It’s only a small study but a researchers from the University of Cincinatti have shown that a group of 18 people in their 70s with memory loss who drunk two cups of blueberry juice per day for 12 weeks had improved memory and less depression. They attribute this effect to the blue pigment in blueberries which contains potent antioxidants called anthocyanins.
Bilberries have been traditionally used as a remedy for ailments ranging from diarrhoea and poor night vision to blood sugar control, but improvement of mental function is a promising new finding.
Krikorian R et al. Journal of Agricultural and Food Chemistry 2010 (Jan 4)