Milk chocolate has nothing on dark. It’s an antioxidant beast and can contribute to improved cardiovascular health. Filled with rich, cell-protecting antioxidants found in fruits, vegetables, grains and nuts, the pure cocoa in dark chocolate even rivals green tea and blueberries. Dark chocolate also contains flavonoids, a class of antioxidants that some researchers link to brain health. Opt for three ounces of 65 percent cacao or higher.