Blueberries might be the best example of how good things come in small packages. Dietitian Anya Miller says that includes protection for your heart, thanks to something called an anthocyanin – a compound in these berries that gives them their deep blue hue. Studies have shown eating foods high in these anthocyanins can help lower your risk of developing coronary heart disease. Besides the heart-healthy perk, that serving of blueberries will get you some vitamin C, dietary fiber and natural sweetness. That makes them blueberries a boost for physical and mental health.