Four seasons health is right: spring, long summer, autumn harvest and winter storage. Huangdi Neijing gives the principles of keeping in good health in four seasons: spring, summer, autumn and winter storage. Especially after the winter solstice, all the year round is the best season for tonic, and cream is the best choice for tonic in winter.

The Emperor's Internal Classic wrote:

Huangdi Neijing, also known as Neijing, is one of the earliest ancient books in China and the first of the four classics of traditional medicine in China. According to legend, it was made by the Yellow Emperor, hence its name. However, it is generally believed that this book was finally formed in the Western Han Dynasty, and the author was not a single person, but was created by Huang Lao, a doctor in China.

As pointed out in "Huai Nan Zi Xiu Wu Xun", the title of "Yellow Emperor" is intended to trace back to the source and worship the original to illustrate the early birth of China medical culture. It's not a moment's talk, nor is it a single hand.