The diagnostic consideration of the eating disorders anorexia nervosa and bulimia nervosa has been given much focus over the last two decades than previously, as clinicians have become more aware of the frequency of these disorders and the difficulties associated with their treatment. Anorexia nervosa and bulimia nervosa as known in the DSM-IV as eating disorders are characterized by physically and/or psychologically harmful eating patterns. Although the psychological explanation of what we now call anorexia nervosa have been known about for centuries, it has only recently attracted much interest, due to greater public knowledge and increased incidence (according to Gross and MclLveen 2006, the latter claim has been disputed). Most people suffering from anorexia nervosa and bulimia nervosa start by fasting. Anorexia nervosa is a deliberate self-starvation. A person whose body weight is less than expected for his or her body height and weight is considered to be anorexic. In contract, bulimia involves binge eating a large quantity of food followed by purging by self-induced vomiting, enemas, laxatives, or diuretics.