Anorexia nervosa is an eating disorder that usually strikes women. Of the 7 million woman aged 15 to 35 who have an eating disorder, many will die from the complications of anorexia. The disease can be defined as self-starvation leading to a loss of body weight 15% below normal, accompanied with hyper activity, hypothermia, and amenorrhea. Hypothermia results when the body's natural insulation (fat stores) become non-existent and the victim becomes cold all the time. Amenorrhea is the absence of at least three menstrual cycles- this is also affected by the loss of fat stores in the body. Anorexia may not be noticed in its early stages because it often starts as an innocent diet. Often dieters become hyperactive because they exercise frantically in an attempt to burn calories to lose weight. Even in the later stages of the disease, it may no be noticed because the anorexic usually chooses to wear layered and baggy clothes. Despite the emaciated appearance of the anorexic, she still "feel fat" and wants to hide her "ugly fat body".