Miller MG, et al. - Whether or not dietary blueberry improves mobility and cognition among older adults was determined. Mobility and cognition were compared at baseline and after 45 and 90 days of dietary intervention among men and women between the ages of 60 and 75 years. The participants were asked to consume freeze-dried blueberries (24 g/day [equivalent to 1 cup of fresh blueberries]) or a blueberry placebo for 90 days. Significantly fewer repetition errors in the California Verbal Learning test and reduced switch cost on a task-switching test were noted among participants in the blueberry group relative to controls. No improvement in gait or balance was observed. Overall, it was shown that some aspects of cognition can be improved by the addition of easily achievable quantities of blueberries to the diets of older adults.