Suffer from obesity, lactose intolerance, milk protein allergy of the crowd to eat whole milk with caution. 1. Obese patients should not drink whole milk, 100 grams of whole milk contains about 3-4 grams of fat. If you are overweight, especially if you have hyperlipidemia and hypercholesterolemia, it is better to use skimmed milk. 2. Lactase can help the body break down and absorb lactose, but some people seriously lack lactase, lactose in milk can not be converted to glucose and galactose absorbed by the small intestine, the lactose into the large intestine, easy to make the intestinal lumen osmotic pressure, the mucosa of the large intestine so as to absorb a large amount of water, which is prone to abdominal pain, bloating and diarrhea, and other discomforts. 3. The people who are allergic to milk protein are not suitable to drink milk, otherwise it will easily lead to abdominal pain, bloody stools, skin rashes, breathing difficulties and other allergic symptoms.