Personally, I've found that in people who have eating disorders that I know of, and I know a few one of whom committed suicide not too long ago, the eating disorder is almost always a symptom of a larger problem, like schizophrenia or bipolar. I've never run into a person that has bulimia or anorexia that was otherwise perfectly mentally healthy and stable. I realize I'm basically making an argument from personal experience here, and if someone can provide a counter-example I'll stand corrected. But it seems to me that eating disorders are an extension of a twisted self image brought on by mental illness. By trying to treat it as a disease unto itself rather than a manifesting symptom of a deeper problem, I don't think we're solving the issue.