"To date, more than 1365 trials have been generated by searching and over 100 trials have been evaluated in detail. Because of a relatively high number of original exclusions (n=12) the trial inclusion criteria were broadened to include those with non-blinded outcome assessment, providing 34 trials for analyses. Because of incomplete published and available data, at best up to 12 studies had data available for any single analysis. The maximum number of total patients included in a single analysis was 602. The majority of studies evaluated patients with bulimia nervosa of a purging type. The review supported the efficacy of cognitive-behavioural psychotherapy (CBT) and particularly CBT-BN in the treatment of people with bulimia nervosa and also (but less strongly due to the small number of trials) like eating disorder syndromes. CBT had been used with efficacy in group settings. Other psychotherapies were also efficacious, particularly interpersonal psychotherapy in the longer-term. Self-help approaches that used highly structured CBT treatment manuals, were promising albeit with more modest results generally, and their evaluation in bulimia nervosa approach merits further research. Exposure and response prevention did not appear to enhance the efficacy of CBT. Psychotherapy alone is unlikely to reduce or change body weight in people with bulimia nervosa or similar eating disorders."