Search the studies

1. Cardiowell supported · human dataAdded 13 August 2026

   Breathing against resistance lowers blood pressure, and the case looks closed

   Inspiratory muscle strength training lowered systolic blood pressure by an average of 7.93 mmHg and diastolic by 3.80 mmHg across pooled results from 12 randomised trials, and the analysis judged these effects conclusive.

   ⚠What it shows: About as solid as this field gets: results pooled from 12 trials in 386 people across five countries, plus a further statistical check suggesting the blood pressure findings are unlikely to be overturned. The trials were short though, so nobody knows whether the effect lasts beyond 3 months.Meta-analysis · J Clin Hypertens (Greenwich)

   Full breakdown →Breathwork for Recovery and Stress →Heart Age Calculator →A hypotensive protocol of inspiratory muscle strength training: Systematic review and meta-analysis with trial sequential analysis. J Clin Hypertens (Greenwich) 2023
2. Trainingwell supported · human dataAdded 13 August 2026

   Electrical muscle stimulation matches lifting for strength gains

   Neuromuscular electrical stimulation produced virtually identical strength gains to conventional strength training across 19 randomised studies in healthy people, when training volume was matched between methods.

   ⚠What it shows: A trustworthy null: results pooled from 19 studies in healthy people, all matching the amount of training work between methods, found gains statistically indistinguishable. It covers strength only, so muscle size and sport performance remain open questions.Meta-analysis · J Strength Cond Res

   Full breakdown →Training volume explained →Training Volume Calculator →Neuromuscular Electrical Stimulation Training vs. Conventional Strength Training: A Systematic Review and Meta-Analysis of the Effect on Strength Development. J Strength Cond Res 2022
3. Longevitywell supported · human dataAdded 13 August 2026

   Older muscles learn to use oxygen better with training

   Across 7 trials in 370 older adults, exercise training improved muscle oxygenation, with resistance training enhancing oxygen extraction and blood vessel function, endurance training improving microvascular blood flow and oxidative capacity, and walking helping those with narrowed leg arteries.

   ⚠What it shows: Encouraging but thin: a sweep of all the studies turned up only 7 trials covering 370 older adults, some healthy and some with narrowed leg arteries. Programmes varied so much in length and intensity that no single best prescription emerges.Systematic review · Arch Gerontol Geriatr

   Full breakdown →VO2max Calculator →Exercise training in older adults, what effects on muscle oxygenation? A systematic review. Arch Gerontol Geriatr 2017
4. Trainingwell supported · human dataAdded 13 August 2026

   Gym strength turns into throwing speed for handball players

   Resistance training substantially improved handball players' maximal strength, muscle power and ball-throwing velocity across 18 pooled studies of 275 players, though it did not significantly improve isokinetic strength.

   ⚠What it shows: Points firmly in one direction, but treat the size of the effect with suspicion: results pooled from 18 studies of 275 players disagreed with each other a great deal, and favourable results appear likelier to have been published. The direction of the benefit is more trustworthy than its magnitude.Meta-analysis · Int J Environ Res Public Health

   Full breakdown →Progressive overload explained →One-Rep Max Calculator →Resistance Training and Handball Players' Isokinetic, Isometric and Maximal Strength, Muscle Power and Throwing Ball Velocity: A Systematic Review and Meta-Analysis. Int J Environ Res Public Health 2020
5. Supplementspreliminary · human dataAdded 12 August 2026

   Melatonin looks like a recovery aid for athletes, not a performance booster

   Across 21 controlled trials in highly trained athletes, melatonin supplementation at doses of 5 mg to 100 mg improved antioxidant status, inflammatory response and markers of muscle and liver damage. Its direct effect on sports performance remains unproven.

