Xylitol, fructose and glucose are all carbohydrates. They all have the same function in the body and can generate heat. Each gram of xylitol and fructose can generate 4 kilocalories. However, the effect on blood sugar of diabetic patients after eating is less than that of glucose. Xylitol, fructose and glucose are monosaccharides and can be directly absorbed. But the absorption of xylitol and fructose is slower than that of glucose. If the absorption rate of glucose is 100%, the absorption rate of fructose is 43% and the absorption rate of xylitol is only 15%. Eating too much is easy to have diarrhea. Therefore, diabetic patients with good blood sugar control can eat a certain amount of xylitol and fructose, but not more.