MIND diet and brain aging: what a 12-year Framingham study adds, and what it can’t show
In a long-running US cohort, people who ate more closely to the MIND diet lost brain tissue more slowly, a difference the authors equate to about 2.5 years of brain aging. But a randomized trial of the same diet found no benefit over three years, so the link is not proof that the diet caused it.
A study widely reported on October 1, 2026 followed 1,647 middle-aged and older adults in the Framingham Heart Study Offspring cohort, who filled in validated diet questionnaires several times and had repeated brain MRI scans between 1999 and 2019. Over a median of 12.3 years, people who followed the MIND diet more closely lost grey matter more slowly. Each three-point higher MIND score went with a 20% slower age-related decline in total grey-matter volume, which the authors equate to about 2.5 years less brain aging over the follow-up, and with slower enlargement of the fluid-filled ventricles, another sign of brain shrinkage. The paper appeared in the Journal of Neurology, Neurosurgery and Psychiatry.
Why this does not settle the question
This is an observational study: people who eat this way may differ in many other ways that are hard to fully adjust for. The strongest test so far points the other way. In the 2023 MIND trial in the New England Journal of Medicine, 604 older adults with overweight and a family history of dementia were randomly assigned to the MIND diet or a control diet, both with mild calorie restriction. After three years, cognition improved in both groups by similar amounts, and changes on MRI, including grey- and white-matter volumes, were similar.
The trial was short and its control group also changed its diet and lost weight, so it may have missed a slow effect; the cohort is long but cannot rule out other explanations. Neither shows that the diet prevents dementia.
What it means for you
The MIND diet, a blend of Mediterranean and DASH eating that emphasizes leafy greens, berries, nuts, olive oil, beans and fish, is a sound way to eat for heart health, which in turn matters for the brain. Expect it to support health generally, not to guarantee protection against dementia. Our Mediterranean diet article covers the trial evidence, and our Alzheimer’s prevention article covers the risk factors with stronger evidence.