Study Suggests Up to 2.5 Extra Years of Brain Health
A dietary pattern designed to lower blood pressure while incorporating elements of the Mediterranean diet may help slow structural brain aging. New research published in a journal of the British Medical Association found that closer adherence to the MIND diet was associated with slower brain shrinkage — potentially translating into up to 2.5 additional years of brain health.
Some degree of brain shrinkage is a normal part of aging. However, researchers reported that individuals who followed the MIND diet more consistently experienced reduced rates of gray matter loss and ventricular enlargement compared with those whose diets aligned less closely with the guidelines.
Long-Term Tracking of Brain Structure
The study followed 1,647 middle-aged and older adults for an average of 12 years. Participants underwent routine health evaluations every four to eight years and MRI scans every two to six years. Dietary habits were assessed using food intake questionnaires.
The MIND diet — short for Mediterranean–DASH Intervention for Neurodegenerative Delay — emphasizes nutrient-dense foods linked to cardiovascular and cognitive health. Unlike earlier research focused primarily on memory test performance, this analysis examined measurable structural changes in the brain.
Foods Emphasized and Limited
The eating plan encourages regular intake of:
Green leafy vegetables and other vegetables
Berries
Nuts
Whole grains
Fish
Beans
Olive oil
Poultry
It advises limiting fried or fast foods, pastries and sweets, butter and margarine, cheese and red meat.
Researchers noted that antioxidant-rich foods such as berries and high-quality protein sources like poultry may help reduce oxidative stress and neuronal damage. In contrast, fried foods and trans fats may contribute to inflammation and vascular harm.
Measured Brain Benefits
Adherence was scored on a scale from 0 to 15, with the average participant scoring just under 7. Each three-point increase in diet score was associated with measurable structural differences:
20% less gray matter loss, equivalent to about 2.5 years of delayed brain aging.
8% less ventricular enlargement, equivalent to roughly one year of delayed brain aging.
Berries and poultry emerged as the strongest contributors to positive outcomes. Higher intake of sweets was associated with faster ventricular expansion and degeneration of the hippocampus, a region essential for memory. Fried fast foods were also linked to greater hippocampal decline.
Unexpected Findings and Broader Context
Not all results aligned with expectations. Greater whole grain consumption was linked to faster gray matter decline and ventricular expansion. Meanwhile, higher cheese intake — typically limited under the MIND diet — was associated with slower gray matter and hippocampal loss.
Benefits were most pronounced in older adults who were physically active and not overweight, suggesting that dietary patterns may work best when combined with broader healthy lifestyle habits.
Researchers concluded that the MIND diet shows promise as a brain-supportive dietary approach and may contribute to slowing neurodegeneration as people age, though diet alone does not fully determine long-term cognitive outcomes.