Four million — or one in 16 — adults in the UK have diabetes (whether or not they are aware of it), and this figure is predicted to increase to an estimated five million by 2025 (Diabetes UK, 2015). The majority have type 2 diabetes and the focus of this article will be on the role of general practice nurses (GPNs) in managing type 2 diabetes, although an overview of pre-diabetes, type 1 diabetes, gestational and steroid-induced diabetes will be provided. The author will also discuss the best current dietary advice that GPNs can provide for patients so that they can manage their own diabetes, as well as looking at the support available for GPNs to facilitate self-care in their day-to-day practice.