Hehe, because if people are fat (only if they are taller than themselves), there will be a burden inside their bodies.
Think about it, you feel tired when you have a burden, not to mention the five zang-organs temple where you can't see the sun. ...
Being fat is bad for the heart, liver, etc. This is for health.
Talk about other aspects.
The first is the image problem. Needless to say this ~ ~
Economically. People I know are fat for two reasons: gluttony and endocrine disorders. Whatever the reason, it takes time, energy and even money to get rid of excess weight. Endocrine must spend money to find someone to regulate ...; Greed is absolutely easy to solve. Just watch your mouth. ...
Hehe, but not too thin. Being too thin is bad for your health, even worse than being fat. ...
Generally speaking, health is a question of "degree".