Recently, there has been some evidence that the use of diabetes-specific formulas which tend to be lower in carbohydrates with a high glycaemic index (GI), enriched with fibre, and high in fats, especially monounsaturated fatty acids,41 may be beneficial for patients with diabetes in terms of glycaemic control, both in the long term, as measured by HbA1c, and in the short term, measuring post-prandial peak values.42 43 Furthermore, the type of anti-diabetic drugs such as GLP-1 receptor agonist which affect appetite and, thus, nutritional intake was not considered in this study. This evidence concerns the gene GLP1R and diabetes mellitus.