Long-term outcome of anorexia nervosa: Results from a large clinical longitudinal study

Abstract

Objective: Assessment of the long-term outcome of anorexia nervosa (AN) in a very large sample of inpatients (N = 1,693) and identification of predictors for poor outcome.

Method: Over 25 years (mean 10 years), consecutively admitted inpatients of a specialized hospital were followed. A subsample of 112 patients with 20-year follow-up was defined. Bivariate comparisons and logistic regression analysis identified risk factors of poor outcome.

Results: Body mass index (BMI) increased during the follow-up period. Eating behavior as well as general psychopathology improved but did not reach the level of healthy controls. Remission was found in 30% (total sample) and in 40% (20-year follow-up subsample). Crossover from AN to binge-eating disorder or obesity was rare. The predictors of a negative course of illness included lower BMI at admission; a higher score on the Eating Disorder Inventory Maturity Fears subscale at admission; fewer follow-up years; and higher age at admission. The main diagnostic crossover occurred from AN to eating disorder not otherwise specified. Motherhood was related to better outcome.

Discussion: Many patients with very severe AN recover from their illness but AN also shows considerable long-term negative consequences. Over long time periods, survivors show improvement but better treatments for severe cases are still needed. Predictors of outcome included symptom severity, chronicity, and length of follow-up but not psychiatric comorbidity.

Keywords: anorexia nervosa; course; eating disorders; long-term; mortality; outcome.