Walking in Longer Bouts Linked to Lower Heart Disease Risk in Less-Active Adults

    CATEGORY: HEART & CIRCULATION

    Among adults who walked relatively little, those who took most of their daily steps in sustained stretches of 10 minutes or more had lower rates of heart disease and death than those whose steps came in scattered bursts of under 5 minutes, a large UK study found. In other words, for people who are not very active, how steps are gathered through the day — not just the total — appeared to track with heart health.1

    How the Study Worked

    Researchers drew on 33,560 adults in the UK Biobank, a long-running health study, who averaged 8,000 or fewer steps a day and had no heart disease or cancer at the start. Each person wore a wrist activity tracker for about a week, which captured a snapshot of how they typically accumulated their walking — in short bursts or longer bouts. The researchers then sorted people by the bout length in which they took most of their steps and followed their health records for nearly eight years, counting new cardiovascular events and deaths from any cause.

    What the Numbers Showed

    The differences were sizable. Over the follow-up, people whose steps came mostly in bouts shorter than 5 minutes had about a 13% chance of a cardiovascular event, while those who walked mostly in bouts of 15 minutes or longer had about a 4% chance — roughly a third as high. Deaths from any cause followed the same pattern, falling from about 4% in the shortest-bout group to under 1% in the longest-bout group. Benefits appeared as bouts lengthened toward the 10-to-15-minute range.1

    Why Sustained Walking May Help

    A continuous walk gives the heart and circulation a longer, steadier workout than a quick stroll to another room. Sustained movement raises the heart rate enough to improve how efficiently the heart pumps and how well blood vessels relax and widen, effects that brief bursts may not fully deliver. Over time, that steadier demand is thought to support healthier blood pressure and circulation.

    What This Means

    This was an observational study, which can reveal an association but cannot prove that longer walks directly lower heart risk. Walking was measured just once, and people who move only in short bursts may differ in health from those who take longer walks. Even so, the findings suggest that for less-active people, gathering steps into longer, uninterrupted stretches may be a meaningful pattern — not a fixed prescription.

    Key Takeaways

    • Among less-active adults, taking most daily steps in sustained bouts of 10 minutes or more was linked to lower heart disease and death risk than walking in very short bursts.
    • The comparison was between roughly a 13% and a 4% chance of a cardiovascular event over the study — a large difference for a simple change in pattern.
    • If you walk relatively little, weaving longer continuous walks into your day is something you could raise with your doctor.
    • This study shows an association, not cause and effect; check with your healthcare provider before starting or changing an exercise routine.

    References

    1. del Pozo Cruz B, Ahmadi M, Sabag A, et al. Step Accumulation Patterns and Risk for Cardiovascular Events and Mortality Among Suboptimally Active Adults. Annals of Internal Medicine. 2025;178(12):1718–1727. link
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  • Higher Muscle Strength Linked to Lower Type 2 Diabetes Risk

    CATEGORY: METABOLIC & BLOOD SUGAR

    Adults with greater muscle strength were about 44% less likely to develop type 2 diabetes — a condition in which the body struggles to use insulin properly, so blood sugar runs too high — than those with the least strength, a large UK study found. Strikingly, the link held even for people whose genes put them at higher risk, suggesting stronger muscles may be associated with lower diabetes risk regardless of family history.1

    How the Study Worked

    Researchers followed 141,848 adults in the UK Biobank, a long-running health study, none of whom had diabetes at the start. Each person’s muscle strength was measured with a hand grip test and adjusted for lean body mass, then sorted into low, medium and high groups. The team also calculated each person’s inherited risk using a genetic score built from 138 DNA markers tied to type 2 diabetes. Over a median of about seven years, 4,743 people developed the disease, and the researchers compared how often it appeared across the strength and genetic-risk groups.

