Blueberries rank second to strawberries in popularity of berries. Blueberries have the highest antioxidant capacities among all fruits, vegetables, spices and seasonings. Antioxidants are essential to optimizing health by helping to combat the free radicals that can damage cellular structures as well as DNA. Researchers have shown blueberries contain pterostilbene, anthocyanins, proanthocyanidins, resveratrol, flavonols, and tannins. These substances could inhibit mechanisms of tumor cell development and inflammation in vitro.