People who are good at keeping in good health should practice both inside and outside. This concept has a long history. "General Theory of Materia Medica" said: "Those who are good at keeping in good health should be nurtured internally, while those who are not good at keeping in good health should be nurtured externally. People who support the outside world are real. They are eager for quick success, greedy for money and unrestrained, but they don't know that the outside is actually empty inside. Those who are good at nourishing the five internal organs and six internal organs will make the internal organs peaceful, keep the triple energizer in position, and have a proper diet. " The book vividly points out the disadvantages of keeping outside and the importance of keeping inside, and puts forward the view that health care workers should keep inside.

In fact, nourishing inside and outside is relative, and there is no clear boundary between inside and outside. For the cultivation of mind and food, the cultivation of mind is to nourish the inner, while for the cultivation of food and medicine, the cultivation of food becomes to nourish the inner. However, in either case, nurturing the inside is fundamental, which fundamentally improves the quality of life, while nurturing the outside is often quick success and instant benefit, which solves the side problem. Then why can't we give priority to keeping it inside while keeping it outside? Isn't this more comprehensive and thoughtful? In this regard, Gao Lian, a famous health care scientist in the Ming Dynasty, thinks: First of all, this statement is targeted, because people tend to raise outside, so we should first emphasize internal support. Secondly, it is easy to interfere with or cover up internal support, so we must first advocate internal support.