Blueberries are cold and contain a lot of sugar, so it is not suitable to eat more, which is easy to cause gastrointestinal discomfort, high blood sugar and excessive sugar intake, which affects health and causes obesity. It is most suitable for adults to eat about 50 grams a day, not more than 200 grams at most. Blueberries are rich in anthocyanins and have a strong antioxidant effect. They can eliminate free radicals in the body, protect cardiovascular and cerebrovascular diseases, promote skin cell metabolism, beauty beauty, delay aging and prevent memory decline. Moreover, blueberries are rich in dietary fiber and low in calories, which can promote digestion, relieve constipation and lose weight.