A friend that lived in my suite in college had some problems with eating disorders. Her boyfriend was mentally abusive and had her convinced that, despite the fact that she was 5'6" and weighed under 110 pounds, she was fat. My suitemates I and I devoted a considerable amount of time trying to first convince her to lose the boyfriend, and then to build up her own self-esteem and self-confidence and convince her to get professional help.
It was a frightening thing to deal with, both the problems of my friend, and the very stong urge I had to kick the s--t out of her boyfriend.