Judi Liebowitz thinks she's fat. And she's convinced, as she confides in her diary, that she'd be happier if she were skinnier. So when Judi becomes friendly with pencil-thin, glamorous Nancy Pratt, she learns Nancy's secret and joins her in the secret binge-and-purge cycles of bulimia. Before long, Judi's life spins out of control and her obsession with food, calories, and pounds is no longer another typical eighth-grade problem—it's a matter of life and death.