The transdiagnostic theory of eating disorders: Investigation of maintaining mechanisms and clinical utility

This thesis empirically evaluated the transdiagnostic theory of eating disorders, with a specific focus on four mechanisms which, in addition to core maintaining processes, have been hypothesised to significantly contribute to the maintenance of eating disorder pathology for some individuals. Interpersonal Problems and Mood Intolerance were shown to be predictive of treatment outcomes, and Clinical Perfectionism and Core Low Self-Esteem were found to significantly contribute to the severity of eating disorder pathology. A group version of the individual treatment based on the transdiagnostic theory (Enhanced Cognitive Behaviour Therapy) was trialled and found to be effective at reducing eating disorder pathology.