   ⚠What it shows: Encouraging for recovery markers but not proof of performance: a sweep of 21 controlled trials in highly trained athletes found better blood markers, yet doses ranged widely from 5 mg to 100 mg and no direct performance benefit was demonstrated. Findings in elite athletes may not transfer to everyday exercisers.Systematic review · Nutrients

   Full breakdown →Melatonin guide →Recovery Readiness Index →Impact of Melatonin Supplementation on Sports Performance and Circulating Biomarkers in Highly Trained Athletes: A Systematic Review of Randomized Controlled Trials. Nutrients 2024
6. Mindwell supported · human dataAdded 12 August 2026

   Exercise sharpens planning and reasoning in adults with depression

   Exercise training improved executive function in adults with depression across 14 randomised trials of 1201 people, with the largest gains in reasoning and planning. Benefits appeared for aerobic exercise at moderate to vigorous intensity, done three or more times a week for at least 13 weeks.

   ⚠What it shows: Solid enough to take seriously: results pooled from 14 trials of 1201 adults with depression all point the same way, though the overall gains were small. It also cannot say whether sharper thinking translates into relief from depression itself.Meta-analysis · Sports Med

   Full breakdown →Executive function explained →Heart Rate Zone Calculator →Effects of Exercise Training on Executive Functioning in Adults with Depression: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Sports Med 2023
7. Metabolic & GLP-1well supported · human dataAdded 12 August 2026

   Garlic nudges cholesterol, blood pressure and waistlines the right way

   Garlic supplementation reduced triglycerides, total cholesterol, LDL cholesterol, diastolic blood pressure, BMI and waist circumference versus placebo across 19 randomised trials of 999 adults with metabolic disorders.

   ⚠What it shows: Worth noting, not a prescription: results pooled from 19 trials of 999 adults with metabolic problems favoured garlic across six risk markers, but the studies disagreed with each other considerably. There are also signs that trials with negative results may never have been published, which would flatter the picture.Meta-analysis · BMC Complement Med Ther

   Full breakdown →Metabolic syndrome explained →Metabolic Fitness Index →Effects of garlic supplementation on components of metabolic syndrome: a systematic review, meta-analysis, and meta-regression of randomized controlled trials. BMC Complement Med Ther 2023
8. Women's Healthwell supported · human dataAdded 12 August 2026

   In PCOS, the strongest nutrition evidence points to supplements, not diets

   In women with PCOS, an umbrella review of 28 meta-analyses found supplements including probiotics, curcumin, fish oil, inositol and vitamin D improved insulin and blood sugar markers with moderate to high certainty, while no diet alone showed high-certainty benefits.

   ⚠What it shows: About as strong as nutrition evidence gets: this sweeps 28 collections of pooled trial results in women with PCOS and grades how trustworthy each finding is. Even so, certainty varied a lot by outcome, and the diet-only findings rested on very low to low quality evidence.Systematic review · Nutr Rev

   Full breakdown →Insulin sensitivity explained →Effects of nutrition on metabolic and endocrine outcomes in women with polycystic ovary syndrome: an umbrella review of meta-analyses of randomized controlled trials. Nutr Rev 2023
9. Trainingpreliminary · human dataAdded 12 August 2026

   Exercise for sarcopenia has a sweet spot, and more stops helping

   Across 29 randomised trials in middle-aged and older adults with sarcopenia, exercise dose showed an inverted U-shaped link with strength and mobility: handgrip strength gains were largest at 690 metabolic equivalent-minutes and functional mobility peaked at 830, so more was not better.

   ⚠What it shows: Reasonably solid, because it pools 29 trials where people were assigned at random, all in middle-aged and older adults with sarcopenia. The optimal doses come from statistical models rather than head to head tests, so treat the exact numbers as a guide, not a target.Review · Geriatr Nurs

   Full breakdown →Sarcopenia explained →Training Volume Calculator →Nonlinear dose-response effects of exercise modalities on handgrip strength and functional mobility in middle-aged and older adults with sarcopenia: A Bayesian network meta-analysis. Geriatr Nurs 2026
10. Women's Healthpreliminary · human dataAdded 12 August 2026

    Impact and strength training nudged bone density up after menopause

    Pooled trial evidence found small but significant increases in bone mineral density at the femoral neck and lumbar spine in postmenopausal women doing high-intensity, impact or strength training; no significant effect appeared in premenopausal women.

