What metaphors are used in Wasted: A Memoir of Anorexia and Bulimia by Marya Hornbacher?

Lunchroom of Concord Elementary, Edina, Minnesota serves as a metaphor for peer pressure and acceptance. It is in this lunchroom that nine-year-old Marya realizes the implications of her first bout with purging. Once she has started throwing up, she feels she has to either continue to do so, or not eat at all.