It is possible to lose weight and have smaller breasts. A large part of the composition of the human breast is fat tissue. After losing weight, the volume of adipose tissue in the whole body will be significantly reduced, including the breasts, which can be manifested as a smaller volume of the breasts, and may also be accompanied by a decrease in skin elasticity and so on. This phenomenon is more common in the clinic. In the process of weight loss, attention must be paid to strengthening the care of the chest. When exercising, it is recommended to wear a professional sports bra, which can avoid the breasts from sagging and becoming smaller. If you just pursue weight loss without helping your chest exercise, it is likely to lead to sagging breasts. It is possible to lead to sagging breasts. Do more exercises in your daily life, such as lifting dumbbells, push-ups, chest small muscles and so on. You should also eat more protein foods in your diet, such as eggs and beef.