To supplement the four seasons, we must first understand the characteristics of the four seasons. Based on the understanding of nature at that time, the ancients put forward the theory of Yin-Yang and Five Elements. The so-called "life is based on yin and yang." It is also believed that "Yang is qi, Yin is flavor", "Yin is born in five flavors", and the smell is consistent, with the essence of invigorating qi ",which links the change of Yin and Yang with the four flavors of food. "Neijing" said: "Spring and summer nourish the yang for the people; Nourishing yin in autumn and winter, from its roots, two qi are always there. "How to nourish Yin and Yang? Li Shizhen said: "Spring is cold and food is cold, and Xia Han raises yang; Eat warm food in autumn and hot food in winter to nourish yin. "Adapt to the relationship between eating habits and cold, hot and cold seasons. Summer is hot, and cold food is needed to clear away heat and relieve summer heat; On the contrary, the winter climate is very cold, and the human body needs spicy or spicy food to warm the yang and dispel the cold. The ancient viewpoint of dietotherapy and health preservation has been confirmed by modern medicine and nutrition. For example, in cold winter, the basal metabolism of human body increases by 65,438+00% ~ 65,438+05%, and the demand for total calories is the highest. Therefore, we should eat more foods rich in protein and fat in winter, such as beef and mutton, dog meat and fish, milk and bean products. The dry climate in winter is prone to cheilitis, angular stomatitis, dry skin and other symptoms, so we should eat more foods rich in vitamin B2 such as pork liver, eggs and beans in winter. On the contrary, in the hot summer, people sweat a lot, resulting in a large loss of potassium and sodium, resulting in disorder of inorganic salt metabolism, decreased serum potassium depth and a large loss of water-soluble vitamins. Therefore, it is advisable to eat more potassium-rich soybeans, mung beans, black beans, cucumbers and potatoes in summer, and often eat mung bean porridge, sour plum soup, watermelon and other foods to relieve summer heat and promote fluid production. Generally speaking, according to different seasons, different nourishing methods are adopted. Everything grows upward in spring, which can be used to make up; Summer is hot and hot, and people like to be cool, so it is appropriate to use Qinghua; If the climate is cool in autumn, it should be flat; The winter climate is cold and suitable for nourishing; And the four seasons need to be replenished. In spring, the foods suitable for the four seasons are pork liver, pork, eggs, beans and bean products. Fresh vegetables such as leeks, bamboo shoots, pea seedlings and fresh crucian carp can replenish moderate coke, clear the spleen and stomach and benefit the large intestine, so it is advisable to eat more in moderation; In summer, you can choose to eat mung bean soup, lotus leaf porridge, cold bean sprouts, persimmon mixed with sugar, lily red jujube soup, watermelon litchi; Eat more tremella, jujube, honey, right kernel, walnut, lotus seed, longan and so on. Autumn; In winter, you can choose isothermal foods such as beef and mutton, dog meat, chicken, fish, walnuts and brown sugar. Four-season tonic is a tonic method that can be named regardless of seasons. It should be gentle, gentle. Common foods are red beans, lentils, black beans, peas, yam, loofah, fungus, mushrooms, potatoes, dates, carp, eggs and so on. And it can be eaten in all seasons.