Why Blueberries Are a Superfood Blueberries are an incredible food for many reasons. The variety tested in the 2010 Open Access Research article titled "The total antioxidant content of more than 3100 foods, beverages, spices, herbs and supplements used worldwide" by Carlson et al. ranks berries very high in antioxidant content. Blueberries specifically have an antioxidant content of 1.85 mmol/100g. For reference, bananas cultivated in the U.S. have a mean antioxidant content