The winter solstice is the shortest day and the longest night in the northern hemisphere all year round. After the solstice in winter, the days will get longer day by day. The key to the winter solstice lies in a subtle node of the rise and fall of yin and yang. Since ancient times, there has been a saying that "the sun is born in winter", which means that from the beginning of winter, the growing Yin finally reached its peak, while the Yang finally stopped eroding and will rise again. When Yang is born, just like farmers' seedling raising and women's pregnancy, it needs careful care and careful nursing to make it thrive. Only when the body is full of Yang Can can people achieve the goal of getting rid of diseases and prolonging life. As the saying goes, "tonic this winter, tiger hunting next spring." Traditionally, it is believed that winter tonic is beneficial to store essence in the body and increase the body's disease resistance, so that you can get sick or less in spring. Supplementing medicated diet from winter to Sunday, on the one hand, nourishes the body and resists the cold; On the other hand, it touched the organs of the revival of all things, and helped the newly budding poplar gradually become magnificent and brilliant with a dose of medicated diet. Generally speaking, the nourishing food from winter solstice is mainly meat, plus various nourishing herbs stew. In the north, there is a custom of eating dog meat and mutton from winter to Sunday, because the weather enters the coldest period from winter to the future, and Chinese medicine believes that mutton and dog meat have the functions of aphrodisiac and tonic. Southerners want to eat chicken on the solstice in winter. There is a saying in old Nanjing that "eat 9 1 chicken". Chinese medicine believes that chicken has the effects of warming the middle warmer, benefiting qi, replenishing essence and marrow, benefiting five internal organs and tonifying deficiency. Ginseng Radix, Radix Astragali, Rhizoma Dioscoreae, and Fructus Jujubae are added. Eating soup is of great benefit to the human body. At the same time, tonic must be targeted, whether it is food tonic or medicine tonic, it should be noted that people with deficiency and cold constitution should not eat cold food and cold tonic; People with body heat should not use hot and humid foods and supplements. Tonifying varies from person to person, and blind tonic will bring negative effects.