Zhu Zhenheng, courtesy name Yanshou, was a native of Yiwu in Wuzhou (present-day Yiwu County, Zhejiang Province) during the Yuan Dynasty. He stands as one of the renowned Four Great Medical Masters of the Jin-Yuan period in the history of Chinese medicine, having authored works such as "Supplementary Discourses on the Principles of Medicine" and "Commentaries on the Bureau Formulary." As his ancestral home in Ch'an-an Township, Yiwu, was situated beside the Danxi River, Zhu's descendants have resided there for generations. Hence, he is reverently referred to as Old Master Danxi or Zhu Danxi.
Zhu Danxi stands as a celebrated medical scholar in Chinese medicine history and a true master of health preservation. He made significant contributions not only to medical theory but also to the field of health preservation.
The Path to Health Lies in Daily Nurturing
Zhu Danxi placed great emphasis on health preservation, believing that preventing illness is far more effective than treating it after it occurs. If one neglects daily self-care and relies solely on medication after falling ill, such efforts often prove futile.Preventing illness through health preservation is akin to using earth to block water or water to extinguish fire—the principle is identical: a trickle of water, if not dammed, will inevitably swell into a torrent; a flickering flame, if not extinguished, will inevitably engulf the land. Failing to prevent matters in their nascent stages, only to face catastrophic consequences later, leaves one with profound regret.This holds true for water and fire, and even more so for the human body. Therefore, people must prioritize daily health maintenance and never wait until illness strikes before seeking medical treatment. Guided by this understanding, he proposed a series of specific health preservation principles and applied them to his own life with remarkable results.Even in his seventies, he remained physically robust, energetically vigorous, and possessed a rosy, radiant complexion—a source of astonishment and envy among those around him. When asked about his health secrets, he replied: "Nothing extraordinary—merely nourishing yin, maintaining moderation, and consistent movement."
The Concept of Nourishing Yin and Preserving Vitality
Zhu Danxi's medical views are primarily articulated in two essays from his work "Essays on the Essentials of Medical Science": "On the Ministerial Fire" and "On Excess Yang and Deficiency Yin." He established the principle that "yang is always in excess, while yin is always deficient." Building upon this foundation, he formulated the therapeutic principle of "nourishing yin and reducing fire."His health preservation philosophy also developed under this guiding principle. He believed that even in a healthy state, the human body remains in a condition where yin energy is difficult to cultivate and easily depleted. Compounded by excessive human desires, this can easily trigger uncontrolled phase fire activity, further damaging yin essence and readily leading to yin deficiency. Therefore, he regarded nourishing yin and preserving essence as a vital health preservation principle throughout life.Numerous chapters in his work, such as "On Health Preservation," "On Mild Diet," "Admonitions on Diet and Sexual Desire," "On Sexual Rejuvenation," "On Elder Care," and "On Child Nurturing," are largely grounded in yin nourishment theory, exerting profound influence on subsequent generations.
Zhu Danxi's philosophy of nourishing yin and preserving vitality proved effective in practice, demonstrating genuine efficacy in preventing illness and extending longevity. His mother, who had long suffered from phlegm and fluid retention, experienced no recurrence after turning seventy. Zhu attributed this to her skillful cultivation of yin.His mother also suffered from spleen and stomach ailments. By consistently administering nourishing yin formulas and maintaining daily health practices, she attained a long life, passing away peacefully at 87 without illness.
Zhu Danxi posited that aging and disease primarily stem from insufficient yin energy coupled with relative excess of yang energy. Thus, he advocated nourishing yin and reducing fire to prevent and treat geriatric diseases. His renowned formulas, such as the Great Yin-Nourishing Pill, remain in clinical use today.
Zhu Danxi particularly emphasized yin nourishment for the elderly. At the time, it was common practice to use yang-tonifying drugs to strengthen the elderly and treat age-related illnesses. Zhu Danxi, however, proposed his own unique perspective. Through observing the physiological and pathological characteristics of the elderly, he clearly identified that many elderly individuals develop internal deficiency heat syndromes due to yin deficiency. He strongly advocated nourishing yin to prevent age-related diseases.In treatment, he cautioned against indiscriminate use of drying and heat-inducing agents like Aconite and Aconite Root. He even prohibited alcohol, meat, oily foods, roasted or braised dishes, and pungent, sweet, or slippery substances.
The principle of yin nourishment for the elderly exerted profound influence on subsequent generations. Medical practitioners in the Jiangnan region during the Qing dynasty, notably Xu Lingtai and Lu Jiuzhi, were particularly influenced by his views. They opposed the practice of focusing solely on yang tonification for the elderly and instead strongly advocated for yin nourishment. Modern clinical observations confirm that yin deficiency with internal heat is indeed common among the elderly, particularly among women.
