The most important point in treating diabetes is to control blood sugar, and after meals is when a person’s blood sugar is most likely to rise, so diet control plays a pivotal role in treating diabetes. For diabetics, many people know that they should not eat sugar because after eating foods with high sugar content, their blood sugar will rise very quickly, leading to uncontrolled blood sugar. But in addition to foods with high sugar content, doctors will also instruct diabetics that foods like doughnuts and japonica rice should also not be eaten, and why is that? The dietary control of diabetes is not only to limit the amount of food eaten and prevent the rise of blood sugar due to excessive energy intake, but also to avoid eating foods with high glycemic index, most of which are high in sugar. Like those foods with high sugar content, we will be digested soon after eating them, and the gastrointestinal tract is also very efficient in absorbing their energy, so that the glucose sugar content in the blood increases steeply, and the blood sugar of diabetic patients is thus out of control. At the same time, these types of foods are often also not easy to produce a sense of satiety, with the role of promoting appetite, is also one of the reasons for the loss of blood sugar. The opposite is true for those with a low glycemic index. The glycemic index of a food should not be judged only by its sweetness, but by the difficulty of digesting its main components, etc. A comprehensive judgment should be made. For example, although lactose is sweeter than white rice, the glycemic index is higher than lactose because white rice is mainly composed of carbohydrates, which are easily digested and absorbed and broken down into glucose. Therefore, when judging whether a food is suitable for them, diabetic patients should not judge from past experience alone, but should consult with professionals or learn professional knowledge about it.