    What the Numbers Showed

    Compared with the weakest group, those with the highest muscle strength had roughly a 44% lower risk of developing type 2 diabetes. The connection was present at every level of genetic risk, though it was somewhat weaker among those with the strongest inherited risk. Even so, people at high genetic risk who also had high muscle strength had a lower estimated chance of diabetes over eight years than some people with lower genetic risk but weaker muscles.1

    Why Strength May Matter for Blood Sugar

    Muscle is where much of the sugar in your blood gets used for fuel. Stronger, more active muscle tends to pull glucose out of the bloodstream more readily and respond better to insulin, the hormone that ushers sugar into cells. When muscles are weak or underused, sugar is more likely to linger in the blood — which may help explain why greater strength tracked with lower diabetes risk.

    What This Means

    Because this was an observational study — one that tracks people without assigning them to groups — it can show an association but cannot prove that stronger muscles directly prevent diabetes. It is also possible that early, undiagnosed metabolic problems sap strength, rather than the other way around. Still, the findings add to evidence that muscle health and blood sugar are closely tied.

    Key Takeaways

    • In a large UK study, adults with greater muscle strength were about 44% less likely to develop type 2 diabetes than those with the least strength.
    • The link appeared even in people with a higher inherited risk of diabetes, though it was somewhat weaker in that group.
    • Building or maintaining muscle strength may be worth discussing with your doctor as part of your overall approach to health, especially if diabetes runs in your family.
    • This study shows an association, not cause and effect; talk with your healthcare provider before making changes to your exercise or health routine.

    References

    1. Wang M, Collings PJ, Jang H, et al. Prospective associations between muscle strength and genetic susceptibility to type 2 diabetes with incident type 2 diabetes: a UK Biobank study. BMC Medicine. 2025;23(1):93. link
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  • Stronger Sense of Purpose in Life Linked to Lower Risk of Cognitive Impairment

    CATEGORY: STRESS & MIND-BODY

    Adults who reported a stronger sense of purpose in life were about 28% less likely to develop cognitive impairment — lasting problems with memory and thinking — over the following years than those with the weakest sense of purpose, according to a study that followed nearly 13,800 U.S. adults for up to 15 years. Because it observed people rather than assigning them an outlook, the finding points to an association, not proof that purpose directly protects the brain.1

    How the Study Worked

    Researchers drew on the Health and Retirement Study, a long-running national survey, focusing on 13,765 adults aged 45 and older who had normal memory and thinking at the start. Each person’s sense of purpose was measured with a short seven-item questionnaire that captured how much they felt their life had direction and meaning. Their thinking was then tested every two years using a standardized telephone assessment of memory and mental sharpness. Over a median of eight years, and up to 15, the team tracked who crossed into cognitive impairment, defined as scores consistent with mild cognitive impairment or dementia on two consecutive check-ins. In all, 1,820 participants — about 13% — did so.

    What the Numbers Showed

    People with a higher sense of purpose were roughly 28% less likely to develop cognitive impairment than those with the lowest sense of purpose, even after accounting for age, sex, education, and depressive symptoms. On average, they also reached any impairment later in life. Notably, the link held even among people carrying APOE e4, a gene variant that raises the risk of Alzheimer’s disease — suggesting purpose was associated with lower risk regardless of inherited vulnerability.1

    Why Purpose Might Matter

    The study cannot explain how a sense of purpose and brain health are connected, but researchers have proposed several routes. People who feel their life has direction tend to stay more mentally and socially engaged, are more likely to keep up healthy habits, and often handle stress with less wear on the body — all of which have been tied to healthier aging. Purpose may also be a marker of overall well-being rather than a direct cause. Untangling those threads will take further research.

    What This Means for You

    Because this was an observational study, it cannot prove that building a sense of purpose would prevent memory decline, and a single questionnaire is only a snapshot of a complex trait. A dip in purpose is also common during life transitions and is not itself a diagnosis. If you are concerned about your memory, your mood, or your sense of direction, those are worth raising with a healthcare provider who can look at the fuller picture.

    Key Takeaways

    • In a study of nearly 13,800 older U.S. adults, a stronger sense of purpose in life was linked to about a 28% lower risk of developing cognitive impairment.
    • The association held even among people carrying a genetic risk factor for Alzheimer’s disease.
    • As an observational study, it shows a link, not proof that purpose directly protects the brain.
    • Ongoing concerns about memory, mood, or a sense of meaning are worth discussing with your doctor or a mental health professional.

