Dietary advice is fundamental to the management of diabetes. Although ideally such advice should be delivered by a state-registered dietitian, it is more usually delivered by other health professionals. The primary focus for those with type 1 diabetes is carbohydrate counting and insulin adjustment and for the majority of people with type 2 diabetes, weight management is key. Patient-centred care is emphasised for the delivery of dietary advice. It is widely recognised that knowledge alone is not sufficient to induce behaviour change and practical approaches to a variety of behavioural interventions are discussed.