is an illness that mainly affects adolescent girls. The most common features are loss of weight and a change in behavior. The weight loss may become severe and life threatening. The personality changes will be those of increasing seriousness and introversion and an increasing tendency to become obsessional. She will usually begin to lose contact with her friends. She will regress and appear to lose confidence. She may become less assertive, less argumentative and more dependent. is an illness of several causes. The weight loss that trigge ....