Anorexia nervosa is a psychiatric disorder characterized by abnormal eating behavior, severe self-induced weight loss, and a specific psychopathology such as Body weight willfully maintained below normal level, Abnormal perception of body morphology, Intense fear of weight gain.Anorexia nervosa occurs in 0.2% to 1.3% of the general population, with an annual incidence of 5 to 10 cases per 100,000 persons. By Adolescence to young adulthood is the predominant age. Mean age of onset is 17 yr. Approximately 0.5% to 1% of college-aged women have anorexia nervosa. Workup