With the reduction of subcutaneous fat, the skin is not as full as before, and the reflection of light is not as flat as before, which naturally makes people feel dull and dull.

Melanin is related to fat. In the skin with fat, the number of melanocytes decreases, and the enthusiasm for producing melanin is also greatly reduced. After the enthusiasm was reduced, tyrosinase, TRP 1 and TRP2, which produced melanin, also decreased significantly.

Mildly obese people are whiter because their fat layer can produce more TGF-β 1, which inhibits the production of melanin from various channels.

Of course, the fatter and whiter it is not inevitable. Subcutaneous fat is not only used to store energy, but also an important endocrine organ. One of its functions is to convert androgen secreted by adrenal gland into estrogen.

Estrogen is closely related to skin quality. There is a certain level of estrogen in the body, which is very important for skin health, but too high estrogen will promote the formation of black, leading to black skin.

Extended data:

People can't lose weight blindly and pursue thinness excessively. If a person's height and weight have reached a relatively symmetrical state, and then blindly pursue thinness, it will break the balance of the body.

In order to minimize the cost of "weight loss blackening", we need sun protection, proper use of essence, and internal conditioning to ensure adequate sleep, exercise and diet conditioning, not picky eaters, and eat more fruits and vegetables.

In addition, sudden weight loss and excessive fat loss will lead to skin relaxation, so while losing weight, we must ensure the moisture and elasticity of the skin, so that the skin can recover its elasticity better, at least it will not look so dry.

Baidu encyclopedia-melanin