“Spring is called hair Chen, summer is called flourishing, autumn is called rong Ping, winter is closed and hidden”, this is the Yellow Emperor’s Classic of Internal Medicine’s summary of the body’s physiological activities throughout the year. Winter means hiding substances. In winter, when the temperature drops, the whole nature starts to enter a stage of convergence and storage of substances. Animals and plants begin to enter hibernation, and people behave in the same way. With less outdoor exercise and less sweating, yang energy becomes introverted. When yang energy is restrained, it is easy to have internal heat. So at this time you can eat some clear and moist foods, such as various fruits, or yam, lily of the valley, lotus root these are all clear and moist nourishing foods. Chinese medicine’s tonic should be in line with the laws of nature. Winter is a season to collect yang and hide essence, so winter tonic is mainly to nourish yin. Why do we need to nourish Yin? Because Yin is the material base, it is the source of the vitality and power of Yang. Without this material basis, the material basis will be lacking in the following year when you want to spread the yang energy and increase your activities. Therefore, the hiding in winter is for the birth and development of the next year. That’s why in Jiangsu and Zhejiang, it’s called “tonic in winter, to fight the tiger in the coming year”, which means that the winter is closed to replenish the yin, so as to prepare for the rise and development of yang in the coming year. In spring and summer, the pores are open and Yang tends to be on the surface of the skin. In autumn and winter, the pores are closed and the yang energy converges and hides inside the body, so in autumn and winter, our body is cold outside and hot inside. Now many people like to eat hot pot in winter, but also like to put more chili peppers, drink to dispel the cold, a long time, the two yang added, the room is heated, the air is dry, and more closed windows to avoid the wind, it is easy to get on fire, so Chinese medicine attaches importance to autumn and winter yin, it makes sense. In winter, you can eat more yin food, such as walnuts, black sesame, mulberry, etc., to replenish kidney yin. In addition, it is recommended to eat creams in winter. Usually eat from the winter solstice, until the fifth nine. Men with kidneys as the first, you can use some nourishing medicine to nourish the yin, such as the black sesame just mentioned. The woman’s blood is the innate, and her life is closely linked to the menstruation and birth, so she is prone to blood deficiency, you can make a paste with walnuts, black sesame, Agaricus, etc.