Abstract

Diet is fundamental in the aetiology and management of type 2 diabetes. The optimal diet remains unclear and the EASD and ADA have recently adopted increased flexibility with dietary composition, whilst maintaining a focus on reduced energy, reduced saturated fat and increased dietary fibre. This review draws three conclusions on the current evidence for three dietary approaches; high protein diets, very low carbohydrate diets and the Mediterranean diet, specifically for the management of weight, glycaemic control and cardiovascular risk in patients with type 2 diabetes. First, unless energy intake is reduced below energy expenditure over a sustained period of time, weight loss will not occur. Second, weight loss achieved with any dietary approach over the long-term is modest, though compared with the natural history of weight gain in obesity is clinically important. Third, the evidence supports flexibility in dietary composition with no approach superior to another for weight loss, glycaemic control or cardiovascular risk management. Most importantly there is evidence that adherence to any given dietary approach is more important than the macronutrient prescription. So the best diet for those with type 2 diabetes is the one that works for them, and critically the one that they can maintain in the long term.

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