Diet Slows Brain Aging
New 2026 studies link higher adherence to the Mediterranean/MIND diets with slower brain ageing — a three‑point MIND improvement was associated with ~20% less gray‑matter shrinkage (≈2.5 years delayed brain aging) and about a 23% lower dementia risk. Researchers emphasize plant‑forward fats and daily legumes as core drivers of the effect. ( )
A prospective analysis led by Hui Chen and colleagues examined 1,647 participants from the Framingham Heart Study Offspring cohort, calculating MIND scores from validated FFQs at Exams 5–7 and tracking brain MRIs taken between 1999 and 2019 (median 3 scans) over a median 12.3-year follow-up; the paper appears online in the Journal of Neurology, Neurosurgery & Psychiatry (doi:10.1136/jnnp-2025-336957). (jnnp.bmj.com) The imaging team used linear mixed models and reported that higher MIND adherence was linked to slower lateral ventricular enlargement overall (−0.071 cm3/year) and in the left lateral ventricle specifically (−0.041 cm3/year), equating to roughly an 8% attenuation of age‑related ventricular expansion. (jnnp.bmj.com) Component-level signals in the Framingham analysis flagged berries as correlated with slower ventricular increases and poultry with slower gray‑matter decline, while the authors also reported unexpected associations — for example, higher whole‑grain intake related to less favourable change in some brain measures. (medicalxpress.com) A separate, larger UK Biobank analysis of 60,298 people published in BMC Medicine found that stronger adherence to a Mediterranean‑style diet was associated with up to a 23% lower risk of incident dementia during ~9.1 years of follow‑up. (link.springer.com) An American Journal of Clinical Nutrition prospective analysis of 5,944 Health and Retirement Study participants (mean age 68) reported that greater intake of vegetable fats — and substitution of animal fats with vegetable or monounsaturated fats — was associated with lower incident dementia risk, supporting fat‑source substitution as a potential prevention strategy. (ajcn.nutrition.org) Longer‑term outcome data add context: a National Institute on Aging–funded JAMA Network Open cohort of 92,383 U.S. adults found consuming >7 g/day of olive oil was associated with a 28% lower risk of dementia‑related death, reinforcing evidence for plant‑source oils in brain outcomes. (jamanetwork.com) The study authors and external experts stressed that the Framingham findings are observational — baseline gray‑matter volumes were similar across adherence groups and the team called for randomized trials and longer follow‑up to establish causality and temporality. (sciencemediacentre.org)