    ⚠What it shows: Worth taking seriously but modest: results pooled from 8 trials totalling 379 women, and the bone gains were small. Only two of those trials included premenopausal women, so the lack of effect before menopause could simply reflect thin data.Study · Menopause

    Full breakdown →Bone density explained →A systematic review and meta-analysis of the effects of high-intensity, impact, and strength training on bone mineral density in premenopausal and postmenopausal women. Menopause 2026
11. Trainingwell supported · human dataAdded 12 August 2026

    Moderate lifting three times a week ranked best for most bones

    A network meta-analysis of 34 randomised trials in 1746 middle-aged and older adults found moderate-intensity resistance training three times a week ranked highest for bone mineral density at most skeletal sites, while high-intensity training twice a week ranked best for total body density.

    ⚠What it shows: Fairly credible: results pooled from 34 trials in 1746 middle-aged and older adults, comparing training strategies across a network of studies. Many of the differences between strategies were not statistically significant, so the rankings point to a best bet rather than proving one.Meta-analysis · Calcif Tissue Int

    Full breakdown →Progressive overload explained →One-Rep Max Calculator →Optimal Resistance Exercise Strategies for Improving Bone Mineral Density in Middle-Aged and Older Adults: A Network Meta-Analysis Based on Exercise Intensity and Frequency. Calcif Tissue Int 2026
12. Tech & Wearablespreliminary · human dataAdded 12 August 2026

    Scalp current therapy eased pain a touch, did nothing for sleep

    Pooled results from six trials in 232 adults with musculoskeletal pain suggest transcranial alternating current stimulation modestly reduces pain compared with control, but shows no effect on sleep quality. The reviewers rated the overall certainty of the evidence as low.

    ⚠What it shows: An early signal at best: results pooled from just six trials totalling 232 people, and the reviewers rated their own certainty in the evidence as low for both outcomes. The pain benefit was modest, and sleep showed no change at all.Review · Complement Ther Med

    Full breakdown →Sleep Calculator →Efficacy of Transcranial Alternating Current Stimulation for Musculoskeletal Pain and Sleep Quality: A Systematic Review and Meta-Analysis. Complement Ther Med 2026
13. Mindwell supported · human dataAdded 12 August 2026

    Lifting weights sharpened thinking in older adults, impaired or not

    Across 18 studies pooled in a meta-analysis, resistance training improved overall cognitive function in adults aged 60 and over, in both the cognitively healthy and the cognitively impaired; short-term memory improved only in the cognitively healthy.

    ⚠What it shows: Credible but imprecise: results pooled from 18 studies of adults aged 60 and over, covering both healthy and impaired cognition. The studies varied in the training used and in how thinking was tested, so the true size of the benefit is uncertain.Meta-analysis · Aging Ment Health

    Full breakdown →Resistance training improves cognitive function in older adults with different cognitive status: a systematic review and Meta-analysis. Aging Ment Health 2022
14. Physiologypreliminary · human dataAdded 12 August 2026

    Lean mass predicts soldier performance where BMI falls short

    Across 17 studies of military personnel, greater lean mass was generally associated with better strength, power, load carriage and cardiorespiratory performance, while higher body fat, BMI, visceral fat and waist circumference tracked with poorer performance; direct body composition measures were more informative than BMI alone.

    ⚠What it shows: A consistent picture rather than proof: a sweep of all the studies on this found 17 in military personnel, and they mostly report links rather than cause and effect. The studies disagreed with each other too much to pool the numbers, and few included women.Study · Mil Med

    Full breakdown →Visceral fat explained →Body Fat Calculator →Body Composition and Physical Performance in Military Personnel: A Systematic Review of Anthropometric Predictors and Operational Implications. Mil Med 2026
15. Nutritionwell supported · human dataAdded 12 August 2026

    Fibre-fortified foods trimmed weight and cholesterol, and under 15 g a day was enough

    Foods fortified with fibre modestly reduced body weight, fat mass, total and LDL cholesterol, triglycerides, fasting glucose and HbA1c across 31 randomised trials. Solid foods worked better than drinks, and fortification below 15 g per day showed more benefits than higher amounts.

