Family Therapy for Anorexia Nervosa (FT-AN) is the first line treatment for adolescents with anorexia nervosa in the UK. However, research suggests between 10 and 40% of young people have a poor outcome. For those for whom FT-AN alone is not effective there is a clear need to develop additional treatments. This paper describes the effectiveness of an additional treatment for adolescents who had not responded to FT-AN, the Intensive Day Treatment Program (ITP) embedded within a comprehensive outpatient service at the Maudsley Hospital.