Diabetes mellitus affects about 830 million people worldwide, with 2.5 million diabetes-related deaths per year. The estimated prevalence of diabetes among psychiatric in-patients in the UK is 10%, and the increased risk of poor diabetes-related physical health outcomes among people with a severe mental illness (SMI) is detrimental to their mental health and social functioning. This article uses two fictitious case vignettes inspired by experience in an in-patient psychiatric facility to explore the challenges of managing diabetes in this setting in the UK. The relationship between psychiatric disorders, their symptoms and management of physical health conditions, including health promotion, monitoring and pharmacological therapy, creates a challenge in the optimal management of diabetes. Recommendations for improving diabetes management in people with SMI are divided into those requiring insulin and those not requiring insulin.