The Benefits of a Simple Diet for Health Preservation
Zhu Danxi recognized that diet profoundly impacts human health. Proper eating promotes well-being, while improper choices can cause illness and shorten life. In his later years, his diet was largely unseasoned, eschewing gourmet delicacies in favor of simple flavors. His philosophy of health preservation through simplicity is encapsulated in the "Treatise on Simplicity" within his work "Supplementary Discourses on the Principles of Knowledge."
He noted that food falls into two categories: "those endowed by nature" and "those shaped by human hands." "Those endowed by nature" refer to grains, legumes, vegetables, and fruits possessing their inherent natural flavors. Consuming these replenishes yin energy, corresponding to the five flavors described in the Inner Canon."Artificially enhanced flavors" refer to those created through human cooking and seasoning, which impart an overly rich taste. Consuming such foods can have toxic side effects, harming health rather than benefiting it. Advocating for a simple diet—avoiding rich, heavily seasoned foods—means eliminating artificially enhanced flavors and embracing the natural, harmonious taste of food, which is beneficial to humans.He also replaced the character "畜" (livestock) in the Huangdi Neijing's classification of grains, livestock, vegetables, and fruits with "菽" (legumes). "菽" is the general term for beans. He pointed out that grains, legumes, fruits, and vegetables belong to the Yin nature, making them excellent for replenishing Yin in the human body. They are easily digestible and also possess a smoothing effect.
The method of consuming various foods also requires careful consideration. For instance, japonica rice is sweet and bland, embodying the virtue of earth. Being yin in nature, it offers the most nourishing benefits. However, it must be eaten alongside vegetables to prevent excessive intake due to hunger, which could damage the spleen and stomach. Vegetables help achieve satiety while facilitating digestion through their dispersing properties.Conversely, consuming grains with rich, fatty foods allows the heavy flavors to accumulate with the aid of grains, eventually causing various illnesses. In essence, Zhu Danxi's "eating lightly" principle advocates nourishing yin and protecting the stomach through simple, natural foods, opposing the use of pungent, hot, and rich foods that harm yin and damage the stomach.
Zhu Danxi was the first to discover hawthorn's appetite-stimulating properties. He noted that while hawthorn can "transform food," excessive consumption is inadvisable. When the stomach lacks food stagnation, the spleen is deficient in transporting and transforming, or appetite is absent, overindulging in hawthorn may instead suppress the spleen and stomach's vital energy. It was through Zhu Danxi's work that hawthorn's efficacy gained recognition and widespread application.As Li Shizhen noted: "It was Zhu Danxi who first documented hawthorn's efficacy, after which it became a vital medicinal herb."
Also known as mountain hawthorn, red fruit, or rouge fruit, hawthorn possesses significant nutritional and medicinal value.For the elderly, moderate consumption of hawthorn products can enhance appetite, improve sleep, maintain calcium levels in bones and blood, prevent atherosclerosis, and promote longevity, earning it the reputation as a "longevity food."
In daily life, the health principle of "eating lightly" holds practical value not only for adults but also for young children.During childhood, the body is still developing and the spleen and stomach are relatively weak, so a "light and bland" diet with smaller portions is essential. Parents should avoid indulging children excessively by catering to their every whim without dietary restraint, as this can damage their digestive systems. This explains why many children from wealthy families, raised in pampered environments, remain prone to illness and grow up with weak bones, poor physical strength, and overall poor health.
Advocating the "Constant Movement Theory" for Health Preservation
Zhu Danxi also championed the Constant Movement Theory in health preservation. In his Treatise on the Ministerial Fire, he first posited that life's continuity depends entirely on movement, stating: "Heaven governs creation through perpetual motion; thus, human existence likewise relies on constant activity." He skillfully applied this principle in clinical practice.
Legend has it that near Zhu Danxi's hometown lived a wealthy man surnamed Feng, past fifty years of age. Two of his three sons had died young, leaving only the youngest. Feng doted on his third son like a precious jewel, feeding him rich, fatty foods daily. As a result, the boy grew so obese he could barely stand upright.Upon hearing that Zhu Danxi could cure all manner of difficult ailments, the wealthy Feng sought his treatment. After examining the boy, Zhu shook his head and said, "This is obesity—difficult to treat!" Eager to cure his son, the wealthy Feng pleaded repeatedly with Zhu Danxi. After pondering for a moment, Zhu Danxi said, "To cure this illness, one must find a medicine called 'Miracle Spirit Pill.'This herb grows among the boulders behind the pagoda at Da'an Temple, and it must be gathered by the patient himself to be effective." To save his son, Feng had no choice but to send him as instructed. Every morning at dawn, Feng's son climbed the mountain in search of the "Miraculous Elixir." Day after day, season after season passed, yet the herb remained elusive. Meanwhile, Feng's son grew stronger and his weight dropped significantly.One day, amid the mountain's rocky outcrops, he suddenly discovered a note reading: "Feng Laosan, Feng Laosan, movement is the miraculous elixir. With diligence and a kind heart, why seek elixirs far and wide?" Only then did Feng Laosan grasp Zhu Danxi's "miraculous remedy" for his ailment.