Anorexia nervosa is one of many types of eating disorders that is influenced by the media, diet programs, low-carbohydrate and fat-free foods, and the obsession with being thin. These influences make the person insecure, tense and narrow-minded. Anorexia nervosa occurs when a person exhibits an abnormal eating pattern and loses a lot of weight, usually fifteen percent of their body weight. It is also a complicated mixture of emotional, psychological and physical changes, it is often called “the hunger disease” or “the dieter's disease” (Kirkpatrick). The disease is not a recently discovered medical problem. The causes of the disease were documented at least three years ago by an English doctor named Thomas Morton. According to Morton, he considered the disease “nervous consumption” and believed it was caused by “sadness and worry.” He used the term “wasting” to describe the heavy weight, and called it “nervous” because he could not explain the severe weight loss (Kirkpatrick). To be diagnosed with the disease of anorexia nervosa, the person's weight must be at least fifteen percent. smaller than normal for your height and age. The person has a great fear of becoming overweight and has an image that their body is overweight when in reality they are underweight and/or refuses to admit that weight loss is a serious problem. And an important medical criterion for women in the diagnosis of the disease is the absence of at least three or more consecutive menstrual periods (Kirkpatrick). The onset of the disease often follows some stressful events that have occurred in the person's life. Low self-esteem is often the cause of these stresses. Most anorexic people start on some form of diet to lose weight. When weight loss becomes visible to one's own eyes and those of others, the person begins to enjoy his or her special ability to master hunger and control one's life, continuing to diet without realizing the emotional and physical consequences. changes it is causing to his body and mind. And that's how most people diagnosed with the disease became anorexic (American). The facts about anorexia nervosa and diet are that full-blown anorexia nervosa is a rare disease and only about ten percent of cases occur in men. It is limited to the developed world because anorexia is mostly unknown in developing countries.