The ancient concept of diet and nutrition is based on the appropriate and inappropriate, that is, the appropriate and contraindicated aspects. As Zhang Zhongjing, a great physician of the Han Dynasty, said, “The taste of food is appropriate for disease and harmful to the body. If it is appropriate, it will benefit the body, and if it is harmful, it will become a disease.” Later generations of physicians embraced this view and played it up. For example, Sun Simiao, a Tang Dynasty physician, said, “The essence of health must be funded by diet, and those who do not know what is appropriate to eat are not enough to survive.” Therefore, the evaluation of the nutritional value of food, whether it is used for dietary supplements or dietary therapy, should not start from whether it is rare, strange, famous, expensive, but should focus on the use of the appropriate. The desirability and contraindications of diet are reflected in the body type, region, season, age, condition, as well as dietary preparation, usage and dosage. According to the physiological performance of the human body, Chinese medicine physical theory that people have different types of temperament. Such as thin, mobile, irritable “wood fire”; fat, lazy, sleepy “phlegm damp”; white face, cold limbs, cold “Yang deficiency” and so on. For different body types, their dietary content is appropriate, avoid. For example, “wood fire”, should be fruits, vegetables, cereals, beans and other light nature and milk, eggs and other moist food is appropriate, while beef, mutton, dog meat, scaleless fish, strange birds and animals, raw seafood and spicy fire-boosting nature of the food is contraindicated. For “phlegm-damp” people, light or moist foods such as fruits, vegetables, cereals and beans are appropriate, while fatty meat, milk, oil and other fatty, phlegm-producing and moist foods are contraindicated. “Yang deficiency” people, fish, poultry, meat, eggs, moderate amount of pungent and warm food is appropriate, while cold meat, cold drinks, a lot of fruits and vegetables are contraindicated. Generally located in high cold, cold and wet areas, should be pungent warm, pungent heat, help fire, Yang food, such as the right amount of star anise, fennel, pepper and other spices and chili peppers, mutton, venison, dog meat, etc. is appropriate, while the cold nature of the food, such as oat, buckwheat, bitter melon and cold drinks, cold meat, etc. is contraindicated. In warm, hot and humid areas, should be pungent, sweet and cold, sweet and cold nature of food, such as fruits, vegetables, cold food, cold drinks, cold meat, river food, etc. is appropriate, while spicy, fire, tonic Yang food is contraindicated. The four seasons of the diet, as early as 2000 years ago in the book “Zhou Li – Tian Guan” made specific instructions, such as that the summer sweating, should eat more soup-type food, winter more cold, should be appropriate more spicy drinks, etc.. China’s different ethnic food flavor, is with the climate, the region, and even with their own physique is a certain relationship. The so-called “South sweet”, “North salty”, “East spicy”, “West acid” flavor is with the physiological and environmental requirements Inseparable. Traditional Chinese medicine advocates that the dietary preferences and contraindications are different for different ages. Children, according to Chinese medicine, are delicate “pure yang body”, so avoid eating spicy, hot, tonic, warm, Yang and fatty food. For example, the only child in the current emergence of excessive consumption of milk, chocolate, royal milk, fish, meat, eggs, poultry and other foods that lead to obesity, loss of appetite, indigestion, and even endocrine system disorders. In Chinese medicine, it is believed that “Yin is often insufficient and Yang is always in excess”. Clinical manifestations are dry mouth, dry tongue, thirst, dizziness, redness, irritability, anxiety, numbness of limbs, body tremors, constipation and so on. Therefore, the diet should also be light, tonic is also appropriate to eat milk, eggs, soybean products, such as flat tonic, clear tonic products, while mutton, dog meat, sea shrimp, deer fetus, deer antler, ginseng, and a variety of “whip wine” for the elderly without special disease is contraindicated. The disease diet is more complex. Generally speaking, according to the condition of cold, heat, deficiency, real, the choice of diet should also be cold, hot, warm, cold, lift, diarrhea and other different. Proper is appropriate, improper is contraindicated. The famous book of Chinese medicine “Yellow Emperor’s Classic of Internal Medicine” has the rules of “Eat and drink in moderation” and “Be careful and five tastes”. This is also what Chinese medicine nutrition has been adhering to. The former requires that the content and dosage of the diet should be restrained, not to be arbitrary gluttony; the latter requires that the content of the diet should pay attention to the deployment, to prevent the content of a single or partial food. This is also an important aspect of achieving dietary taboos. Five fruits “Nei Jing” also has a sentence that says: “diet, hot do not burn, cold do not Cangzhou, cold and warm in the appropriate.” Just pay attention to the dietary recipes of various ethnic groups, it is not difficult to find that the previous people in the food ingredients blended by yin and yang, hot and cold to balance the influence of the theory of yin and yang, therefore, the cold nature of fish, shrimp, crab is often blended with warm onions, ginger, garlic. Stir-fried bitter gourd with chili, mixed with cold spinach is often accompanied by mustard is also the reason. Some young men and women in life to eat cold drinks and melon seeds, candy and other snacks, or favor a single food, such as over-eating greasy, green onions, garlic, chili peppers and other spicy products, are also contraindicated by Chinese medicine. As for the excessive pursuit of a light diet, a diet dominated by vegetables, fruits and limited rice and noodles, is also opposed by Chinese medicine. At present, the clinical diet due to long-term fat, protein and sugar foods, and caused by hypoglycemia and other malnutrition is not uncommon. Five animals to do the right diet, moderate nutrition, “Nei Jing” on the text can be used as a reference for a comprehensive diet: “five grains for nourishment, five fruits for help, five animals for benefit, five dishes for the full, the smell together and served to replenish the essence.” In a word, there are strong, weak, strong and decaying human constitution, and there are deficiency, actual, cold and hot diseases. No matter what diet you choose in your daily life, as long as it suits your constitution and condition, it is a good diet.