Antioxidants help protect the body against the damaging effects of free radicals and the chronic diseases associated with the aging process. Blueberries contain many of these naturally occurring antioxidants such as Vitamins C and E. In addition to this, blueberries also contain anthocyanins and phenolics that can also act as antioxidants. Blueberries are among the fruits with the highest antioxidant activity.