Blueberries are rich in fiber, which can improve constipation, and vitamins, sodium, copper and fructose, which can improve gastrointestinal digestion. Copper, selenium, and zinc enhance immunity, while iron also increases heme and oxygen concentration. Potassium helps maintain fluid balance, normal blood pressure and heart function. Rich in anthocyanins and vitamin C, blueberries have a good antioxidant capacity, which can neutralize free radicals in the human body to achieve anti-aging effect.