Moderate consumption of xylitol is not harmful to the body, while excessive consumption is harmful to the body. Xylitol is usually used to make sugar substitutes for diabetic patients, and its metabolism in the body does not require the participation of insulin, i.e., it can replenish calories and improve glucose metabolism without increasing the blood glucose concentration. But xylitol calories and glucose similar to excessive consumption of xylitol, will release too many calories, can not be consumed calories will be converted to fat, stored, thus leading to weight gain, long-term can lead to obesity. Obesity can cause elevated blood lipids, elevated blood lipids can be deposited in blood vessels and cause atherosclerosis, atherosclerosis is a risk factor for cardiovascular and cerebrovascular diseases, so excessive consumption of xylitol is harmful to the body.