Generally there is no food that makes breasts smaller and flatter. Breasts are made up of fat and glandular tissues, so if you want to make your breasts smaller and flatter, you can control your fat intake appropriately. It is recommended to eat some lower calorie and satiety foods to control the mechanism properly in daily life. 1. Lower calorie: You can eat some lower calorie foods, such as celery, tomato, spinach, broccoli, seaweed, mushrooms, etc., which are suitable for people who want to reduce fat and may reduce the fat in the chest. 2. Satiety: Foods rich in dietary fiber are satiating, such as eggs, corn, oats, sweet potatoes, apples and so on. It can slow down the feeling of hunger, so as to control the diet and achieve the effect of reducing chest fat, thus to a certain extent can make the chest smaller and flatter. In addition, it is recommended to eat some lean meat, eggs, etc., as appropriate, to supplement protein while reducing fat, so as not to cause malnutrition. If the effect of fat reduction on diet is limited, you can also change the size of your breasts through surgery, such as liposuction, under the guidance of a professional doctor.