Nutrition
The latest from Nutrition on Vitalspell.
Does intermittent fasting really beat standard dieting? What the Cochrane review found
A 2026 Cochrane review found intermittent fasting did little to outperform standard dietary advice for weight loss, with most evidence short term and low certainty.
Why Ozempic and Wegovy weight-loss plateaus happen
Ozempic weight-loss plateaus may reflect uneven brain-cell signalling, a new NIH mouse study suggests, though the finding is not yet clinical proof.
What the Ozempic Reddit study can and cannot tell us
The Ozempic Reddit side effects study mined more than 400,000 posts and surfaced symptom patterns worth investigating, but it cannot prove causation.
Does watermelon improve diet quality or heart health?
Watermelon and heart health claims start with better diet quality, but the direct cardiovascular evidence still comes from small, short-term studies.
BCAA metabolism and obesity: what the new Nature review found
BCAA metabolism and obesity are tightly linked in a new Nature review, but the evidence still points to metabolic state, not BCAA powders, as the story.
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What the new UPF study says about attention and dementia risk
Ultra-processed foods and dementia risk are linked in a new Australian study, but the clearest signal was lower attention, not proof of causation.
Which oily fish actually give you the most omega-3?
Which oily fish actually deliver the most EPA and DHA? A 2025 Cambridge review reveals farmed salmon now contains far less omega-3 than it did 20 years ago — here's what to eat instead.
How this Mediterranean diet trial cut diabetes risk
The benefit in the new Mediterranean diet trial came from a structured package of calorie reduction, exercise, and coaching, not from the diet label alone.
GLP-1 drugs and blood pressure: what 43,000 patients show
GLP-1 drugs and blood pressure are linked in a 32-trial meta-analysis, but most of the drop appears to come from weight loss rather than a direct drug effect.
Can grapes help protect skin from the sun?
Can grapes protect skin from UV damage? A 2026 human study found gene and oxidative-stress shifts, but the evidence is still early.
Why one protein target does not fit everyone
New protein research suggests age, activity and health status shape requirements more than a single public-health number can capture.
Does yo-yo dieting really wreck metabolism over time?
Yo-yo dieting may undo the gains of weight loss, but a 2026 review found little evidence that it permanently damages metabolism.
Do electrolyte powders help hydration and exercise performance?
Evidence suggests sodium-plus-carb drinks can help on long, hot, sweaty efforts, but for shorter or easier sessions plain water is often enough.
Sodium Nitrate May Block Heart Benefits of Exercise in Women
A Dalhousie University study in Scientific Reports finds that sodium nitrate, the active compound in beetroot-based workout supplements, prevented exercise-induced cardiac adaptations in female mice — raising fresh questions about whether women benefit from nitrate supplementation at all.
GLP-1 Drugs Shed Mostly Fat, Not Muscle, Real-World Data Show
New real-world data from Vienna suggests GLP-1 obesity drugs primarily reduce fat mass while preserving skeletal muscle, challenging the narrative that the drug class causes clinically meaningful muscle wasting.
How Much Protein Do You Really Need?
The 2025–2030 Dietary Guidelines raised the official protein recommendation by 50 to 100 percent, sparking a debate between protein researchers and public-health voices. Here's what the evidence actually says about who benefits and who might not need to change a thing.
How Exercise Regulates Your Appetite: What the Science Says About Brain Reward Centers
A growing body of research shows that high-intensity exercise suppresses appetite by reducing the hunger hormone ghrelin and increasing satiety hormones like GLP-1, while also modulating how the brain responds to food cues. At the center of the effect: lactate.
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.
Berberine derivative lowered HbA1c by 1% in 12-week diabetes trial
A phase 2 randomized trial published in JAMA Network Open found that HTD1801, an oral compound combining berberine with ursodeoxycholic acid, reduced HbA1c by 1.0 percentage point over 12 weeks. The drug also improved insulin sensitivity, lipid profiles, and liver enzyme levels, with two phase 3 trials now completed and an NDA submission planned.
5-MTHF prenatal trial: what the Ritual-funded RCT actually showed
A 24-week randomized trial in Frontiers in Nutrition compared 5-MTHF and folic acid prenatal multivitamins in 62 second- and third-trimester pregnancies. The methylated form held folate status with about a quarter of the unmetabolized folic acid. Industry-funded, narrowly scoped, and worth reading carefully.
Vitamin B12 and muscle mitochondria: what the latest research reveals
New research from Cornell shows vitamin B12 directly affects skeletal muscle energy production at the mitochondrial level. In aged mice, B12 supplementation doubled a key enzyme's activity, raising questions about whether marginal deficiency contributes to age-related muscle decline.
What Runners Get Wrong About Race-Day Fueling
Most runners under-fuel, mistime their intake, or ignore carbohydrate type on race day. Research on 250-plus London Marathon runners and studies on pre-race timing and multiple transportable carbohydrates show how much performance is left on the table when fueling goes wrong.
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