There is no exact definition of what makes a "superfood.” However, superfoods are considered to be nutrient powerhouses that provide large quantities of antioxidants, phytochemicals (chemicals in plants responsible for colors and smells), vitamins and minerals. Most superfoods are plant-based, but some fish and dairy also make the cut.
Examples of popular superfoods include salmon, kale, açaí berries, kefir and almonds, just to name a few. Since there is not a strict definition of superfoods, any food that is nutrient-dense is commonly put into this category.