Dietary intake of fish and omega-3 fatty acids has been linked with a lower incidence of Alzheimer’s disease and slower cognitive decline. Research published in Archives of Neurology (2005;62(12):1849–1853) examined age-related cognitive decline in relation to dietary patterns.
Participants underwent four standardized cognitive tests, with evaluations conducted three times over a six-year follow-up period. Dietary intake was assessed using food-frequency questionnaires. Higher fish consumption was associated with better preservation of cognitive function over time, suggesting a potential protective association between omega-3–rich foods and cognitive aging.
Additional evidence comes from a study published in the American Journal of Clinical Nutrition (2005;81(2):508–514), which evaluated whether dietary vitamin E intake was related to Alzheimer’s disease risk and cognitive decline. This study included more than 1,000 adults aged 65 and older, who also completed four standardized cognitive assessments. Dietary intake was again assessed using food-frequency questionnaires.
The researchers found that higher intake of vitamin E from food sources—not supplements—was associated with a lower risk of Alzheimer’s disease and less cognitive decline over time.
Taken together, these observational studies suggest that dietary patterns rich in fish, omega-3 fatty acids, and vitamin E–containing foods may be linked with better cognitive outcomes in older adults. While these findings do not establish causation, they are consistent with broader research examining the role of nutrition in brain aging.
