Fewer people stop to think that the same breakfast or dinner may also leave its mark on how the brain holds up over the decades.
Adults who stuck most closely to the MIND diet showed less brain shrinkage on MRI scans over roughly 12 years.
The slower loss worked out to about 2.5 years of delayed brain aging.
The data come from 1,647 middle-aged and older adults in the Framingham Heart Study Offspring cohort, published in the Journal of Neurology, Neurosurgery & Psychiatry.
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What the MIND diet looks like on a plate
The MIND diet mixes two older eating patterns, the Mediterranean and DASH diets, and sharpens the focus on brain-friendly foods.
It names ten food groups to eat often and five to pull back on.
The ten to lean into are green leafy vegetables, other vegetables, berries, nuts, beans, whole grains, fish, poultry, olive oil and wine in moderation.
Try to limit red meat, butter and margarine, cheese, pastries and sweets, and fried or fast foods.
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In this study, berries and poultry stood out as the foods most clearly linked to healthier brain changes.
Sweets and fried fast foods were tied to greater tissue loss.
What the imaging actually measured
Participants started the study at around age 60 and had MRI brain scans repeated between 1999 and 2019.
Their diet was scored on a 15-point MIND scale drawn from food questionnaires.
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Each 3-point jump in that score was linked to roughly 20 percent less age-related loss of gray matter, the outer tissue that handles memory, learning and decision-making.
That difference worked out to about 2.5 years of delayed brain aging.
The researchers also saw slower enlargement of the brain's ventricles, the fluid-filled spaces that tend to grow as surrounding tissue shrinks.
On that measure, the slowing worked out to roughly one extra year.
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What this does and does not prove
This is an observational study, so it cannot prove that the diet itself caused the slower brain changes.
People who eat this way may also move more, sleep better or carry fewer risk factors like high blood pressure.
For readers already looking to protect their brain, berries and poultry were the two foods most tightly linked to healthier brain scans in this study.
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This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.