I don't think there is mental illness. Because in today's society, the aesthetic standard of thinness has already occupied more and more people's aesthetic cognition, and these people who are obviously not fat but have always wanted to lose weight are pursuing slimmer bodies and making themselves more and more in line with the aesthetic standards of this new era. But fundamentally speaking, the reason why there are a large number of dieters is because most of them are not the cause of mental illness, but just for beauty. After all, everyone has a different definition of beauty.

First of all, for the vast majority of people, losing weight is not a mental illness, but simply wants to be beautiful, and there are more choices of clothes. After all, everyone loves beauty.

The trend of taking thinness as beauty is fierce, and many people are involuntarily irrigated by this idea, but sometimes they have to admit that thinness is really beautiful. Slimming down can get rid of the embarrassment when buying clothes, and can get rid of the limitations of wearing. People who are not fat may simply want to wear size M to size S, and the influence of people around them makes their pursuit of thinness stronger and stronger. And now there are more and more thin people, and the streets are full of goosenecks and long legs. In most cases, the judgment above the visual sense directly determines people's behavior.

Then, the pursuit of sensory vision is the reason why these people are not fat but have been losing weight, not mental illness. However, some people suffer from physical anxiety due to excessive pursuit of slim figure, pay too much attention to and pursue figure shaping, and even lose weight through some improper methods, such as dieting, vomiting, taking a lot of diet pills and so on. Such a method of losing weight will not only have a negative impact on human health, but even cause mental weakness, which will lead to serious physical anxiety over time.

To sum up, the vast majority of people who are not fat but always want to lose weight only pursue physical requirements, and the pursuit of beauty is not caused by mental illness.