Our daughter experienced a sudden and very dramatic onset of the mental disorder known as anorexia nervosa: She became like another person almost overnight, and then lost 30% of her body weight in three months. Shocked and horrified, we responded just as feverishly -- scouring the Internet for resources, reading every book and article we could find, attending parent support groups, and seeking advice from experts. Unfortunately, our desperate efforts couldn't keep pace with her illness, and many decisions had to be made before we fully understood or knew how to deal with it. Those decisions...