A new study suggests that following a Mediterranean-style diet can significantly reduce the risk of dementia, even for individuals with strong genetic predispositions. The diet—rich in vegetables, fruits, nuts, whole grains, and low in red and processed meats—was linked to slower cognitive decline over a period of three decades.
APOE4 Gene Variant and Cognitive Health
One of the most significant genetic risk factors for Alzheimer’s disease, the APOE4 variant, can triple the risk for those with one copy and increase it up to 12 times for individuals with two copies. The research found that participants adhering to the Mediterranean diet experienced lower rates of cognitive decline, with the strongest protective effects seen in people carrying two copies of APOE4.
The study, involving over 5,600 participants, also examined blood metabolites to understand how diet interacts with genetic risk factors. Researchers highlighted that the Mediterranean diet may influence metabolic pathways linked to brain health, potentially counteracting the negative effects of APOE4.
Although the study focused primarily on participants of European ancestry and highly educated backgrounds, it underscores the potential for diet to play a meaningful role in dementia prevention. Researchers suggested that incorporating genetic and metabolic testing into patient assessments could help tailor dietary recommendations and strategies to reduce cognitive decline.
