Diet is an indispensable condition for providing nutrition for the body, maintaining human growth, development and even ensuring survival. In the long-term practice, the ancient health care physicians and doctors in China realized that people can ensure their health and prolong their life as long as they can choose the right food for conditioning according to their own needs. Traditional Chinese medicine (TCM) has always emphasized the aftercare of diet and attached importance to the health care function of diet, believing that "dietotherapy is the foundation of body treatment", that is to say, proper aftercare of diet can make the body healthy and prevent diseases. In the Tang Dynasty, "Thousands of Women Treat Fang" pointed out: "The foundation of peace of mind must be food. Those who don't know what to eat are not enough to survive. " Eating according to syndrome differentiation is one of the characteristics of traditional Chinese medicine dietotherapy, and diet maintenance should also follow this principle.