If your teenage daughter or son thinks that he/she weighs too much even if he/she underweight it could be a symptom of anorexia nervosa. It is an eating disorder that is characterised by abnormally low body weight and an intense fear of gaining weight. In order to prevent weight gain a person with anorexia may severely restrict food intake go on starvation vomit after eating or exercise excessively to lose weight. Anorexia can have numerous complications such as anemia heart problems bone loss (osteoporosis) muscle loss gastrointestinal and kidney problems electrolyte abnormalities and even death. Girls with anorexia often experience