If we want to classify the health care industry into five elements as a whole, then health care (functional) food is a kind of food, which has the characteristics of general food, can regulate human function, and is suitable for specific people to eat, but not for the purpose of treating diseases. Health food can not be directly used to treat diseases, but is a human mechanism regulator and nutritional supplement. It is an auxiliary product for maintaining the body and has the function of making the body healthy.