Modern people, represented by the analysis of Confucian classics in Huangdi Neijing, think that nourishing yang in spring and summer and nourishing yin in autumn and winter can be summarized into three meanings: first, adapting to the four-season regimen, growth belongs to yang, and collection belongs to yin, so the gas for long-term health preservation in spring and summer is nourishing yang, and the gas for collection in autumn and winter is nourishing yin; Second, nourishing yang refers to nourishing the heart, liver and yang; Nourishing yin refers to nourishing lung, kidney and two yin; Third, to raise yang should obey the growth characteristics of yang, so that it can be vented; And nourishing yin should obey the characteristics of Yin Qi's collection, and don't let Yin Qi vent. The above explanation explains the theoretical significance of "nourishing yang in spring and summer and nourishing yin in autumn and winter" from different angles. No matter which point of view is to illustrate that the principles and methods of health preservation in different seasons are different. Only when people understand the meaning of "nourishing yang in spring and summer, nourishing yin in autumn and winter" from a theoretical height can they better "be suitable for cold and summer in all seasons". Specific to the four seasons of spring, summer, autumn and winter, how do people raise yang and yin? There is a more detailed discussion in "A Brief Discussion on Four Qi Regulating Spirit in Neijing", which is now extracted as follows: "Spring and March are called the birth of Chen, the birth of heaven and earth, and all things are glorious. Lying at night and getting up early, striding in court, being slowed down, so that life, living without killing, giving without taking, rewarding without punishment, this spring should be the way to keep fit. On the contrary, it hurts the liver, and it is cold in summer and has few elders. " This is the way to keep in good health in spring, that is, the way to raise yang in spring. It means that in spring, in the first, second and third months, the yang rises, everything sprouts, and nature presents a vibrant face. Heaven and earth breed the spirit of hair growth, and everything is thriving; People should go to bed late and get up early, stride in the courtyard, let their hair loose, relax their bodies and make their minds full of energy. Treat things, don't kill them when you are alive, don't deprive them if you give them, and don't punish them if you reward them. This is the reason to adapt to spring and regulate the "internal heat" of the human body. If the human body violates this truth, it will hurt the liver qi. Liver qi is injured in spring, and cold diseases will occur in summer. This is because people's physique is not strong enough to nourish "Qi" in spring and "Long-term Qi" in summer. According to the original text, raising yang in spring is mainly reflected in: "going to bed late and getting up early": because there are more yang and less yin in spring; "striding in court": because "exercise leads to yang"; "Make ambition alive": make ambition and meaning full of germinal qi, so as to adapt to the germinal qi between heaven and earth; "It turns cold in summer": the cold syndrome in summer is the result of the failure of yang in spring. The above text discusses the specific methods of maintaining Yang Qi from four aspects: daily life, sports, spirit and illness. Although it is not comprehensive, its spiritual essence has been fully reflected. "Xia San month, this is called sweet show, the qi of heaven and earth, everything is flashy. Lying at night and getting up early are insatiable; Make ambition not angry, make Huaying show; Let the gas out. If you love outside, you should be angry this summer, and the road to growth is also sad. Autumn is malaria, and there are few recipients. " This is the way to maintain health in summer, that is, the way to raise yang. It means that in April, May and June in summer, the sun is shining, everything is thriving, and nature presents a lush and beautiful atmosphere. The yin and yang of heaven and earth intersect, and everything blooms and bears fruit; People should go to bed late and get up early, and don't be too long to make the sun be the spirit lazy; Don't get angry easily, it looks as full as grass and flowers; Let Yang vent, as if you love things outside without being suppressed. That's why you need to nourish your qi for a long time in summer and recuperate the Qi Long of the human body. If the human body violates the long-term cultivation of Qi in summer, it will hurt the mood. Summer will hurt your mood, and malaria will occur in autumn. This is because people are not enough to cultivate "long-lasting qi" in summer and meet "qi" in autumn. From the original text, nourishing yang in summer is mainly reflected in: "lying late and getting up early": sleeping late to adapt to yin deficiency in nature and getting up early to adapt to yang fullness; "Never tire of a hundred days": don't hate the long days and make the sun be the spirit lazy; "Make Huaying a Show": In summer, you should adjust your will and enrich your spirit; "Autumn is malaria": Autumn malaria is the sad result of summer invading Xia Chang's qi. The original text also discusses the specific methods of maintaining xia yang from the aspects of daily life, spirit and illness. Although it is not comprehensive, it points out the essence of the problem. "March autumn, this is called tolerance, the weather is urgent, and the atmosphere is cool. Go to bed early and get up early, and have fun with chickens; Tranquilizing the nerves and delaying autumn punishment; Convergence calms autumn; Without ambition, the lungs are clear, and this autumn