"Tomato slimming" advocates eating a tomato before meals, which contains dietary fiber that cannot be digested and absorbed. While reducing the intake of rice and high-calorie dishes, prevent the body from absorbing more fat in food. The unique sour taste of tomatoes can also stimulate the secretion of gastric juice, promote gastrointestinal peristalsis, help fat burning, and help dietary fiber in tomatoes absorb excess fat in the intestines and excrete it together with fat and waste. Every100g tomato contains 16 calories. Even eating a medium-sized tomato (250g) has only 40 calories, which is equivalent to one-fifth of a bowl of rice. Apples with the same weight contain 107 calories, while tomatoes have less than half the calories of apples. Generally speaking, eating a medium-sized tomato before meals is the basic practice, and it can also be replaced by 180-250 cc of salt-free tomato juice.