Blueberries contain a plant compound called anthocyanin. This gives blueberries both their blue color and many of their health benefits. Blueberries can help heart health, bone strength, skin health, blood pressure, diabetes management, cancer prevention, and mental health. One cup of blueberries provides 24 percent of a person recommended daily allowance of vitamin C. Use blueberries to top waffles, pancakes, yogurt, oatmeal, or cereal, blend them in a smoothie or syrup, or fold them into muffins and sweet breads.