    References

    1. Howard NC, Gerasimov ES, Wingo TS, Wingo AP. Life Purpose Lowers Risk for Cognitive Impairment in a United States Population-Based Cohort. The American Journal of Geriatric Psychiatry. 2025;33(10):1021–1031. link
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  • Healthier Versions of Low-Carb and Low-Fat Diets Linked to Lower Heart Disease Risk

    CATEGORY: EATING FOR HEART HEALTH

    When it comes to protecting your heart, the quality of the foods in a low-carbohydrate or low-fat diet appears to matter far more than the label on the diet itself. In an analysis of nearly 200,000 U.S. adults, healthier versions of both eating patterns — built around plant-based foods and whole grains — were linked to a lower risk of coronary heart disease, while less healthy versions were linked to a higher risk. Because the study tracked people’s usual habits rather than assigning diets, it shows an association, not proof of cause and effect.1

    How the Study Worked

    Researchers pooled three long-running studies — the Nurses’ Health Study, its sequel, and the Health Professionals Follow-Up Study — following 198,473 adults for up to about three decades. Every few years, participants filled out detailed questionnaires about what they ate, which let the team score how closely each person’s diet matched several versions of low-carbohydrate and low-fat eating. Crucially, those versions were graded by quality: some emphasized plant-based foods and whole grains, others leaned on animal products and refined carbohydrates. The team then counted who developed coronary heart disease — the narrowing of the arteries that supply the heart — recording 20,033 new cases, and cross-checked the dietary patterns against markers measured in blood samples.

    Quality Beat the Label

    Compared with people whose diets least resembled each pattern, those who most closely followed a healthy, plant-forward low-carbohydrate diet had about 15% lower risk of coronary heart disease, and those following a healthy low-fat diet about 13% lower. The picture flipped for the less healthy versions: diets high in animal products and refined carbohydrates carried roughly 14% higher risk in the low-carbohydrate group and about 12% higher in the low-fat group. In other words, whether a diet was labeled “low-carb” or “low-fat” mattered less than the kinds of foods filling the plate.1

    What the Body Showed

    The healthier eating patterns were also linked to a friendlier heart profile: lower triglycerides (a type of fat in the blood), higher HDL or “good” cholesterol, and lower levels of C-reactive protein, a marker of inflammation. The less healthy patterns showed the opposite. These blood signals help explain why food quality, rather than the low-carb or low-fat framing, tracked so closely with heart risk.

    What This Means for You

    Because this was an observational study, it cannot prove that eating one way causes or prevents heart disease, and the participants were mostly health professionals, so the findings may not apply to everyone. Still, the consistency across nearly 200,000 people is striking. If you are weighing changes to how you eat for your heart, that is a conversation worth having with your doctor or a registered dietitian.

    Key Takeaways

    • In a study of nearly 200,000 adults, the quality of a low-carbohydrate or low-fat diet was linked more strongly to heart disease risk than the diet type itself.
    • Versions rich in plant-based foods and whole grains were associated with lower risk; versions high in animal products and refined carbohydrates with higher risk.
    • Healthier patterns also tracked with better cholesterol, triglyceride, and inflammation markers in the blood.
    • Before making changes to your eating pattern for heart health, talk with your doctor or a registered dietitian.

