Banana belongs to a kind of fruit with high carbohydrate and high potassium content, and it is high in calories among fruit types, which is actually not suitable to be consumed in large quantities when losing weight. Each 100g of banana contains 93kcal of calories, 0.2g of fat, 1.2g of fiber, 22g of carbohydrates and 1.4g of protein, so some people use bananas instead of staple foods to lose weight, if compared to staple foods with nearly 350kcal per 100g, it is lower than the calories of staple foods. However, if you only rely on bananas as food for weight loss, the nutrients consumed by the body will be unbalanced, and the daily intake of too many bananas will cause some damage to the body. Bananas are rich in potassium ions, which may cause an increase in blood sugar. Therefore, if you want to lose weight, you should eat less, exercise more, and have a balanced diet.