The core of the health-preserving thought in "Huangdi Neijing" is "correspondence between heaven and man" and "preventive treatment of disease", emphasizing compliance with the laws of nature, harmonizing the balance of yin and yang, and focusing on spiritual adjustment. Its content structure can be divided into three levels:The first principle is "the law is based on yin and yang, and the harmony is based on magic number"(Follow the laws of nature);The core method is to "eat in moderation and live regularly"(Self-discipline in life);The ultimate goal is to “have both form and spirit”(Harmony of mind and body). The main content includes specific practices such as four seasons care, emotional management, meridian guidance, etc.

Following nature is the foundation of health care. The "Huangdi Nei Jing" puts forward the four-season health rule of "spring births, summer growth, autumn harvests and winter storage". For example, "Suwen·Four Qi Regulating Spirit" records that in spring, you should "sleep at night and get up early", and in winter, you should "go to bed early and get up late". This view of time rhythm is highly consistent with modern biological clock theory. The book also uses the Chinese character "grasp the heaven and earth, grasp the yin and yang", pointing out that human beings need to adjust their behavior by observing the sun, moon, stars, climate and phenology. For example, avoid being too cold to avoid summer heat, and avoid being too warm to avoid cold in winter, which embodies the overall view of "the unity of nature and man".

The balance of yin and yang is the key to regulation. "Lingshu Benshen Chapter" emphasizes that "yin and yang are evenly balanced to fill their shapes" and points out that health preservation requires dynamic regulation of yin and yang in the body. The specific manifestations are: the principle of "five grains for nourishment and five fruits for help" in diet; in terms of exercise, it advocates "gentle guidance" rather than strenuous consumption; in emotional management, it advocates "tranquility and emptiness" to avoid excessive emotions. The book specifically warns that "sickness originates from overuse." Common modern problems such as chronic fatigue and metabolic disorders confirm the predictability of this warning 2,500 years ago.

Co-supporting body and soul is the ultimate state. "Suwen·Ancient Innocent Theory" describes the state of "freedom of mind and few desires, peace of mind but no fear", which reveals the leading role of psychology on physiology. Practical methods include: regulating autonomic nervous function through "breathing essence", cultivating concentration through "independent mindfulness", and using "muscles as one" to describe the exercise effect of physical and mental coordination. Modern research has confirmed that this method of combining meditation, breathing, and exercise can effectively reduce cortisol levels and enhance immunity.

The health system of "Huang Di Nei Jing" is the wisdom that runs through the entire life cycle. From "nurturing yang and protecting health" in youth, to "harmonizing viscera" in middle age, to "preserving energy and whole mind" in old age, a complete health management chain is formed. Its concept of "not treating the existing disease but treating the disease before it" was proposed more than 2,000 years earlier than modern preventive medicine. The dietary formulas (such as Poria porridge) and Daoyin techniques (such as Baduanjin) commonly used in contemporary sub-health conditioning are all derived from this classic. This reminds us that true health care is not about chasing trends, but about returning to the true relationship between the human body and nature.

Quote sources:
1. The classic "Huangdi Neijing" (a medical compilation from the Warring States Period to the Western Han Dynasty)
2. Research monograph "The Wisdom of Health Preservation in the Yellow Emperor's Internal Classic" (authored by Professor Wang Qi of Beijing University of Chinese Medicine)
3. Product data comes from the annual reports of listed companies (Tongrentang 600085, Guangyuyuan 600771)