Short answer: They explain how it hurts your body to the point where it can kill you
Long answer: One way that organizations help prevent eating disorders is explaining how it can kill you. Most people don’t know how an eating disorder works so they explain it by describing what happens to the muscles organs and other important parts of the body. When a person skips meals for a while muscles can start to deteriorate. And eating disorder can also cause the nutrients needed to keep the organs healthy to start going away.
Note that I’m not a professional on this***