    References

    1. Wu Z, Liu B, Wang X, et al. Effect of Low-Carbohydrate and Low-Fat Diets on Metabolomic Indices and Coronary Heart Disease in U.S. Individuals. Journal of the American College of Cardiology. 2026;87(20):2764–2781. link
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  • Mediterranean and Plant-Based Eating Patterns Linked to Lower Chronic Constipation Risk

    CATEGORY: GUT & DIGESTIVE HEALTH

    Adults whose everyday eating most closely resembled a Mediterranean or plant-forward pattern were meaningfully less likely to develop chronic constipation than those whose diets least resembled them, an analysis of nearly 96,000 U.S. health professionals found. Because the study observed people’s habits rather than assigning diets, it shows an association, not proof that one causes the other.1

    How the Study Worked

    Researchers pooled three long-running studies — the Nurses’ Health Study, its sequel, and the Health Professionals Follow-Up Study — covering 95,917 adults, many in their 60s and 70s. Every four years participants completed detailed food questionnaires, which let the team score how closely each person’s usual eating matched five patterns. They then identified who developed chronic constipation, defined as symptoms lasting at least 12 weeks in a year, counting 7,519 new cases. Comparisons were adjusted for other influences, including how much fiber and ultra-processed food people ate.

    What the Numbers Showed

    Compared with those whose diets least resembled each pattern, people at the top for a Mediterranean-style diet had about 16% lower risk of chronic constipation, and those highest on a plant-based index about 20% lower. The reverse was also true: diets highest in inflammation-promoting or classic “Western” foods carried roughly 24% and 22% higher risk. Vegetables and nuts stood out as the foods most tied to lower risk.1

    More Than Just Fiber

    The protective link held even after accounting for fiber, hinting that these eating patterns help in other ways too. One likely route is the gut microbiome — the trillions of helpful bacteria living in your intestines. Plant-rich meals feed those bacteria, which produce short-chain fatty acids (helpful compounds that keep the intestinal lining healthy and stool moving) and may also calm inflammation throughout the body.

    What This Does and Doesn’t Mean

    Because this was observational, it can’t prove that changing how you eat would ease constipation, and the participants were mostly older health professionals, so results may not apply to everyone. Constipation can also have many causes. If it is persistent, painful, or new for you, that is worth raising with your doctor rather than self-treating.

    Key Takeaways

    • In a large study, eating patterns rich in vegetables, fruits, whole grains, legumes, nuts and healthy fats were linked to a lower risk of chronic constipation.
    • The link held beyond fiber alone, pointing to the gut’s bacteria and lower inflammation as possible reasons.
    • Persistent or troubling changes in bowel habits are worth discussing with your doctor, who can rule out other causes.

    References

    1. Wang Y, Kuo B, Berschback M, Huttenhower C, Chan AT, Staller K. Dietary Patterns and Incident Chronic Constipation in Three Prospective Cohorts of Middle- and Older-Aged Adults. Gastroenterology. 2025;169(7):1475–1488. link
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  • Intensive Blood Pressure Treatment Linked to 15% Lower Dementia Risk in a Large Trial

    CATEGORY: DISEASE PREVENTION

    Adults with untreated high blood pressure who got extra help bringing it down were about 15% less likely to develop dementia over four years than those given usual care, a large randomized trial in rural China found. Because people were randomly assigned to the two approaches, this design offers stronger evidence than a typical observational study that lowering blood pressure may help protect the brain.1

    How the Study Worked

    Researchers enrolled 33,995 adults aged 40 and older who had high blood pressure — a persistent elevation in the force of blood pushing against artery walls — that was not under control. Their 326 villages were randomly split into two groups. In half, trained community health workers helped residents lower their blood pressure with medication and coaching on diet, salt, weight and activity; the other half continued with usual local care. Over four years, the teams tracked new cases of dementia — a lasting loss of memory and thinking ability serious enough to disrupt daily life — using standard memory and daily-function assessments.

    What the Numbers Showed

    The extra support worked: on average, the intervention group’s top (systolic) blood pressure number fell about 22 points more than in usual care. Alongside that, their risk of developing dementia was roughly 15% lower — a difference unlikely to be due to chance. Serious health problems overall were also slightly less common in the treated group.1

    Why Blood Pressure May Matter for the Brain

    Years of high pressure quietly damage the small blood vessels that feed the brain, reducing blood flow and contributing to the tiny areas of injury linked to both vascular dementia and Alzheimer’s disease. Keeping pressure closer to a healthy range may ease that strain, which could help explain why the treated group fared better.

