"People take food as the sky, and food is safety first." From ancient times to the present, the relationship between diet and health is very close. Some famous doctors at all times and all over the world also pay great attention to diet health. Sun Simiao, a famous doctor in the Tang Dynasty, once said: "If you want to cure all diseases, you should use diet therapy first, that is, if you fail to recover, you still have to use medicine." Hippocrates, the father of western medicine, once said, "Food is used as medicine, and diet should be the first choice for medical treatment."