Brain candy: 5 best foods to eat for memory concentration and overall brain health The National

spinach in the bowl on the dark wood background. toning. selective focus on the lower right leaf (iStockphoto.com)

Chef Cutting salmon fish (iStockphoto.com)

Grilled chicken breast with vegetables

Close-up of tomatoes and red chili peppers hanging at a market stall, Sorrento, Sorrentine Peninsula, Naples Province, Campania, Italy (Getty Images)

A bowlful of delicious organic berries. Strawberries, blackberries, blueberries and raspberries. (iStockphoto.com)