    What This Means

    This was a carefully designed trial, so its results carry real weight — but the program combined medication with lifestyle coaching in one specific setting, and it does not tell any one person which treatment is right for them. Decisions about blood-pressure medication are personal and depend on your full health picture, so they belong with your own doctor.

    Key Takeaways

    • In a large trial, helping adults lower uncontrolled high blood pressure was linked to about 15% fewer cases of dementia over four years.
    • The benefit appeared alongside a meaningful drop in blood pressure and came from combining medication with lifestyle support.
    • If you have high blood pressure or questions about your numbers, talk with your doctor before starting or changing any medication or routine.

    References

    1. He J, Zhao C, Zhong S, et al. Blood pressure reduction and all-cause dementia in people with uncontrolled hypertension: an open-label, blinded-endpoint, cluster-randomized trial. Nature Medicine. 2025;31(6):2054–2061. link
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  • Slower Walking Speed Linked to Higher Fracture Risk in Older Adults

    CATEGORY: MOBILITY, BONES & JOINTS

    Older adults who walked more slowly were more likely to break a bone over the next few years than those who walked faster, a large study of Australians aged 70 and older found. Because the study measured people and then tracked what happened without changing anything, it shows an association, not proof that slow walking causes fractures.1

    How the Study Worked

    The findings come from ASPREE, a large study of 16,357 community-living adults aged 70 and older, together with its fracture substudy. At the start, researchers measured each person’s walking (gait) speed over a short timed walk, hand-grip strength with a squeeze device, and symptoms of low mood using a brief questionnaire. They then tracked bone fractures over a median of about 4.7 years — half the group was followed longer — recording breaks as they were reported and confirmed. This let the team see whether these simple measures of physical function lined up with later fracture risk.

    What the Numbers Showed

    Adults with slower gait speed had about a 17% higher risk of fracture than those who walked faster. Weak grip strength on its own was not clearly linked to fractures. When slow walking was combined with symptoms of low mood, the risk was higher still — about 46% greater than in people with neither — suggesting that physical and emotional health may add together.1

    Why Walking Speed May Matter

    Walking speed is a quick, whole-body snapshot of strength, balance and coordination, so a slower pace can reflect the same frailty that makes falls — and the fractures they cause — more likely. Slower walkers may also have weaker bones or be less steady on their feet. The study can’t untangle which of these matters most, and gait speed is a marker of overall health rather than a direct measure of bone strength.

    What This Does and Doesn’t Mean

    Because this was an observational analysis — watching what happened rather than testing a treatment — it can’t show that speeding up your walk would prevent fractures. What it offers is a reminder that simple measures like how fast you walk may help flag who is more vulnerable to breaks, information a doctor can weigh alongside bone-density testing and fall-risk checks.

    Key Takeaways

    • Among adults aged 70 and older, slower walking speed was linked to about a 17% higher fracture risk over roughly 5 years; the risk was higher when slow walking came with low mood.
    • Walking speed reflects overall strength, balance and steadiness, which may explain the link to fractures — but this study shows association, not cause and effect.
    • Grip strength on its own was not clearly tied to fracture risk in this study.
    • If you’ve noticed you’re moving more slowly or feel less steady, your healthcare provider can review your fall risk and bone health and discuss whether any testing makes sense.

    References

    1. Raru TB, Pasco JA, Lotfaliany M, et al. Associations of gait speed, grip strength, depressive symptoms, and their combinations with fracture risk in older adults. GeroScience. 2026 May 2. doi:10.1007/s11357-026-02271-2. link
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  • Erectile Dysfunction Linked to Higher Risk of Death in a 16-Year U.S. Study

    CATEGORY: MEN’S HEALTH

    Men who reported erectile dysfunction — ongoing difficulty getting or keeping an erection firm enough for sex — were more likely to die over the following years than men without it, including from heart disease, a long-term study of U.S. men found. Because the study followed men as they were rather than assigning any treatment, it points to an association, not proof that erectile dysfunction causes earlier death.1

    How the Study Worked

    Researchers drew on the National Health and Nutrition Examination Survey (NHANES), a long-running U.S. health survey, using data from 4,110 men aged 20 and older who answered a standard question about erectile function in 2001–2004. They then linked those records to national death records and tracked who died over a median of about 16 years — meaning half the men were followed longer than that. During follow-up, 1,226 men died, 419 of them from cardiovascular (heart and blood vessel) causes. The team adjusted for factors such as age, diabetes, high blood pressure and smoking to help separate erectile dysfunction from other explanations.

