A new study suggests that following a Mediterranean-style diet can help reduce the risk of dementia and slow cognitive decline, even for those with high genetic susceptibility. The diet, rich in vegetables, fruits, nuts, whole grains, and low in red and processed meats, appears to have protective effects on brain health over decades.
APOE4 Carriers Benefit Most
One of the strongest genetic risk factors for Alzheimer’s disease is the APOE4 variant. Having one copy triples the risk, while two copies increase it up to twelvefold. The research, published in Nature Medicine, found that people with the APOE4 variant who adhered closely to a Mediterranean diet experienced slower cognitive decline and lower dementia risk, with the benefits most pronounced for those carrying two copies.
The study tracked over 5,700 participants for three decades, analyzing long-term dietary habits, genetic data, and cognitive testing. Researchers also investigated blood metabolites, revealing how the diet may influence key metabolic pathways linked to brain health. While the participants were mostly well-educated and of European ancestry, the findings suggest that dietary strategies could be a powerful tool in dementia prevention, especially for genetically at-risk individuals.
The authors noted that carrying the APOE4 variant does not guarantee Alzheimer’s, and emphasized the potential of personalized approaches combining diet and metabolic monitoring to reduce dementia risk.
