Weight loss is mainly to reduce the subcutaneous fat, young women’s mammary glands contain a small amount of fat under the skin, and the fat will be slightly reduced after losing weight. The mammary gland is mainly composed of glands and ducts, mainly connective tissue, will not be affected by fat loss, the impact on the mammary gland after losing weight is relatively small, through the upper limbs, chest muscle strength exercise, play a role in shaping the chest, there is an improvement in the effect of the mammary gland, and the purpose of weight loss through sports exercise. Pay attention to a reasonable combination of nutritional diet, eat more high-protein foods, eat more fresh vegetables and fruits, ensure sufficient sleep, and develop good living habits. Through weight loss to lose weight, the impact on the chest mammary glands is relatively small, it is not recommended to lose weight through dieting fat loss.