Commonly known as anorexia, anorexia nervosa is an eating disorder in which people have an intense fear of gaining weight and a distorted perception of body image, which can lead to severe and life-threatening weight loss. Although most commonly seen in adolescent females, anorexia nervosa also occurs in males and in older women. People with the condition obsessively restrict the amount of food they consume and control their calorie intake by vomiting after eating or by misusing laxatives, diuretics or enemas. They may also exercise excessively in order to lose weight. The thing about anorexia nervosa is that no matter how much weight they lose, they are still consumed by the fear of gaining weight.