ABSTRACT Objectives Diabetes is a non-communicable disease where the patient’s glucose level in the blood is too high. Diabetes is prevalent among ethnic minority groups in the United Kingdom (UK). Type 2 diabetes is a major cause of premature mortality in England. Unfortunately, the lifestyle of these minority groups has become a barrier to diabetes healthcare treatment. The timely intervention of programmes targeting risk factors associated with diabetes may reduce the prevalence of diabetes among these ethnic minority groups. This review critically explores and identifies barriers that hinder specific African-Caribbean groups from accessing diabetes healthcare and how nurses can promote lifestyle changes in patients with prediabetes from African-Caribbean backgrounds. Design An extended literature review (ELR). The process consisted of a search of key databases and other nursing and public health journal articles with the keywords defined in this extended review (prediabetes, diabetes, lifestyle of Afro-Caribbean). Thematic analysis is then applied from a socio-cultural theoretical lens to interpret the selected articles for the review. Results Three main barriers were identified: (a) the strong adherence to traditional diets, (b) a wrong perception about diet management and (c) ‘Western medication’ as a key barrier that hinders effective diabetes management in ethnic minorities, including the African-Caribbean in the UK. Conclusion To address these barriers, it is important for policymakers to prioritise well-tailored interventions for African-Caribbean groups as well as support healthcare providers with the requisite capacity to provide care.