Body Dysmorphic Disorder (BDD) - Obsessed with imaginary defects in their appearance.
Bulimia- Emotional disorder involving distortion of body image and an obsessive desire to lose weight.
"Bulimia nervosa is characterized by frequent episodes of binge eating followed by inappropriate behaviors such as self-induced vomiting to avoid weight gain. DSM-5 criteria reduce the frequency of binge eating and compensatory behaviors that people with bulimia nervosa must exhibit, to once a week from twice weekly as specified in DSM-IV."
"The only change to the DSM-IV criteria for bulimia nervosa is a reduction in the required minimum average frequency of binge eating and inappropriate compensatory behavior frequency from twice to once weekly. The clinical characteristics and outcome of individuals meeting this slightly lower threshold are similar to those meeting the DSM-IV criterion."
Medicines such as antidepressants and Psychological counseling.
Joan Rivers does have Bulimia because her disorder meets the criteria of the DSM 5, which is an eating disorder to lose weight.