Feeding, dietotherapy and medicated diet are all terms of traditional Chinese medicine. There are both connections and differences among them, and they are all closely related to normal diet. Feeding is diet nutrition, which is to achieve the purpose of health care by regulating normal diet. Doctors of traditional Chinese medicine have emphasized the importance of diet and nutrition. "Su Wen Wu Chang Zheng Da Lun" pointed out: "Eat all the fruits and vegetables, and don't overdo it, which will hurt it." Food should be comprehensive and nutrition should be balanced, which is the core content of scientific diet. The so-called "excess", one of which refers to excess nutrition. The proportion of animal protein and fat in diet is too large, and there is too much sugar, which leads to the disaster of "civilized disease": obesity and subsequent cardiovascular diseases have become the first disease that causes death. Another meaning of "excessive" is excessive diet. "Su Wen, On the Method of Dirty Qi" points out: "Five grains are for nourishment, five fruits are for help, five animals are for benefit, five dishes are for filling, and the smell is combined to supplement the essence." A complete diet must take cereals (including beans) as the staple food, livestock as the non-staple food, vegetables as the supplement, and fruits as the supplement. Explain that a reasonable combination of various foods can help the human body to be healthy. This is consistent with the requirements of balanced diet and reasonable nutrition put forward by modern nutrition. The second essence of scientific diet is to choose and eat food reasonably according to the nutritional characteristics and taste function of food. Food hygiene is the third aspect of scientific diet. "The disease enters from the mouth" can best explain the close relationship between food hygiene and disease. Any exquisite food, if it is polluted, spoiled or eaten improperly, can become a killer drug. Scientific diet also includes a reasonable diet system and good eating habits. "Eat and drink well, live regularly", and you can "go away at the age of 100"; And "if you do what you do, you will live without restraint", which will inevitably lead to "half a hundred failures".