The environment mainly includes climate and geography. If people want to live a long and healthy life, they must try to adapt to the natural environment in which they live. In Su Wengu's naive theory, "dharma yin and yang" refers to actively adapting to the four seasons to maintain the body. Following the above ideas in Huangdi Neijing, later generations of health experts gradually established a series of very practical health-keeping methods to adapt to the environment, including: adapting to the four seasons. Su Wen's Theory of Four Seasons Regulating the Spirit pointed out: "The yin and yang of the four seasons are the foundation of all things. Therefore, saints nourish yang in spring and summer and yin in autumn and winter to follow their roots, so they float and sink with everything at the door of longevity. If you violate its roots, you cut off its roots, which is really bad. Therefore, the four seasons of Yin and Yang are the end of all things and the foundation of life and death. On the contrary, it is a curse. From it, you can't afford to get sick, but it is also a way. " Health preservation in spring. "Four Qi Qu Zi Spirit" points out: "In March, this is the life of Chen Zhisheng, the life of the world, the pride of everything, lying in the night and getting up early, striding around the court, going slow, so as to make life ... This spring should be the way of fitness." From the perspective of dirty image theory, the liver, gallbladder, meridians and qi are comfortable in spring. At this time, people who are good at keeping in good health must avoid stagnation of liver qi and depression of thinking, but make their thoughts cheerful and liver qi comfortable, which is the requirement of adapting to spring keeping in good health in ideological cultivation. Related to this, excessive liver qi often occurs in spring, leading to excessive liver qi and spleen. According to the theory of five elements regulation, at this time, we should also "save acid and sweeten it to nourish the temper" (a thousand dollars to be brilliant) to meet the requirements of spring health preservation from the diet. Health in summer. Su Wen's Theory of Five Movements said: "Heat is generated in the south, and heat makes a fire. According to this feature, the ancients advocated that summer health should be cheerful, peaceful, not impatient, not angry, so as not to cause internal fire. In daily life, we should go to bed late and get up early, and bask in the sun properly to adapt to the exuberance of yang in nature and help the excessive yang in the body to vent outward. In terms of diet, the theory of health preservation holds: "It is hot in summer, so it is advisable to eat cold food, not hot food. "I advocate eating more miscellaneous grains in summer to cool your body, and don't eat too much hot food, so as not to aggravate the heat in your body. Autumn health. " Su Wen's "Four Qi Tiaoling" said: "Autumn and March are originally tolerance, the weather is urgent, the atmosphere is clear, people lie down and get up early, have fun with chickens, make the heart calm, delay the autumn punishment, converge the essence, make the autumn air calm, and have other ambitions, so that the lungs are clear and the way to raise income is also. "Autumn diet should reduce the spicy taste and increase the sour taste, so as to avoid excessive lung qi and excessive liver qi. In addition, due to the dry weather in autumn, people should eat more sesame and other foods to moisten and nourish the lungs, eat less cold food and eat more warm food. In daily life, you should go to bed early and get up early. When the air is crisp in autumn and the scenery of mountains and rivers is clear and clean, you should climb high and overlook and relax your lungs more.