Nutrition Research Brief

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Daily PubMed nutrition research with actionable dietary takeaways

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Nutrition Research Brief2026/05/26 20:22:23

Time-restricted eating shows no cardiometabolic benefit in real-world adults

A May 2026 systematic review and meta-analysis in the European Journal of Clinical Nutrition (Feit et al.) pooled 18 observational studies and found that a ≤12-hour daily eating window shows no significant association with abdominal obesity, metabolic syndrome, hypertension, HDL-C, triglycerides, or diabetes risk in community-dwelling adults. Two prospective nuances add precision: early eating (breakfast before 8 a.m. + >13h nightly fast) was associated with 53% lower T2DM incidence, and a U-shaped curve links both <10h and >14h fasting to higher mortality. The recommendation: prioritize established diet and lifestyle strategies first; if using TRE, front-load the eating window toward morning.

Nutrition Research Brief2026/05/25 20:20:53

Whole fruit beats fiber for constipation

A May 2026 network meta-analysis of 19 RCTs in the American Journal of Clinical Nutrition found that whole multicomponent foods (kiwifruit, prunes, mango) and fruit-based interventions outperform fiber supplements and conventional laxatives for functional constipation — with HIGH-certainty GRADE evidence for stool consistency improvement. The article covers study design, a ranked evidence table, dose-response data for mineral water and kiwifruit, a full limitations section, and a concrete daily protocol: 2–3 kiwifruit, 8–10 prunes, and 0.5–1 L magnesium-rich mineral water.

Nutrition Research Brief2026/05/24 20:19:01

Green tea extract boosts fat burn during exercise

A May 2026 dose-response meta-analysis of 9 RCTs in Nutrition Reviews finds green tea extract increases fat oxidation during exercise by +0.20 g/min (P=0.016), with a statistically significant dose-response relationship — the first formal quantification of this effect. Qualified recommendation: 270–400 mg EGCG/day, 60–90 minutes before moderate-intensity aerobic exercise.

Nutrition Research Brief2026/05/23 20:28:22

Curcumin + black pepper: what 19 RCTs show

A 2026 systematic review of 19 RCTs finds curcumin 500–1,500 mg/day + piperine 5–15 mg/day consistently reduces inflammation, improves blood lipids, and supports glycemic control in adults with metabolic syndrome, type 2 diabetes, or NAFLD — with clinically meaningful but modest effect sizes, and real drug-interaction risks that matter for polypharmacy patients.

Nutrition Research Brief2026/05/22 20:31:38

Weight loss didn't improve AF symptoms in older adults — here's what that means for dietary advice

A multi-center UK RCT (LOSE-AF, JAMA May 20, 2026; n=118) found that an 8-month low-calorie diet producing 9.7% weight loss in older adults with persistent atrial fibrillation failed to improve AF symptom scores. Weight loss was real and safe — AF did not respond. The takeaway: dietary weight loss supports cardiovascular health in AF patients but should not be framed as a primary rhythm-control strategy in older adults with established persistent disease.

Nutrition Research Brief2026/05/21 20:47:05

Do food preservatives raise heart disease risk?

A May 2026 European Heart Journal study of 112,395 French adults found that people with the highest intake of eight common food preservatives had 10–39% higher hazard ratios for hypertension and 16% higher CVD risk — but the study is observational, and the signal most likely reflects broad ultra-processed food consumption rather than preservatives themselves. The clearest action: cut processed meat, not the preservatives on the label.

Nutrition Research Brief2026/05/20 20:36:05

Vitamin D does not improve lung function in children with asthma

A 2026 systematic review and meta-analysis of 12 RCTs (1,239 children aged 4–18) found vitamin D supplementation produces no significant improvement in lung function, airway inflammation, or asthma control scores. The key distinction: vitamin D may reduce acute exacerbations in deficient children, but should not be used as a tool for improving stable lung function.

Nutrition Research Brief2026/05/19 22:00:27

Krill oil outpaces fish oil for plasma omega-3

A double-blind RCT in AJCN (May 16, 2026) found that krill oil delivers 1.4× more plasma EPA and 1.5× more plasma DHA than fish oil at the same 1.1 g/day dose over 12 weeks — meaning the two supplements are not dose-for-dose interchangeable.

Nutrition Research Brief2026/05/17 22:54:16

A 7-day food swap cut BPA by 60%: what the PERTH trial tells you to do today

The PERTH Trial (Nature Medicine, 2026) found a 7-day low-plastic diet cut urinary BPA by 60% and phthalates by up to 54%. One concrete action: swap canned goods for fresh, frozen, or glass-jarred alternatives and replace plastic food containers with glass or ceramic.

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