The glycemic index (GI) of food is the ability of a food to cause a rise in blood glucose in humans. High GI food, after entering the gastrointestinal tract, has fast digestion, high absorption rate, fast glucose release, and high peak glucose into the blood, which means high blood glucose rise; low GI food, after staying in the gastrointestinal tract for a long time, has low absorption rate, slow glucose release, low peak glucose into the blood, and slow fall, which means low blood glucose. Therefore, using the food glycemic index to reasonably arrange meals is beneficial for regulating and controlling human blood sugar. Generally speaking, if half of the food is replaced from high glycemic index to low glycemic index, the effect of blood sugar can be improved significantly. When the glycemic index is below 55, the food is considered as low GI food; when the glycemic index is between 55 and 75, the food is medium GI food; when the glycemic index is above 75, the food is high GI food. The glycemic index of diabetic diet therapy 1.Concept The glycemic index is the ratio of the effect of a certain food to the effect of standard food (usually glucose) to raise blood sugar, which refers to how much blood sugar reaction will be caused by the human body after consuming certain food. 2.Use (1) guide diabetic patients to choose food (2) proper weight control (3) control the incidence of chronic diseases 3.Comparison Compared with the traditional food exchange method, the glycemic index method is a more scientific new method of food selection, and the research results show that the fasting blood glucose, 2-hour postprandial blood glucose and glycated hemoglobin of the patients who received the education of glycemic index are significantly lower than those who received the traditional food exchange method. The results showed that fasting blood glucose, postprandial 2-hour blood glucose, and glycated hemoglobin were all significantly lower in patients who received GI education than those who received traditional food exchange method. Firstly, the total calorie standard of daily diet should be set by referring to the Chinese Dietary Guidelines or under the guidance of a nutrition doctor; then, the daily recipes should be arranged specifically; finally, when choosing a specific food, the glycemic index of food should be referred to and more foods with low glycemic index should be consumed