Let's talk about the problem of abdominal muscles when boys are thin, because our abdominal muscles are originally 8 muscles, and the muscles are connected by tendons. Muscles grow faster, while tendons are basically difficult to grow. So if we exercise a little, our muscles will be exposed, except for Mahayana's beer belly.
The abdominal muscles lost by boys are relatively simple. As long as the muscles are higher than the tendons, they will be exposed, because their low body fat ratio highlights their abdominal muscles. Such abdominal muscles are relatively flat, not particularly prominent, and easy to distinguish. The abdominal muscles exercised through fitness are hemispherical, which looks very prominent and has different visual effects.
Next, girls will not have chest problems if they lose weight, because the chest is a place to store fat. In ancient times, human beings were still relatively weak. At the bottom of nature's food chain, they often have a full meal, hungry and uncertain life, so survival is a problem. Therefore, the excess energy obtained from food will gradually be converted into fat and stored in the body. Fat is easy to store in chest, thighs, abdomen and other places.
When a woman loses weight and becomes thinner, the body starts to lose fat from unimportant parts. The fat in the chest is usually the least needed, so it will be consumed first. When a woman is pregnant, her breasts will become larger for breastfeeding. One more thing, when you get food supplements, your body will store more fat than before, which is why dieting is easy to rebound.
These are the reasons why boys lose weight and have abdominal muscles, while girls lose weight and have no breasts. We still need to do proper exercise to keep healthy.