What does it mean that it is dangerous for men to be thin and women to be thin?

Being thin can make people feel beautiful, but you can't see the bones, so it's not beautiful, which makes people feel disgusting and unhealthy. Therefore, no matter how thin you are, you must look like a healthy figure. A healthy figure is the most beautiful figure. Men in the world, I believe, most want to see a healthy figure with no explicit appearance, well-proportioned figure and shiny skin. Therefore, women must pay attention to appropriateness and moderation when exercising and maintaining. Where they need to exercise, they should exercise more appropriately, and other places should also exercise moderately. Is this reasonable? In addition, they should have moderate nutrition, not gluttony, but must eat. If they need drugs and supplements to follow up, they should also follow the doctor's advice and never be greedy. Don't destroy the original ecology and natural body shape.