The word "Tao" refers to the meaning of method. Li Shizhen, a medical scientist in the Ming Dynasty, said: "Eating and drinking is also the lifeblood of people." . The ancients believed that diet could nourish people's qi and blood. After the human body ingests food, the essence of grains will be sufficient, the blood will be vigorous, and the bones and muscles will be strong. In the human body, yin and yang run and the five elements coexist because of the role of diet. After the diet enters the human body, it will be full of grain gas, and when the grain gas is full, it will be full of blood gas, and people with strong blood gas will be strong. The ancients also believed that the spleen and stomach were inherited by the spleen, and stomach qi should be the foundation all year round. Subject is spirit, spirit is essence, essence is qi, and qi is food. Getting qi from diet, nourishing essence and blood with qi, nourishing essence and blood with qi, and preserving the body after being full of qi are all interactive, so food is called the day of the people and the foundation of the living. Sun Simiao, a great doctor in the Tang Dynasty, said, "We have to eat to survive, but we don't know whether we can eat successfully. I don't know, fire and water don't invade. That's all. Because of the leisure of pen and ink, I wrote the article "Five Taste Gains and Losses" to enlighten the childlike innocence and be diligent in doing it, such as influencing the ear. " & lt 1 & gt； He also said: "The foundation of life must be funded by food; ..... those who don't know what to eat are not enough to survive. " Hu Sihui, a court physician in the Yuan Dynasty, said: "Ancient saints were treated before they got sick, so they paid more attention to food than goods and took things from them." & lt 1 & gt； Modern medicine also believes that diet is the fundamental condition for maintaining human life activities and is very important for personal health. Proper diet can absorb various nutrients and prolong life, and improper diet is also the cause of disease and longevity. Therefore, it is not enough to consider the food problem only from the taste, and people should pay attention to it.