1. Refusal to maintain the body weight over a minimal normal weigh for age and height. A weight loss leading to maintenance of body weight less than 85% of that expected inlcuding the expected weight gain during the period of growth.
2. An intense fear of gaining weight or becoming fat, even though underweight.
3. A disturbance in the way one's body weight of shape is percieved.
4. Amenorrhea, or the absence of at least 3 consecutive menstrual cycles in normally menstruating females.
Individuals with Anorexia Nervosa may be of the bing-eating/purging type, engaging in binge eating or purging behavior, such as self-induced vomiting or misuse of laxatives, diuretics and enemas. The restricting type does not engage in such behavior.