Berries are loaded with fiber, which helps you feel full (and eat less). Berries top the charts in antioxidant power, protecting your body against inflammation and free radicals, molecules that can damage cells and organs. One study even showed that one-half to one cup of mixed berries a day improved cognition and motor performance in animals. James Joseph, PhD, director of the Neuroscience Lab at the United States Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, which conducted the study, notes that we become more susceptible to the damaging effects of free radicals and inflammation as we age. Berries help prevent those effects by turning off the inflammation signals triggered by cytokines and COX-2s, he says, making them an ideal part of your diet.