Abstract
The two theoretical models that will be presented are the Cognitive Behavioural Model (CB) and the Systemic / Family Systems Model (S/FS), as both approaches play an important role in the treatment and understanding of ED. The implications of the evidence behind these models will be discussed in relation to the current focus on evidence based practice.The focus of this discussion will be primarily on the adult population, however some of the evidence, particularly within the S/FS approach will have been drawn from an adolescent population, therefore the contrast between these groups will be discussed. The majority of ED literature is based on females due to the clinical prevalence, and the few studies based on males state that the two sexes with ED show similar characteristics (Crisp, Bums & Bhat 1986). However some differences have been highlighted (BramonBosch, Troop & Treasure 2000), therefore the implications of this will be expanded on further in relation to service delivery and provision. The CB and S/FS theoretical models will be presented individually with a critical evaluation of the theory and the evidence in relation to AN and BN. Two types of evidence will be presented, evidence derived from an experimental context providing support for the model and clinical outcome evidence providing a link between theory and practice.