I do feel sympathy for extremely skinny entertainers (or any other skinny people) who are labeled anorexic when they are in fact healthy. But would an entertainment industry filled with healthy people who are naturally super-slim really be any better? We'd still have huge numbers of people anchoring their self-perception on a tiny subpopulation with the genetic programming to have this unusual body type, as well as the time to work developing it. Most people would still have to be anorexic to look like that, and so the damage would be nearly the same.

note: I don't mean to place all blame for eating disorders on the media; there are obviously biochemical and evolutionary factors as well, and the media only represent a portion of the social contributions in play.