Abstract
INTRODUCTION: The psychological burden of type 1 diabetes mellitus (T1DM) is considerable. The condition affects the daily lives of adults living with T1DM (ALWT1DM) in many ways. International guidelines highlight the importance of providing psychological support to ALWT1DM to improve health outcomes and well-being. METHODS: We conducted a systematic literature review of randomised controlled trials (RCTs) to identify the evidence on the impact of psychological interventions on glycaemic control and psychological outcomes in ALWT1DM. Literature searches of Medline, Embase, Cochrane Central Register of Controlled Trials, PsycInfo, and the grey literature were performed to identify relevant RCTs, published in English, from 2001 onward. Fourteen RCTs of ten psychological interventions in ALWT1DM were eligible and included in the qualitative synthesis. The studies varied considerably in terms of duration, target population, endpoints, and efficacy. RESULTS: Overall, psychological interventions did not perform significantly better than control treatments in improving glycaemic control, although selected patient groups did report benefits from some psychological intervention types, such as cognitive behavioural therapy. Although most of the psychological interventions produced small, nonsignificant improvements in self-reported patient functioning, some treatments were effective in reducing diabetes distress and improving mental health, even if no impact on glycaemic control was observed. DISCUSSION: Current guidelines for the treatment of T1DM recommend access to psychological services; however, there is a paucity of high-quality evidence from clinical trials on the effectiveness or preferred structure of psychological support. There is a clear need for more rigorous, large-scale, international research to address the efficacy of psychological interventions in ALWT1DM.