Restrictive eating disorders (EDs) are a category of disorders, defined broadly here by including any range of repeated behaviours which result in an individual significantly restricting their nutritional intake. Although the rate of diagnosed eating disorders in the general population is relatively low (Demmler et al., 2020), restrictive EDs have the highest mortality rate of any other mental disorder (Fichter & Quadflieg, 2016, Smirk et al., 2012, Steinhausen, 2002), and while EDs typically develop during the transition to adulthood, they can persist into adulthood if they go untreated (Potterton et al., 2020). The purpose of this study was to conduct a systematic review of this literature using PRISMA guidelines, on the treatment of anorexia nervosa, bulimia nervosa, and avoidant restrictive food intake disorder using three established psychological interventions (cognitive behavioural therapy, acceptance and commitment therapy and behavioural therapy). This thesis reconceptualised understandings of restrictive EDs in behavioural analytical terms by applying a functional, individual-focused lens to evaluating research in this space. Eight articles published since 2013 were identified for analysis by the search. The methodology, scientific rigor and social validity of research in this space was considered in analysis, and this thesis applied the ABA lens to understanding where and how treatments may be failing to produce socially significant, lasting results.