Apples are rich in pectin, which can accelerate the detoxification of human body and reduce the absorption of heat. The potassium contained can prevent leg edema, and the calories contained are not high, which is very beneficial to weight loss. Grapefruit contains acidic substances, which helps to increase digestive juice, promote digestive function and absorb nutrients. With low sugar content, vitamin C helps to eliminate fatigue and beautify the skin. Tomatoes contain a lot of vitamin C and dietary fiber, which can enhance people's satiety and promote human metabolism. Moreover, tomatoes are relatively low in calories and can be eaten as weight-loss snacks, which are both full and weight-reducing. Pineapple contains a lot of proteolytic enzymes, which is helpful for protein's digestion and weight loss. However, it should be noted that pineapple should not be eaten more, and it is best to eat it after meals, so as to avoid excessive acidity and damage to the stomach wall. Banana is a fruit with sugar as the main ingredient. After eating, it helps digestion and makes people feel full. More importantly, it contains low calories, which helps the human body to control appetite and lose weight.