Chinese dietotherapy pays attention to the different tastes and functions of food, that is, it regulates the qi, blood, yin and yang of human body with the advantage of food taste, strengthens the body's resistance and eliminates evil spirits, so as to achieve the purpose of keeping yin and yang secret and treating the spirit. The nature of food refers to four natures, namely, cold, hot, warm and cool. Cool and cold, warm and hot, have certain similarities in function. Only the role size is slightly different. In addition, some foods have a peaceful diet, which is called blandness. Foods that can relieve or eliminate heat syndrome are cold in nature; Foods that can relieve and eliminate cold syndrome are warm. It is generally believed that cold food has the functions of clearing away heat, purging fire and detoxifying, and is often used for fever. Most warm foods have the functions of warming middle warmer, supporting yang and dispelling cold, and are often used for cold syndrome. Vegetarian dishes have the functions of strengthening the spleen, appetizing and nourishing the body. Warm foods are: ginger, onion and coriander, which are suitable for colds, fever, aversion to cold, runny nose and headache; Dried ginger and black tea suitable for abdominal pain, vomiting and hot drinks; Suitable for chilli and wine with symptoms such as chills in limbs, chills and rheumatic joint pain. Sexual food includes: rice, soybean, black sesame, peanut, potato, Chinese cabbage, cabbage, carrot, onion, auricularia auricula, lemon pork, theme, egg, carp, crucian carp, loach, yellow croaker and pomfret in fish. In addition, the milk we drink in our daily life is also a flat food. Cold foods include buckwheat, corn, white radish, wax gourd, mushrooms, celery, lettuce, rape, oranges, apples and so on. Cold foods include: millet, mung beans, kelp, mung bean sprouts, bitter gourd, tomatoes, cucumbers, bananas, watermelons, melons and so on. 1. Alkaline foods contain more metal elements such as sodium, potassium, calcium and magnesium. It should be understood that all sour fruits and bean products are alkaline foods, not acidic foods, and alkaline foods are considered to have cosmetic effects. Tofu, milk, celery, potatoes, bamboo shoots, mushrooms, carrots, kelp, mung beans, bananas, watermelons, strawberries and most fruits and vegetables are alkaline. The acidity and alkalinity of food will affect the bodybuilding of body and skin. The identified weakly alkaline foods are: bean curd, pea, soybean, mung bean, rape, celery, sweet potato, lotus root, onion, eggplant, pumpkin, cucumber, mushroom, radish, milk and so on. Alkaline foods include spinach, cabbage, cabbage, lettuce, carrots, bamboo shoots, potatoes, kelp, oranges, watermelons, grapes, bananas, strawberries, millet, persimmons, coffee and wine. There are also some foods that are mistaken for acidic foods because they taste sour, such as wild vegetables, tomatoes, vinegar and so on. In fact, these things are typical alkaline foods. Eat more alkaline food. It is found that eating more alkaline food can keep the blood weakly alkaline, reduce the acidic substances such as lactic acid and urea in the blood, and prevent them from depositing on the tube wall, thus softening blood vessels. So some people call alkaline food a cleaner for blood and blood vessels. The pH mentioned here is not the nature of the food itself, but the nature of the elements left in the body after digestion and absorption. Common acidic elements are nitrogen, carbon and sulfur. Common alkaline elements are potassium, sodium, calcium, magnesium and so on. Some foods taste sour, such as tomatoes and oranges, but they are all strongly alkaline foods, because the last element after their metabolism in the body is potassium. 2, acidic food acidic food refers to inorganic salts that can form acids in the human body, such as phosphorus, sulfur, chlorine and other elements, which can make body fluids acidic. Common foods include meat, fish, poultry, eggs, peanuts, hazelnuts, walnuts and hard fruits in protein. Specifically: pork, beef, chicken, egg yolk, carp, eel, dried squid, shrimp, rice, flour, bread, barley, beer, asparagus and so on. Although you lack acidic food in your body, you can't just supplement it, because medicine has proved that when we eat a lot of acidic foods such as chlorine, sulfur and phosphorus, it is extremely difficult for our blood to maintain a weak alkaline state and it is prone to acidosis. The so-called warm food refers to foods that can warm the body, such as onions, leeks, Chinese cabbage and so on. The so-called hot food means that it is easier to warm the body than warm food, generally referring to some spicy spices and the like. Chinese medicine believes that warm food is good for the skin, and in autumn, we should pay more attention to protecting the yang. Therefore, the autumn diet can be warmed up, and eating more beef and mutton, lotus seed porridge, medlar and other foods can warm up the qi and blood, moisten the viscera and care for the skin. Cold food refers to foods that can make the body cold, including eggplant, tomatoes, cucumbers and other foods. If the nature of food is between mild and cold, it is called flat food. For example, white radish and eggs are both flat foods. There are many cold foods in daily life, such as rabbit meat, chicken, duck meat, eggs, kelp, honey, sesame, tremella, lotus seeds, lily, white radish, Chinese cabbage, celery, spinach, winter bamboo shoots, bananas, apples and so on. Professor Gan said that these foods are best eaten with warm food, which is good for your health. Cucumber vegetables, except pumpkin and cucumber, are warm, and others, such as bitter gourd, loofah, cucumber, vegetable melon, watermelon and melon, are cool vegetables. Tomato, eggplant, celery, chrysanthemum brain, sunflower (purple leaf), lettuce, asparagus, watercress, cold potato, etc. It also belongs to the cold and temperature properties of cool vegetables and fruits. Hot fruits: durian and black dates suitable for cold constitution. Warm fruits: mango, litchi, peach, longan, rambutan, peach, chestnut, Sakyamuni, coconut, kumquat, ebony, cherry, red date and plum (lukewarm) Warm fruits: passion fruit and lemon are suitable for all kinds of physique. Cold fruits of Indian jujube: pitaya, pear, apple, carambola, mangosteen, grapefruit, strawberry and loquat; Cold fruits: tomatoes (slightly cold), watermelons, bananas, kiwis, melons, grapefruit, oranges, persimmons, coconut water,