Milk contains protein, calcium, lactose, vitamin A, vitamin D, etc. It has high nutritional value, but some people will have diarrhea when drinking milk, which may be caused by drinking milk on an empty stomach, lactose intolerance, allergy to milk, drinking spoiled milk and digestive system diseases.

1, drink milk on an empty stomach: drinking milk on an empty stomach is easy to promote intestinal peristalsis, and it is too late for milk to be digested and absorbed, which leads to diarrhea. Try to avoid drinking milk on an empty stomach;

2, lactose intolerance: some people lack lactase or the activity of lactase is reduced, which will lead to lactose malabsorption, undigested lactose in the intestine will produce gas, cause abdominal distension, and also increase the osmotic pressure in the intestine, which will lead to more water flowing into the intestine, causing diarrhea;

3. Allergy to milk: Some protein in milk may be regarded as antigens by the body, causing allergic reactions. After drinking milk, the body may have symptoms such as itchy nose, sneezing, nausea, vomiting and diarrhea. People who are allergic to milk should avoid ingesting milk and dairy products;

4. Drinking spoiled milk: If you accidentally drink spoiled milk, you may have symptoms such as nausea, vomiting, abdominal pain, abdominal distension and diarrhea;

5, digestive system diseases: such as irritable bowel syndrome, spleen and stomach weakness people should not eat cold food, drinking cold milk may cause diarrhea, it is recommended to drink warm milk.