A new study suggests that following a Mediterranean-style diet can help reduce the risk of dementia, even for people with high genetic susceptibility. The diet, rich in vegetables, fruits, nuts, whole grains, and low in red and processed meats, was associated with slower cognitive decline over a 30-year period. Researchers found that the benefits were particularly strong for individuals carrying two copies of the APOE4 gene, a major risk factor for Alzheimer’s disease.
Study Highlights and Implications
The study, published in Nature Medicine, analyzed data from more than 4,200 women and nearly 1,500 men, tracking dietary habits, genetic profiles, blood metabolites, and cognitive function over decades. APOE4 carriers face a significantly increased risk—one copy triples Alzheimer’s risk, while two copies raise it up to 12 times—but adherence to the Mediterranean diet appeared to mitigate some of these genetic effects.
Researchers note that APOE4 disrupts fat transport and influences brain inflammation and amyloid plaque buildup, which are linked to cognitive decline. While carrying the gene does not guarantee dementia, the study suggests that diet can meaningfully influence outcomes. The team emphasizes the potential for using dietary strategies alongside genetic and metabolite testing to personalize prevention and reduce dementia risk, though they caution that more diverse studies are needed to confirm these findings.
