Milk is a common nutritional drink in daily life, rich in a variety of nutrients, such as a variety of vitamins, proteins, and minerals, can effectively strengthen the bone, nerve nutrition, delay aging, but milk is not suitable for all people, and not in any case are suitable to drink, need to be noted. 1, allergies: allergic to milk or allergic to some components of milk, can not drink milk and cow milk products to avoid allergic symptoms. The first thing you need to do is to take a look at the product. Allergic people are also not recommended to drink milk, which may lead to the aggravation of allergy symptoms; 2, gastrointestinal dysfunction: milk can reduce the pressure of the esophageal sphincter and increase the reflux of gastric or intestinal fluids. Gastrointestinal disorders need to avoid drinking milk to avoid aggravating diarrhea or vomiting; 3, fasting: milk contains a lot of protein and water, drinking milk on an empty stomach is not conducive to protein absorption, and excess water tends to dilute stomach acid, so it is not recommended to drink milk on an empty stomach, and can be eaten with bread. Milk needs to be heated for as long as possible, multiple times, and excessive heating of milk can lead to the destruction of various nutrients and reduce the nutritional value. It is also not recommended to drink raw milk, as raw milk contains a large number of bacteria, which can easily lead to intestinal bacterial infections.