    What the Numbers Showed

    After those adjustments, men with erectile dysfunction had about a 45% higher risk of dying from any cause and about a 57% higher risk of dying from cardiovascular disease than men without it. The researchers noted that this added risk was in the same range as well-known heart risk factors such as diabetes, high blood pressure and prior stroke.1

    Why the Link May Exist

    Erections depend on healthy blood flow, so the small arteries involved can be affected by the same vessel problems — such as stiffening or narrowing — that later show up in the heart. Because those smaller vessels can show trouble earlier, erectile difficulties are sometimes described as a possible early signal of wider cardiovascular disease. This kind of study can’t confirm that chain of events, and erectile dysfunction has many causes, including medications, stress, and hormonal or nerve conditions.

    What This Does and Doesn’t Mean

    This was an observational study — it watched what happened rather than testing a treatment — so it can’t show that treating erectile dysfunction changes survival. What it adds is evidence that erectile dysfunction may be worth treating as a prompt to check overall heart health, not just as a stand-alone concern. It is a reason for a conversation with a doctor, not a diagnosis on its own.

    Key Takeaways

    • In a U.S. study following men for about 16 years, those with erectile dysfunction had roughly 45% higher odds of dying from any cause and 57% higher odds of dying from heart disease, on average, than men without it.
    • Erectile dysfunction may reflect early problems in blood vessels, which is why some researchers view it as a possible warning sign for the heart — though this study shows an association, not cause and effect.
    • Erectile dysfunction has many everyday causes and does not by itself mean heart disease is present.
    • If you experience ongoing erectile difficulties, your healthcare provider can help look into the cause and review your heart health — a worthwhile conversation to start.

    References

    1. Bhattacharyya S, Miller LE, Rojanasarot S, Patel DP. Association of erectile dysfunction with all-cause and cardiovascular mortality in US men: findings from NHANES 2001–2004 with 16-year follow-up. International Journal of Impotence Research. 2025 Nov 24. doi:10.1038/s41443-025-01218-z. link
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  • Two to Three Cups of Coffee a Day Linked to Lower Dementia Risk

    CATEGORY: BRAIN & MENTAL HEALTH

    Drinking a moderate amount of coffee — around two to three cups of caffeinated coffee a day — was linked to a lower risk of dementia in a large, decades-long study, with the benefit strongest at that moderate level and no extra protection from drinking more. Adults with the highest caffeinated-coffee intake had about an 18% lower risk of dementia than those who drank little or none. Because the study followed people’s own habits rather than assigning them coffee, it shows an association, not proof that coffee protects the brain.1

    How the Study Worked

    Researchers drew on 131,821 U.S. health professionals in two long-running studies who reported their diets, including coffee and tea, through repeated questionnaires. Participants were followed for up to 43 years, and the team recorded who was diagnosed with dementia — 11,033 people over the course of the study — while also testing memory and thinking. That long follow-up is central to the finding, because dementia develops gradually over decades.

    Where the Benefit Peaked

    The lowest dementia risk clustered around two to three cups of caffeinated coffee a day (or one to two cups of tea). Drinking more than that didn’t add further protection — but, unlike in some earlier research, it also wasn’t tied to harm. Coffee drinkers were also somewhat less likely to report their own memory slipping: about 7.8% reported such concerns, compared with 9.5% among those who drank little or no caffeinated coffee.1

    Why Caffeine May Be the Key

    The link appeared only with caffeinated coffee. Decaffeinated coffee showed no benefit, which points to caffeine — rather than coffee’s other compounds — as the likely active ingredient. Caffeine is a stimulant that affects brain signaling, though exactly how it might influence dementia risk over decades isn’t settled.

