Adults who ate closer to the MIND diet had slower loss of brain gray matter over about 12 years, according to an analysis of 1,647 participants in the Framingham Heart Study. The finding is an association from an observational study, not proof that the diet protects the brain.
The research, published in the Journal of Neurology, Neurosurgery & Psychiatry in March, drew renewed attention this week after ScienceDaily highlighted the study on October 1. It offers a measurable look at how everyday food choices may relate to brain structure as people age.
Gray matter holds many of the nerve cells involved in memory, learning, and decision-making. It shrinks gradually with age, and faster loss is one of the changes researchers track in studies of dementia and other brain diseases.
Berries, Poultry, and the 15-Point MIND Score
The MIND diet blends the Mediterranean diet with the blood-pressure-lowering DASH diet. According to the BMJ Group release, it encourages green leafy vegetables, other vegetables, berries, nuts, whole grains, fish, beans, olive oil, poultry, and moderate amounts of wine. It limits butter or margarine, cheese, red meat, pastries and sweets, and fried fast food.
Scores run from 0 to 15, with 15 meaning the closest adherence. Participants averaged just under 7, far from full adherence.
Each 3-point increase in the score was associated with 0.279 cubic centimeters per year slower gray matter decline. The researchers said that equals about 20% less age-related decline, or roughly 2.5 years of delayed brain aging. The same increase was linked to slower enlargement of the brain’s fluid-filled ventricles, which tend to widen as tissue is lost. That equaled about 8% less tissue loss and roughly one year of delayed brain aging.
Berries and poultry were the main contributors to the favorable links. Both were tied to slower ventricle growth, and poultry was also tied to slower gray matter decline. Sweets were tied to faster ventricle growth and shrinkage of the hippocampus, a key memory center, while fried fast food was linked to greater hippocampal decline.
“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 researchers wrote.
The associations were stronger in older participants and in those who were more physically active and not overweight or obese.
Brain Scans Show an Association, Not Proof
Because this was an observational study, it cannot show that the diet caused the slower shrinkage. Participants reported their own eating habits on food frequency questionnaires given at up to three checkups between 1991 and 2001, and the researchers acknowledged that such questionnaires are prone to recall errors.
Brain MRIs were taken between 1999 and 2019, and each participant had at least two scans. None had signs of stroke or dementia at the first scan. However, the researchers could not rule out mild cognitive impairment at that point, account for later changes in diet, or include genetic risk factors.
Some results complicate the picture. Higher whole grain intake was tied to faster gray matter and hippocampal loss, while cheese, a food the diet limits, showed a protective link. Participants were mostly white, so the results may not apply equally to other groups.
The study was funded by the Alzheimer’s Association, the Zhejiang University Global Partnership Fund, and China’s Fundamental Research Funds for the Central Universities.
Dr. David Katz, a preventive and lifestyle medicine specialist who was not involved in the work, noted that reverse causation is possible, meaning “people with healthier brain structure and function over time may have made better dietary choices,” as he told CNN. He added that the idea that eating well benefits the brain is the more plausible explanation.
Randomized trial evidence is less clear. A three-year trial in the New England Journal of Medicine of 604 older adults found no significant difference in cognitive change between a MIND diet group and a control group. Both groups followed a mildly calorie-reduced diet and lost weight. “What we saw was improvement in cognition in both groups,” lead researcher Lisa Barnes said in a Rush University release.
Aging Parents, Midlife Adults, and Kitchen Budgets
Participants averaged about 60 years old at the start, so the findings speak most directly to middle-aged and older adults. Adult children who cook for aging parents may see support for the general eating pattern, but not a guarantee against memory decline.
For people with a family history of dementia, the research suggests a link between diet and brain structure. It does not show that the diet prevents Alzheimer’s disease.
Cost can be a barrier, since fresh berries, fish, and nuts often cost more than processed foods. A clinician or registered dietitian can suggest lower-cost options.
Diet is only one of many factors that affect memory. People who notice new forgetfulness, confusion, trouble with familiar tasks, or personality changes in themselves or a relative should talk with a clinician. Sudden confusion or weakness needs emergency care.
People managing kidney disease, diabetes, or blood thinners should discuss diet changes with a health care professional and should not change prescribed medication on their own.
Larger and more diverse trials that include brain scans are needed to test whether the diet itself slows brain aging. For now, the study adds to evidence linking a plant-forward eating pattern with healthier brain aging, but it does not show that any single food protects memory.
Key Questions Answered
What did the Framingham MIND diet study find?
Among 1,647 adults followed for about 12 years, each 3-point increase in MIND diet score was associated with slower gray matter loss, equal to about 2.5 years of delayed brain aging.
Does this prove the MIND diet prevents dementia?
No. The study was observational and measured brain structure, not dementia diagnoses. It shows an association only.
Which foods stood out?
Berries and poultry had the strongest favorable links. Sweets and fried fast food were tied to faster shrinkage of the hippocampus, a key memory area.
How was diet measured?
Participants reported their own eating habits on food questionnaires between 1991 and 2001, which can introduce recall errors.
Who was studied?
Middle-aged and older adults in the Framingham Heart Study Offspring cohort in Massachusetts. They averaged about 60 years old at the start and were mostly white.
Should I change my diet because of this study?
Talk with a clinician or dietitian first, especially if you manage a chronic condition, take blood thinners, or have kidney disease. The study supports a general healthy eating pattern, not any single food.
Published by Medicaldaily.com
