Describe what anorexia nervosa and bulimia nervosa are in terms of their prevalence, symptoms, who is most likely to get them, and treatment.

Anorexia nervosa is a serious eating disorder associated with an intense fear of weight gain and a distorted body image. About 2.9% of adolescent girls, and .1% of adolescent boys suffer from this disorder, and 90% of those are upper- and middle-class White females. Symptoms include refusal to maintain body weight at or above a minimal normal for age and height, along with the previously identified symptoms. Bulimia nervosa is an eating disorder characterized by binges of eating followed by self-induced vomiting, and may not be accompanied by a lower than normal weight, but body shape and weight excessively influence the person's self-image. One to two percent of adolescent females suffer from the disorder, and upper- and middle-class White women are again at the highest risk. Anorexia and bulimia are notoriously hard to treat, and there is considerable disagreement on the most effective approach to therapy. Research suggests multimodal treatment approaches may be most effective.