In my clinic, I often meet patients who quietly share that they miss the effortless energy, lustrous hair, and firm skin of their younger years. They feel that some deep inner reserve of vitality is slowly running low.
They are right to feel that way, because the same biological reserve of vitality that once made growth, recovery, and resilience feel automatic is now being depleted faster than it can be restored.
The most fundamental substance that governs vitality—or the “essence of life”—is called “jing” in traditional Chinese medicine (TCM). It is the heart of TCM’s 5,000-year-old system of preventive care, which holds that this vital essence shapes how we age and how vulnerable we are to disease.
When your life’s essence is abundant and well-guarded, you age gracefully and enjoy longevity. Your mind stays sharp into old age, your bones and muscles remain stronger, and you are less likely to experience fertility issues.
To understand why, let me explain how this essence quietly directs your life, from the moment you are conceived and onward.
The ‘Biological’ Savings Account
Think of the essence of life as your “biological” savings account of vitality that your overall health draws upon. The essence of life is stored in the kidneys and is therefore also known as the kidney essence, or kidney jing.
The account’s opening balance, known as the prenatal essence, is the portion you inherit from your parents at the time of conception. It fuels your early growth and development in the womb. In modern terms, the prenatal essence can be partly compared to genetic inheritance—it determines your basic biological profile and provides the template for how you grow and mature.
Prenatal essence is fixed and can only be preserved and spent.
Postnatal essence is the portion you generate after birth, and unlike prenatal essence, postnatal essence can be replenished. It is accumulated from the “deposits” made into the biological account through the food you eat, the air you breathe, and the quality of rest and lifestyle you maintain.
In modern terms, postnatal essence can be thought of as the life reserves your body builds up—it reflects how efficiently you convert nutrition, oxygen, and experiences into energy, which fuels growth, stamina, and resilience against disease.
Every developmental and physiological activity draws upon your life’s essence.
Manifestations of Essence
The essence of life waxes and wanes across the different stages of your life.
During childhood and adolescence, this essence powers both physical development and overall robustness, helping build and strengthen the body’s structure and functions.
As a child grows, the essence of life supports bone and marrow formation, tooth and hair development, and the maturation of the brain and nervous system. Children with abundant essence are active, develop well, and are less prone to illness. On the contrary, weak essence leads to developmental delays.
Puberty is reached when the essence of life directs the body toward sexual maturation. In TCM, delayed puberty is described as weak or constrained jing. Between the late teens and 30s, life’s essence is at its fullest and manifests as strong fertility, physical strength, and faster recovery from exhaustion or illness.
From midlife onward, you begin to feel a gentle decline in your life’s essence. Early signs include increased hair fall, reduced skin elasticity, premature graying, and the appearance of fine lines and wrinkles. Recovery after stress or illness feels slower than before. As aging progresses, fertility declines, bones weaken, cognition declines, and resistance to illness declines.
Both prenatal and postnatal essence direct how life unfolds. The quality of postnatal essence accumulated through nourishment, rest, and emotional upbringing can either support or deplete the inherited essence during these years.
To bring this idea from medical theory into lived experience, let me share a story of one of my patients.
A 45-year-old lecturer at England’s Cambridge University came to see me after unsuccessful in vitro fertilization treatments and struggles with irregular menstrual cycles. At her age, her kidney essence was naturally depleted, and her family and professional demands had created additional stress.
To help her conceive naturally, I focused on creating “fertile” bodily conditions conducive to pregnancy. In TCM terms, this is akin to cultivating the soil and strengthening the seed—in other words, restoring the womb’s internal environment and enhancing the quality of the egg.
Over several months, she received regular acupuncture and customized herbal therapy to nourish her depleted essence and blood. Her menstrual cycles gradually became regular, her sleep improved, her energy stabilized—and she conceived naturally. Her pregnancy progressed to full term, and she gave birth to a healthy baby through natural childbirth.
This patient’s case illustrates TCM’s core principle of prevention: When the body’s foundational vitality—the essence—is preserved and supported, natural conception becomes possible, even in cases that once appeared unlikely.
Preserving Your Life’s Essence
How do you protect your essence’s deep reserves?
I often tell my patients that the healthier they eat, the better they rest, and the more virtuously they live, the more they will be “investing” in their biological account. Here’s what I recommend:
1. Eat a Nutritious Diet
In TCM, seeds and legumes are valued for their ability to nourish the essence of life.
A seed contains the full potential for new plant life, and symbolically and energetically, it is considered supportive of the body’s own deep reserves. It sounds philosophical, but modern research suggests that whole seeds, such as black cumin (Nigella sativa), can support the kidneys—the storehouses of life’s essence. Some clinical trials indicate the benefits of Nigella in stage 3 to 4 chronic kidney disease and an increased likelihood of passing kidney stones.
In TCM, black-colored foods are considered good for kidney health. Black sesame seeds, black beans and dates, Nigella seeds, walnuts, and goji berries are good sources for nourishing and supporting the kidneys.
You can also turn to animal-based foods such as slow-cooked bone broth—especially when prepared with marrow-rich bones—to fortify the kidneys and their stored essence.
2. Moderation in Sexual Desires
In TCM, reproductive secretions (fluids) are considered manifestations of life’s vital essence. They are not merely bodily fluids—they contain the human body’s refined substance necessary to create new life.
Excessive sexual activity is believed to directly consume this vital essence, wearing down the body’s stored reserves of essence over time. When you draw more frequently than you invest in your life’s savings account, the body gradually weakens, accelerating aging and reducing vitality. In TCM, moderation and self-restraint are essential to longevity.
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3. Meditation and Qigong Exercises
As I shared in the previous parts of this series, ancient Chinese culture lays great emphasis on stilling the mind and calming the heart. In deep stillness, excessive thinking diminishes, and the body’s internal “spending” of the essence of life and the vital energy called qi decreases. Inward reflection protects both prenatal and postnatal reserves, supporting long-term vitality and healthy aging.
4. Moral Integrity
TCM upholds that cultivating moral character serves as a form of physiological protection—by stabilizing your nervous system, hormones, and organ systems—thereby safeguarding your life essence.
Nurturing virtues such as kindness, gratitude, and humility stabilize the Shen—your inner mirror of life—and protect the body’s internal balance and harmony. A calm, upright bearing reduces unnecessary emotional turbulence, thereby preserving life’s essence and the smooth flow of qi energy.
Remember, your essence of life is central to your long-term health. If you rely only on what’s stored in your “savings account,” you will eventually go broke. By cultivating healthy rhythms, you can keep making enduring investments—supporting and replenishing your body’s deeper reserves of life essence.