I must admit that when I first started losing weight I was pleased. I dropped from a pudgy hundred and twenty-five down to one-eighteen in a month, and kept on going. One hundred and five, and my breasts disappeared. By the time they hauled me off to the Sanatorium, a feverish, weepy, ninety-pound weakling, I was out of love with elegant bones and scared that I was coming out through my skin. A teenager in the 1970s, Gwen is stuck...