eating disorder; severe weight loss accompanied by obsessive worrying about weight gain despite the fact the person is 10-15% below normal body weight; symptoms include: absence of 3 menstrual periods (females), distorted body image, intense fear of weight gain, dull eyes, baggy skin, dull hair, sallow skin, listlessness, overexercises, obsession about amount of food eaten; Onset: early adolescence, more white middle-class females; often comorbid with OCD