    ⚠What it shows: Strong as nutrition evidence goes: results pooled from 31 trials where people were assigned at random. The fibre types and foods varied widely, and one author works in a major food company's research arm.Meta-analysis · Crit Rev Food Sci Nutr

    Full breakdown →Metabolic syndrome explained →Impact of fiber-fortified food consumption on anthropometric measurements and cardiometabolic outcomes: A systematic review, meta-analyses, and meta-regressions of randomized controlled trials. Crit Rev Food Sci Nutr 2023
16. Gut & Microbiomepreliminary · human dataAdded 12 August 2026

    Probiotics gave healthy workers a small mood lift, and cortisol fell too

    Probiotic supplements had a modest but statistically significant effect on symptoms of depression, anxiety and stress in healthy working adults across 12 randomised trials of 3,350 people, and were linked to lower cortisol. A marker of systemic inflammation did not change.

    ⚠What it shows: Promising but not settled: results pooled from 12 trials in 3,350 healthy employed adults found only a modest effect. The trials used different strains, doses and durations, so nobody yet knows which probiotics actually help.Meta-analysis · BMC Psychol

    Full breakdown →Cortisol explained →Probiotic intake and mental health in healthy working adults: a systematic review and meta-analysis of randomized controlled trials. BMC Psychol 2026
17. Nutritionwell supported · human dataAdded 12 August 2026

    Legumes cut cholesterol and blood sugar; the gut benefit went unmeasured in trials

    Providing legumes (average 86 g a day) to 1,938 adults across 24 randomised trials lowered total cholesterol by 0.23 mmol/L, LDL cholesterol by 0.16 mmol/L and fasting glucose by 0.18 mmol/L. Not one eligible trial measured gut microbiome outcomes.

    ⚠What it shows: Worth taking seriously: moderate-certainty results pooled from 24 trials in 1,938 adults, some with existing conditions. The improvements were modest, and no trial was long enough or designed to test the gut microbiome effects legumes are famous for.Meta-analysis · Eur J Nutr

    Full breakdown →Metabolic syndrome explained →Heart Age Calculator →Legume intakes on cardiometabolic profile and gut microbiome function: systematic review and meta-analyses of randomised controlled trials. Eur J Nutr 2024
18. Nutritionwell supported · human dataAdded 12 August 2026

    Fibre lowers blood pressure, but only psyllium moved the needle on its own

    Viscous soluble fibre lowered systolic blood pressure by 1.59 mmHg and diastolic by 0.39 mmHg at a median dose of 8.7 g per day in pooled trials. Of five fibre types tested, only psyllium significantly reduced systolic pressure on its own, by 2.39 mmHg.

    ⚠What it shows: A real but small effect: results pooled from 22 trials in 1,430 people over a median of seven weeks. The studies disagreed with each other considerably, so the exact size of the drop is uncertain.Meta-analysis · Nutr Metab Cardiovasc Dis

    Full breakdown →Fibre explained →Heart Age Calculator →The effect of viscous soluble fiber on blood pressure: A systematic review and meta-analysis of randomized controlled trials. Nutr Metab Cardiovasc Dis 2018
19. Longevitypreliminary · human dataAdded 12 August 2026

    Weights and cardio may tune ageing muscle's mitochondria in different ways

    Across six randomised trials in 164 healthy older adults, exercise improved muscle mitochondrial quality, density, dynamics, oxidative capacity and antioxidant capacity. Resistance training was most tied to gains in mitochondrial density and dynamics, endurance training to antioxidant capacity.

    ⚠What it shows: An early signal rather than a settled answer: just six small trials covering 164 healthy older adults, and only one was rated good quality. The differences between training types need confirming before anyone builds a programme on them.Systematic review · Aging Clin Exp Res

    Full breakdown →Sarcopenia explained →Impact of exercise training on muscle mitochondria modifications in older adults: a systematic review of randomized controlled trials. Aging Clin Exp Res 2022
20. Women's Healthwell supported · human dataAdded 12 August 2026

    Combined exercise tops the table for menopause sleep

    Across 31 randomised trials, combined exercise ranked as the most effective of five exercise types for improving sleep quality in perimenopausal and postmenopausal women, with flexibility exercise second; the best-ranked types also improved quality of life.

