Diet quality in midlife not associated with later risk for dementia

The quality of diet for adults in midlife (average age 50) wasn't associated with later risk of dementia in a study that included adults followed for more than two decades. Other observational studies have suggested diet may be linked to cognitive health but those studies often had short follow-up periods that could not cover the long preclinical period before dementia diagnosis. In this study, about 8,200 adults were without dementia in 1991-1993 and 344 cases of dementia were recorded during nearly 25 years of follow-up. During that time, the adults completed diet questionnaires to assess the quality of their diets, with a higher consumption of vegetables, fruits, whole grains, nuts and legumes, omega-3 fatty acids and most polyunsaturated fatty acids indicating a healthier diet. Researchers report that repeated assessments of diet quality during midlife didn't show any significant association with subsequent risk for dementia. The study relied on self-reported food frequency questionnaires.