What a 2026 vitamin D meta-analysis found in multiple sclerosis
A 2026 meta-analysis found a narrow vitamin D signal on MS relapse rates, but no clear overall benefit for disability scores or relapse risk.
Fitness
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Can cold exposure help with weight loss? The brown fat evidence
Cold exposure can switch on brown fat and raise short-term energy expenditure, but the best human evidence still finds only small, inconsistent effects on body fat.
Cold Plunges and Your Brain: What the Science Actually Shows
Cold plunges trigger a measurable surge of noradrenaline and dopamine, but the RCT evidence for long-term mental health benefits is still thin. Two recent studies clarify what the data do and do not support.
Carbon-plated shoes alter running biomechanics tied to bone stress injury risk
A new study of 23 elite distance runners found that carbon-plated shoes increased rearfoot eversion and lowered cadence compared to neutral trainers. The biomechanical shifts are small but cumulative, and recreational runners face more exposure than elites.
Best Running Gels, According to Editors and Science
Runner's World editors tested nine energy gels on taste, digestibility, and carbohydrate formulation across months of training. Here is which gels stood out and what the research says about how your body actually absorbs them during long runs.
Longevity
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Nutrition
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Omega-3 supplements accelerated cognitive decline in older adults, study finds
A 2026 analysis of over 800 older adults found omega-3 supplement users declined faster on three cognitive measures than matched non-users. Reduced brain glucose metabolism, not amyloid buildup, appeared to drive the effect.
Magnesium did not improve sleep or prevent night cramps, major cohort study finds
A new analysis of the population-based CoLaus cohort, published in the European Journal of Nutrition, found no evidence that magnesium supplements improve sleep quality. Magnesium users actually reported a higher likelihood of nocturnal leg cramps.
Vitamin D at 5,000 IU reduced depression symptoms most in new dose-response analysis
A 2026 meta-analysis of 15 RCTs finds vitamin D supplementation significantly reduces depressive symptoms, with 5,000 IU per day showing the greatest effect. Reductions in PTH and TNFα point toward anti-inflammatory mechanisms.
Fish oil supplements face mounting evidence of limited benefits and real risks
A growing body of research suggests fish oil supplements may not deliver the broad health benefits consumers expect and could pose risks including increased atrial fibrillation and possible cognitive decline in older adults.
