Unfortunately, the Mediterranean diet failed to preserve cognitive function over the course of five years in the Women’s Antioxidant Cardiovascular Study (WACS). The 2,500 women in the study, all over 65, at baseline had vascular disease or at least three risk factors for vascular disease.
Note that this research says nothing about prevention of age-related cognitive decline and Alzheimer dementia in women who don’t have baseline vascular disease. The Mediterranean diet seems to help that population.
Steve Parker, M.D.
Advanced Mediterranean Diet 