Raw milk is not recommended mainly because it contains a lot of bacteria and food safety is not guaranteed. Raw milk in life generally refers to the milk just milked from the cow, without sterilization, there may be salmonella, brucella and other bacteria, if consumed directly, the bacteria into the digestive tract, diarrhea, abdominal pain and other symptoms. In addition, the container that holds the milk may also have bacteria, so it is generally not recommended to drink raw milk directly, it is generally recommended to drink after ultra-high-temperature instantaneous sterilization or pasteurization of milk, which can preserve the nutrients, but also can kill the bacteria. Although raw milk has some nutrients, milk that has not been sterilized is less safe, so it is not recommended to drink raw milk directly.