One of the best antioxidants that also helps fight cancer, diabetes, increases brain activity, boosts immune system and is good for your heart. Blueberries are rich in fiber and vitamins C and A. 1 cup a day. Other fruits you that can be substitued are açai berries, prunes, raisins, strawberries all the berries are pretty good. Jams are one of the best forms to eat them not only because it taste great and you can spread it on your morning toast but also because it maintains most of its nutrirnts that way. Açai has even more antioxidants than the blueberry but is not very well known.