Weight loss usually results in smaller breasts because the main components of the breasts can be imagined as a bun structure, with the skin of the bun being the skin and subcutaneous fat layer of the breast and the filling of the bun being the glandular tissue of the breast. When weight loss occurs, as the whole body fat decreases, the subcutaneous fat of the breast also becomes thinner, and although the mammary glandular tissue is not affected by the weight loss, the overall volume of the breast still becomes smaller. In some people, because the subcutaneous fat over the breast is very thin and the main component of the breast is the mammary gland, the change in the breast will be very small and minimal when such a person loses weight. Therefore, most people’s breasts will become smaller when they lose weight, but for people whose breasts are primarily glandular in composition, the effect may be more minimal.