Pure milk also contains sugar, but contains lactose, does not contain artificial added sugar, such as: sugar, sucrose, etc.; pure milk in the lactose content of the season, feed and other factors, but the specific lactose content is not much difference. Lactose is a carbohydrate that not only provides energy for the body, but also promotes the growth and development of infants and young children. Lactose is broken down into glucose and galactose in the intestines, and glucose is mainly used to provide energy needs for the consumer. Some people after drinking pure milk bloating, diarrhea and other phenomena, may be due to lactose intolerance, mostly because the milk into the human body, the body can not be completely broken down, absorption of lactose, there will be more digestive abnormalities, and this situation requires a whole diet structure.