    What This Does and Doesn’t Mean

    Because people chose how much coffee to drink, the study can’t prove coffee keeps dementia away, and coffee drinkers may differ from others in ways that affect brain health. It also relied on people accurately recalling their intake over many years. Still, it adds unusually long-term evidence that a moderate coffee habit is linked to better brain health later in life — and that, for the brain, more is not necessarily better.

    Key Takeaways

    • In a study of more than 131,000 adults followed for up to 43 years, the lowest dementia risk clustered around two to three cups of caffeinated coffee a day, with no added benefit from drinking more.
    • Those with the highest caffeinated-coffee intake had about 18% lower dementia risk than those who drank little or none; decaffeinated coffee showed no such link.
    • This was an observational study, so it shows an association, not proof that coffee prevents dementia.
    • If you have questions about caffeine and your brain health — especially if you limit caffeine for heart, sleep, or other reasons — your healthcare provider can help you weigh what’s right for you.

    References

    1. Zhang Y, Liu Y, Li Y, et al. Coffee and tea intake, dementia risk, and cognitive function. JAMA. 2026;335(11):961–974. link
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  • Earlier Bedtimes Linked to More Next-Day Physical Activity in Wearable Study

    CATEGORY: SLEEP & RECOVERY

    People who went to bed earlier tended to be more physically active the next day, according to a large study that tracked sleep and movement through wrist-worn devices. Those who fell asleep around 9 p.m. logged roughly half an hour more moderate-to-vigorous activity the following day than those who turned in around 1 a.m. Because the study simply observed people’s own habits, it points to a link between sleep timing and next-day activity — not proof that going to bed earlier makes you move more.1

    How the Study Worked

    Researchers analyzed data from 19,963 adults who wore a fitness tracker (a WHOOP band) around the clock for a full year — nearly 6 million nights in all. The devices estimated when each person fell asleep, how long they slept, and how much moderate-to-vigorous activity (movement brisk enough to raise your heart rate, such as brisk walking or exercise) they did the next day. The team then checked the pattern against a separate group of 5,898 people who wore Fitbit devices, and it held up.

    What the Numbers Showed

    Bedtime stood out. Compared with people who typically fell asleep around 11 p.m. — close to the average — earlier sleepers did more the next day, up to about 20 extra minutes of moderate-to-vigorous activity for the earliest bedtimes. The gap between the earliest and latest sleepers was wider still: those asleep by 9 p.m. averaged about 28 more minutes of activity than those who went to sleep at 1 a.m.1

    Timing, Not Just Hours of Sleep

    The link also showed up within the same person from night to night. On nights when someone went to sleep earlier than their own usual time while still getting their typical amount of sleep, they tended to be the most active the following day. In other words, it wasn’t only how many hours people slept that tracked with activity — when they went to bed appeared to matter too.

    What This Does and Doesn’t Mean

    Because people chose their own sleep and activity, the study can’t prove one causes the other; early sleepers may differ in other ways, such as work schedules or morning routines. The data also came largely from people who chose to wear fitness trackers, who may be more active than average. What it adds is unusually detailed, real-world evidence that sleep timing and next-day movement are closely connected in everyday life.

    Key Takeaways

    • In wearable data from nearly 20,000 people, earlier bedtimes were linked to more next-day physical activity — about 28 extra minutes comparing a 9 p.m. bedtime with 1 a.m.
    • The connection appeared night to night within individuals: going to sleep earlier than usual, while keeping the usual amount of sleep, was linked to the most activity the next day.
    • This was an observational study, so it shows an association, not proof that earlier bedtimes cause more activity.
    • If you’re weighing changes to your sleep schedule, your healthcare provider can help you find an approach that fits your health and daily life.

    References

    1. Leota J, Czeisler MÉ, Le F, et al. Sleep duration and timing are associated with next-day physical activity: insights from two large-scale wearable sensor studies. Proceedings of the National Academy of Sciences. 2025;122(27):e2420846122. link
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