Antioxidants are also thought to enhance blood flow and help maintain healthy cholesterol.Dark chocolate and cocoa powder are particulqrly rich sources of antioxidants. In fact, ounce for ounce, dark chocolate and cocoa have more antioxidants than antioxidants-rich foods like blueberries and green tea. Of course, it's not good to eat too much chocolate, but it's not a good idea to cut chocolate out altogether, either.