Milk is one of the favorite diets in people’s daily life. Its main components consist of water, fat, phospholipids, protein, lactose, inorganic salts, etc. Its nutritional composition is very high and the mineral variety is very rich. According to Chinese medicine, milk is sweet and slightly cold in nature, and is effective in quenching thirst, moistening the intestines, clearing heat and laxatives, and tonifying the deficiency and strengthening the spleen. The milk is suitable for people of all ages, but there are still some people who are not suitable for drinking milk, as follows: 1, lactose intolerant: some people have a serious lack of lactase, so that the intake of milk in the body can not be converted into galactose and glucose for absorption and use in the small intestine, but directly into the large intestine, so that the intestinal lumen osmotic pressure rises, so that the large intestinal mucosa inhaled a lot of water, in addition, lactose in the intestine by bacterial In addition, lactose fermentation in the intestine by bacteria can produce lactic acid, so that the intestinal pH value drops below 6, thus stimulating the large intestine, resulting in symptoms such as bloating, abdominal pain, exhaustion and diarrhea. 2, milk allergy: some people will have abdominal pain, diarrhea and other symptoms after drinking milk, and individual people with severe allergies may even develop rhinitis, asthma or hives. 3, reflux esophagitis patients: milk has the effect of reducing the pressure of the lower esophageal sphincter, thus increasing the reflux of gastric or intestinal fluids and aggravating esophagitis. 4, patients after abdominal and gastrectomy surgery: the lactase in the patient’s body will be affected and reduced, after drinking milk, lactose can not be decomposed and fermented in the body, producing water, lactic acid and a large amount of carbon dioxide, making the patient bloated. 5, patients with cholecystitis and pancreatitis: to digest the fat in milk, bile and pancreatic enzymes must be supplied, and milk increases the burden on the gallbladder and pancreas, making the symptoms worse. 6, iron deficiency anemia patients: iron in food needs to be converted into ferrous iron in the digestive tract before it can be absorbed and used. If you drink milk, the ferrous iron in your body will combine with the calcium and phosphorus salts of milk to form insoluble compounds, which affects the absorption and utilization of iron and is not conducive to the recovery of health of anemic patients. 7.People who are often exposed to lead: the lactose in milk can promote the absorption and accumulation of lead in human body, which can easily cause lead poisoning, therefore, people who are often exposed to lead should not drink milk, and can drink sour milk instead, because there is very little lactose in sour milk, which has mostly turned into lactic acid. 8, in addition, the elderly should not drink too much milk. Older people drink too much milk for calcium, because milk can promote the occurrence of cataracts in old age. The reason is that milk contains 5% lactose, which is easily deposited in the lens of the elderly and affects its normal metabolism, and the protein is prone to denaturation, leading to a decrease in lens transparency and triggering the occurrence of senile cataracts or aggravating their condition. It is also recommended to be taken with caution by Chinese medicine for those with spleen and stomach deficiency cold diarrhea and phlegm and dampness accumulation.