10 Blackberries… Anthocyanins, which give blackberries their dark color, are an antioxidant shown to reduce inflammation. As an antioxidant, they destroy free radicals in the body that harm cells and lead to cancer. Research has also shown that the ellagic acid in blackberries may have anti-cancer properties. One cup of blackberries contains half of the daily recommendation of the antioxidant vitamin C, which protects the immune system and may lower the risk of developing certain types of cancer.