Context Anorexia nervosa (AN) is a serious mental illness with marked morbidity and
mortality. Objective To explore the prevalence, heritability, and prospectively assessed risk
factors for AN in a large population-based cohort of Swedish twins. Design During a 4-year
period ending in 2002, all living, contactable, interviewable, and consenting twins in the
Swedish Twin Registry (N= 31 406) born between January 1, 1935, and December 31,
1958, underwent screening for a range of disorders, including AN. Information collected …