gas should be raised. Conversely, it will hurt the lungs, it will be diarrhea in winter, and there are fewer people serving Tibet. " This is the way of keeping in good health in autumn, that is, the way of nourishing yin in autumn. This means that in July, August and September of autumn, the Yin Qi has risen, everything has come to fruition, and it is naturally calm. The autumn wind is in a hurry, looking for clarity, and the cold is coming. People should go to bed early and get up early. Make the mind comfortable and quiet to alleviate the punishment of autumn chill; Should converge to cope with the convergence of autumn wind; Not to be disturbed by the outside world, so as to make the lungs quiet, which is the reason to restrain the qi and recuperate the human body in autumn. If the human body violates the qi gathered in autumn, it will hurt the lung qi. Autumn hurts the lungs; Diarrhea will occur in winter, because people's ability to nourish and absorb qi in autumn and to nourish and store qi in winter is not strong enough. From the original text, nourishing yin in autumn is mainly reflected in: "going to bed early and getting up early": going to bed early is to avoid the cold of autumn night and adapt to the length of yin; It's also because of Long Yin that getting up early is later than getting up in spring and summer. "make the heart calm": even if the spirit is included, "the spirit is bloody" can also nourish yin; "no ambition outside": it means not to let your will relax, so as to keep up with the autumn harvest; "In winter and March, this is called hiding, water and ice are twisted (cars), and the sun is not disturbed. Get up early and go to bed late, waiting for the sun; If you hide your ambitions, if you have private interests, if you have your own business; When the cold dissipates, it will heat up without leaking skin, so that the gas will be caught. This winter air should be the way to nourish Tibet, otherwise it will hurt the kidneys. Spring is slack and there are few strangers. " This is the way of keeping in good health in winter, that is, the way of nourishing yin. It means that in winter 10,1month,1February, the Yin Qi is extremely high, everything lurks, and nature presents a closed atmosphere. Water and ice are cracked, and all things are alive, hidden and not exposed; People should go to bed early and get up late, and get up after the sun rises in the morning; Hide your will, keep quiet, as if you have selfish intentions in your chest, and as if you get what you want without revealing it, hide the air; We should avoid cold and warmth, and don't let the skin sweat, which will lead to the loss of yang. This is why the gas should be turned off in winter to regulate the human body's "gas storage". If the human body violates the closed qi in winter, it will hurt the kidney qi. When kidney qi is damaged in winter, paralysis will appear in spring. This is because people don't have enough strength to "store gas" in winter and "get angry" in spring. From the original text, nourishing yin in winter is mainly reflected in: "going to bed early and getting up late": going to bed early and getting up late is to hide one's vitality in order to adapt to the seclusion of nature, that is, nourishing yin; "Make ambition hide": it refers to storing qi and nourishing yin; "Don't leak skin": don't let the skin sweat, this is to protect yang and body fluid from harm. In short, yang must be raised in spring and summer; Autumn and winter must be cloudy, which is the key to keeping in good health in the four seasons, which is called "keeping in good health in time" by Chinese medicine. Yang-raising in spring and summer: Yang-raising in spring and summer requires good Yang-raising in spring and summer. Injury to yang is contrary to the rising trend of yang in nature, which will damage health. We can also understand it from another angle: nourishing yang in spring and summer, such as storing fuel. When the temperature drops in autumn and winter and the weather is cold, the fuel stored in spring and summer will come in handy: it can provide us with protection from the cold. If the fuel is not stored well in spring and summer, and it is cold in autumn and winter, how can we keep out the cold? In Huangdi Neijing, there is a saying that "winter is cold injury and spring is bound to be warm", which means that winter is cold injury and healthy qi is bound to be weak, and spring is invaded by evil spirits and prone to warm diseases. Epidemic febrile diseases are diseases represented by infectious diseases. Raise yang in spring and summer, and avoid being too cold in diet and daily life. (4) Nourishing yin in autumn and winter: Nourishing yin in autumn and winter is also to conform to the rising trend of yin in nature. Raising yin is like watering the flowers. Water was poured in the evening, and when the sun came out the next day, flowers and plants drove the water from the roots up into the veins through photosynthesis, and the water from the roots could take away the nutrients in the soil. If the water is insufficient, the nutrients naturally carried will be insufficient, so how can flowers and plants be full of vitality? In the human body, it does not nourish yin in autumn and winter, but it is hot in spring and summer, and it is easy to get angry. Nourishing yin, the diet should not be spicy, you can drink more water and eat more fish, lotus roots, radishes, carrots, black fungus, sweet potatoes, lettuce and so on. And it can also be conditioned with Chinese medicines such as Lycium barbarum, Ophiopogon japonicus and Polygonatum odoratum. In addition, sweating and staying up late should be avoided: sweating consumes gas and yin, and staying up late is easy to cause yin deficiency.