Blueberries provide only 84 calories per cup and are an excellent source of fiber, vitamin C, vitamin K, and manganese. They also contain tons of antioxidants that have been linked to anti-aging, anti-cancer, and heart-health benefits. In fact, recent research shows that blueberries can help slow memory loss and improve coordination! (Read more about blueberry research at Tufts.edu and get more nutrition facts at Self.com.)