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In a study of 1,647 adults followed for an average of 12 years, stronger adherence to the MIND diet was associated with slower grey matter loss on MRI. Researchers said each three-point increase in diet score corresponded to 20% less age-related decline, or the equivalent of 2.5 years of delayed brain aging; the observational findings do not show that the diet caused the difference.
A study of 1,647 middle-aged and older adults found that people with higher scores for the MIND diet had slower loss of grey matter over time, a brain-structure change researchers said was equivalent to 2.5 years of delayed brain aging. Published online in the Journal of Neurology, Neurosurgery & Psychiatry, the observational study also linked stronger adherence to slower enlargement of the brain’s ventricles, but it cannot show that the diet caused either association.
Participants came from the Framingham Heart Study Offspring cohort and were about 60 years old, on average, when the study began. Researchers assessed diet using food-frequency questionnaires completed during checkups from 1991 to 2001. Participants had at least two brain MRI scans between 1999 and 2019, with scans spaced two to six years apart. They had no evidence of stroke or dementia at their first MRI.
Across an average 12-year follow-up, MRI scans showed age-related changes across the group, including declining brain and hippocampal volumes and increases in cerebrospinal fluid and ventricular volumes. For each three-point increase on the MIND diet scale, which runs from zero to 15, the researchers reported slower grey matter loss of 0.279 cubic centimeters per year. They described this association as 20% less age-related decline, equivalent to 2.5 years of delayed brain aging. Each three-point increase was also associated with slower ventricular expansion, at 0.071 cubic centimeters per year in the reported analysis, corresponding to about one year of delayed brain aging.
Some individual foods were associated with particular MRI measures. Higher berry intake was linked to slower ventricular enlargement, while poultry intake was associated with slower ventricular expansion and grey matter decline. Greater sweets consumption was linked to faster ventricular enlargement and greater hippocampal atrophy; fried fast food was associated with a larger decline in hippocampal volume. These are associations with specific scan outcomes, not evidence that any one food prevents brain changes.
What the MRI Associations Suggest
The results add brain-imaging data to earlier research connecting the MIND eating pattern with cognitive health. Grey matter is involved in memory, learning, decision-making and information processing, while the hippocampus is central to memory. Ventricles are fluid-filled spaces that can enlarge as brain tissue shrinks. Tracking these measures may help researchers study changes relevant to aging and neurodegenerative conditions, including Alzheimer’s and Parkinson’s diseases.
Still, an MRI measurement is not the same as a diagnosis or a direct measure of a person’s day-to-day cognitive ability. The study does not establish that following the diet will prevent dementia, preserve memory, or change an individual’s rate of brain aging. Its estimates describe how diet scores and brain-volume changes were related in this cohort. They should not be read as a guaranteed benefit for people who adopt the eating pattern.
The research may inform future studies of diet and brain health, particularly because associations were reported across repeated scans rather than at a single time point. The authors also found stronger associations among older participants, people who were more physically active, and those who were not overweight or obese. Those subgroup patterns are suggestive, but they do not establish which groups would benefit from a dietary intervention.
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How Researchers Measured Diet and Brain Change
MIND stands for Mediterranean-DASH Intervention for Neurodegenerative Delay. It combines elements of the Mediterranean diet and the DASH eating plan, which was designed to help lower blood pressure. The pattern emphasizes leafy greens and other vegetables, berries, nuts, whole grains, fish, beans, olive oil and poultry. It recommends limiting butter or margarine, cheese, red meat, sweets and fried fast foods, and includes moderate wine consumption.
Participants’ average MIND score was just under seven out of 15. People in the highest third of scores were more likely to be women and college-educated, and less likely to smoke, have obesity, type 2 diabetes, high blood pressure or cardiovascular disease. Those differences matter when interpreting the results: health, education and lifestyle characteristics may be related both to food choices and to brain outcomes.
The researchers also reported findings that did not fit a simple “more recommended foods, better scans” pattern. Higher whole-grain intake was associated with faster losses in grey matter and hippocampal volume and faster ventricular enlargement. Greater cheese intake was associated with slower declines in grey matter and hippocampal volume, less ventricular enlargement and fewer white matter hyperintensities. Such results underscore that observed food associations can be complex and do not, by themselves, establish the effects of changing one item in a diet.
““MIND-recommended foods rich in antioxidants, such as berries, and high-quality protein sources like poultry may reduce oxidative stress and mitigate neuronal damage.””
— The study researchers
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Limits of the Diet and MRI Evidence
The study was observational, so it cannot establish that MIND diet adherence caused slower tissue loss. Food-frequency questionnaires depend on participants remembering and reporting what they ate, which can introduce measurement error. Participants with higher scores also differed in education, smoking, obesity and health conditions, any of which may complicate comparisons even when researchers conduct additional analyses.
The reported “2.5 years” is an interpretation of the difference in the rate of grey matter decline associated with a three-point score increase. It does not mean that participants’ brains were measured as exactly 2.5 years younger, nor does it show that an individual can gain that amount of time by changing their diet. The supplied study report does not provide evidence that the association translates into fewer dementia diagnoses or improved cognitive performance. The unexpected findings for whole grains and cheese also remain unresolved.
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Questions for Future Diet Studies
The findings point to a need for research that can better test whether changing eating habits affects brain structure. Follow-up studies could examine diet and MRI changes over longer periods, use more detailed or repeated dietary assessments, and account for other health and lifestyle differences. Studies designed around a dietary intervention would be needed to test cause and effect more directly.
For now, the report supports a cautious reading: higher MIND scores were linked to slower changes in selected MRI measures in this group, but the effect of adopting the diet for an individual is unknown. Researchers will need to establish whether the associations hold in other populations and whether they correspond to meaningful differences in cognition or clinical outcomes.
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Key Questions
Does the study prove the MIND diet slows brain aging?
No. It was an observational study, which found that higher diet scores were associated with slower changes in some MRI measures. It cannot establish that the diet caused those differences.
What does “2.5 years of delayed brain aging” mean?
Researchers used that phrase to describe the association between each three-point increase in MIND score and a slower rate of grey matter loss. It is not a direct measurement that a participant’s brain became 2.5 years younger, or a predicted benefit for any one person.
What foods does the MIND diet emphasize?
The eating pattern emphasizes leafy greens, other vegetables, berries, nuts, whole grains, fish, beans, olive oil and poultry. It recommends limiting sweets, fried fast foods, red meat, butter or margarine and cheese.
Which foods were linked to the brain scan findings?
Berries and poultry were associated with some more favorable MRI measures, while sweets and fried fast foods were associated with some less favorable measures. The results describe food-specific associations; they do not prove that those foods produced the changes.
Did the study show that the diet prevents dementia?
No. Participants had no evidence of stroke or dementia at their first MRI, and the report focused on changes in brain structure. It did not establish that the diet prevents dementia or improves cognitive function.
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