In children a BMI for age percentile of less than the 5th percentile is often used.
Treatment of anorexia involves restoring a healthy weight, treating the underlying psychological problems, and addressing behaviors that promote the problem.
A person with anorexia nervosa may exhibit a number of signs and symptoms, the type and severity of which may vary and may be present but not readily apparent.
Other psychological issues may factor into anorexia nervosa; some fulfill the criteria for a separate Axis I diagnosis or a personality disorder which is coded Axis II and thus are considered comorbid to the diagnosed eating disorder.
Often they weigh themselves frequently, eat only small amounts, and only eat certain foods.Some will exercise excessively, force themselves to vomit, or use laxatives to produce weight loss.