This is the protocol for a review and there is no abstract. The objectives are as follows:
1. To evaluate the efficacy of family therapy compared with standard treatment and other treatments
2. To investigate the relative efficacy of different forms of family therapy (see section below on 'Types of Interventions')
3. To investigate the efficacy of family therapy in patients with chronic AN vs non-chronic AN
4. To investigate the efficacy of family therapy in adolescents with AN compared to adults with AN.