"This literature search revealed only six randomised controlled trials investigating the use of family therapy in the treatment of adolescents with anorexia nervosa, and these all had small sample sizes. Some, but not all, of these trials suggest that family therapy may be advantageous over individual psychotherapy in terms of physical improvement (weight gain and resumption of menstruation) and reduction of cognitive distortions, particularly in younger patients. Due to the small sample sizes and the significant risk of bias (particularly information bias) in some of the studies the evidence in favour of family therapy over individual therapy is weak. In the future, larger randomised controlled trials with long term follow-up are required to assess whether family therapy is the most effective treatment for anorexia nervosa in adolescence."