Scientific basis has been observed that plasma insulin levels vary in the postprandial phase as the glycemic index associated with the food. However, it should be noted that the glycemic index of a food depends not only on the amount and type of carbohydrate content in food, but also the presence of other substances (fat, protein and fiber). The main goal of this diet is to avoid sharp rises in the level of insulin in the blood and try to keep it as stable as possible. Although there are studies on the effects of food, according to their glycemic index on postprandial glucose and insulin, must be borne in mind that such studies are very limited application, since they base their research on specific foods.Extrapolation and its practical application in the diet is very limited and even questioned the scientific community. even questioned their value for diabetics (v sase consensus document of the American Diabetes Association, 2008 )