During the Wei and Jin Dynasties, health preservation flourished, but there were two opposing ideas at that time:

First, it is believed that cultivation can become immortal and live forever; The second is that "life and death are all decided by heaven, and half of them are not decided by people."

In view of this phenomenon, Ji Kang pointed out that immortals are impossible. If they are properly cultivated, they can settle down, and Peng Zu's theory can be achieved.

In his important book "The Theory of Health Preservation", taking guiding and raising people to live longer as the general argument, he put forward the following views:

First, both form and spirit are important. He illustrated the powerful effect of spirit on human body with examples, pointing out that "from this, spirit is to bones, and Judah has a monarch." Chinese medicine also believes that people are God-oriented, and the death of God means the death of form. Ji Kang grasped the root of health preservation here.

Second, health care should pay attention to one benefit, be careful of harm and be carried out in an all-round way. Ji Kang believes that everything in heaven and earth is given different maintenance and life expectancy the day after tomorrow. Don't do it because you are young, don't do it because you are too young, take precautions for a long time, take precautions early, and actively strive for longevity.

Third, it is pointed out that if you don't pay attention to your health, indulge in debauchery, drown your interest and have too many emotions, you will easily die. "The husband is a physical person, and the attacker is not a smearer; It's easy to get tired, but it's not a stone. How long can it last? "

Fourthly, Ji Kang also warned medical staff to have confidence and perseverance, otherwise it will not be easy to have an effect. We should also follow the example of good health-preserving people, actively absorb good health-preserving methods, be abstinent, maintain a true mentality, "steam Ganoderma lucidum, moisten the ritual spring, take the sunrise and slow down the five chords", so as to "live longer than envy immortals and compete with Wang Qiao for the coming year".

Ji Kang practiced it himself. As the "Seven Sages of Bamboo Forest", Zeng said: "I have lived in Kang for twenty years, but I have not seen him happy." His own theory has been done in almost all aspects, but he has committed the taboo of "forgetting outside the house" and was eventually framed and killed.