1, whey protein

2. Casein: protein, which accounts for 80% of milk protein, can cause gastrointestinal allergies in some people. β -lactoglobulin and γ -whey protein are only a part of whey protein.

3. β -lactoglobulin: It may cause gastrointestinal allergies in some people, but it is the most antigenic.

4.γ- whey protein

Extended data

Because milk is rich in lactose, lactose is a disaccharide, which needs lactase secreted by organisms to decompose. Most adults may lose the function of decomposing lactose when they grow up.

Mammalian larvae will naturally produce lactase, but the secretion of lactase will gradually decrease or stop after three years old. For people, different nationalities have different situations. Because ordinary nomads often feed on dairy products, they will secrete lactase for life through natural selection.

Baidu encyclopedia-milk