There won't be any. I strongly suspect tumblr puts that there because of advice from their legal department. If they facilitate pro-anorexia discussion, especially without some kind of warning, that might put them at risk for being sued by parents whose child died/was hospitalized due to anorexia, for example.  On the other hand, it seems like the probability of getting sued by fatties or parents of fatties for encouraging people to be fat and have their feet fall off is relatively slim (teehee!).