    ⚠What it shows: Encouraging but not the final word: results pooled from 31 trials in menopausal women, with certainty rated only low to moderate depending on exercise type. The rankings rely partly on indirect comparisons, since most trials never tested the exercise types against each other.Meta-analysis · Climacteric

    Full breakdown →Sleep Calculator →Sleep quality in perimenopausal and postmenopausal women: which exercise therapy is the most effective? A systematic review and network meta-analysis of 31 RCTs. Climacteric 2025
21. Nutritionwell supported · human dataAdded 12 August 2026

    Post-workout protein builds muscle, night-time protein builds strength

    A network meta-analysis of 116 trials in 4,711 adults doing resistance training found protein taken after exercise was most effective for gaining muscle mass, protein at night was most effective for strength, and milk proteins were among the best types; no timing or type improved physical performance tests.

    ⚠What it shows: Solid for muscle and strength, but the rankings come mostly from indirect comparisons because trials rarely pitted one timing against another directly. It pools 116 trials in 4,711 adults doing resistance training, and the evidence was rated moderate certainty.Meta-analysis · Int J Sport Nutr Exerc Metab

    Full breakdown →Muscle protein synthesis explained →Protein Intake Calculator →Effects of Timing and Types of Protein Supplementation on Improving Muscle Mass, Strength, and Physical Performance in Adults Undergoing Resistance Training: A Network Meta-Analysis. Int J Sport Nutr Exerc Metab 2024
22. Tech & Wearableswell supported · human dataAdded 12 August 2026

    Tracking is tied to weight loss, but hardly anyone keeps it up

    In a systematic review of 39 randomised trials in adults with overweight or obesity, greater digital self-monitoring was linked to weight loss in 74% of the analyses that examined it, yet few interventions kept people tracking on at least 75% of days.

    ⚠What it shows: Convincing on consistency, weaker on cause: a sweep of 39 trials in adults with overweight or obesity found tracking and weight loss moving together, but it cannot prove the logging itself did the work. The real-world catch is that few programmes kept people tracking on most days.Systematic review · Obesity (Silver Spring)

    Full breakdown →Calorie Deficit Calculator →Self-Monitoring via Digital Health in Weight Loss Interventions: A Systematic Review Among Adults with Overweight or Obesity. Obesity (Silver Spring) 2021
23. Alcohol & Nicotinewell supported · human dataAdded 12 August 2026

    Drinking's mental fog can take a year of sobriety to lift

    In a meta-analysis of 62 studies, people with alcohol abuse or dependence showed moderate impairment across 11 of 12 cognitive domains in the first month of abstinence, deficits that persisted through the first year of sobriety and generally abated after 1 year.

    ⚠What it shows: Reassuring on recovery, but it compared different groups of people at different stages of sobriety rather than following the same individuals over time. It pools 62 studies of people with alcohol abuse or dependence, so it says little about moderate drinkers.Meta-analysis · Addict Biol

    Full breakdown →Executive function explained →Widespread and sustained cognitive deficits in alcoholism: a meta-analysis. Addict Biol 2013
24. Bones & Jointspreliminary · human dataAdded 12 August 2026

    Achilles tendons with tendinopathy shrank right after isometric exercise

    Across 12 pooled studies, people with midportion Achilles tendinopathy showed an immediate large reduction in tendon volume after isometric exercise, while healthy Achilles tendons kept their volume after acute loading.

    ⚠What it shows: Interesting but early: results pooled from 12 small studies of healthy and painful Achilles tendons, and several of the changes did not reach statistical significance. Whether a shrinking tendon means anything for pain or recovery is still unknown.Meta-analysis · J Biomech

    Full breakdown →Tendon explained →Immediate and long-term effects of mechanical loading on Achilles tendon volume: A systematic review and meta-analysis. J Biomech 2021

Back to the full archive · this week’s studies