bubble_chart Content

The triple energizer, also known as "San Jiao", is a mysterious "organ" in Traditional Chinese Medicine (TCM). Once its essence is understood, it becomes clear that the seemingly enigmatic triple energizer is actually a great discovery of TCM.

TCM had a model of the body's fluid circulation pathways as early as the era of Neijing. Neijing-Linglan Midian Lun mentions, "The triple energizer is the official in charge of dredging, and the waterway originates from it." The official in charge of dredging is the position responsible for managing waterways and canals, indicating that the triple energizer is the pathway for circulating fluids in the body. Neijing-Jingmai Bie Lun states that after water is absorbed through the digestive system, it enters the body, passes through the lungs, the internal "waterway," and then is excreted from the body via the bladder. The "waterway" referred to here is the triple energizer. The text also describes "the upper energizer as a sprayer, the middle energizer as a fermentor, and the lower energizer as a drainer." Neijing-Jueqi states, "The upper energizer opens and spreads the flavors of the five grains, moistens the skin, fills the body, and nourishes the hair, like the irrigation of mist and dew." These can be summarized as:

• The upper energizer is like "mist," describing it as a finer waterway. The text also mentions that the upper energizer "emerges from the upper mouth of the stomach, runs alongside the throat, passes through the diaphragm, spreads across the chest, moves to the armpit... reaches the tongue, and connects to the foot yangming... always travels with the nutrient-blood... circulates once... and reunites at the hand taiyin." This means the upper energizer is a fine waterway that travels with the "nutrient-blood" throughout the body, irrigating the tissues like "mist and dew."
• Neijing-Yingwei Shenghui states, "The middle energizer is also adjacent to the stomach," so the middle energizer is closely connected to the stomach and intestines. The middle energizer receives the fluids and nutrients digested and absorbed by the spleen and stomach, which "separate the dregs, steam the body fluids, and transform their essence." The middle energizer is like a "fermentation vat," as described in Shuowen Jiezi: "Fermentation is a prolonged soaking," metaphorically describing food soaking in the stomach and intestines, undergoing fermentation and decomposition. The absorbed fluids and nutrients are then transported through the middle energizer pathway "up to the lung vessels, where they are transformed into blood to nourish the body."
• The lower energizer is like a "ditch," which is a water channel or canal. "It seeps downward, filtering and separating the fluids, following the lower energizer to seep into the bladder." Thus, the lower energizer is the pathway that transports urine to the bladder.

At this point, the mystery of the triple energizer can be fully unveiled: water and food enter the gastrointestinal tract, and the fluids and nutrients obtained through digestion and absorption are transported through the middle energizer pathway to the lungs and heart, then pushed throughout the body. The fluids and nutrients seep into all tissues through the fine pathways of the upper energizer. As for the fluids the body does not need, they are transported through the lower energizer pathway to the bladder. The triple energizer is the pathway for circulating clear fluids, distinct from blood vessels, which circulate red blood.

Comparing this with modern anatomy reveals a surprising discovery (Figure 1): the essence of the middle energizer is the micro-lymphatic vessels closely connected to the intestines. They collect some of the nutrients absorbed by the intestines, eventually converging into the thoracic duct, which empties into the left subclavian vein, flows into the heart, and is distributed throughout the body. The essence of the upper energizer is the interstitial spaces and micro-lymphatic vessels between all cells and capillaries. Fluids and nutrients from the capillaries seep through the vessel walls into the interstitial spaces, reaching the cells, while some fluids return to the large veins through the micro-lymphatic vessels, enter the heart, and are pushed throughout the body, creating a continuous cycle. The essence of the lower energizer is the ureter. It is astonishing that ancient people, without the aid of high technology, could have such a profound understanding of the human body thousands of years ago!

Therefore, the author reintroduces the triple energizer from a colloquial perspective once again:

• The upper energizer is a network of fine channels distributed throughout the tissues of the human body. It is like mist and dew, showering sweet rain to nourish and irrigate every cell.
• The middle energizer is the conduit for transporting food. The delicious nutrients absorbed through digestion in the stomach and intestines are delivered to the heart and lungs via the middle energizer, and then sent throughout the body to nourish every cell.
• The lower energizer is like a sewage drainage pipe, expelling metabolic waste water from the body through urination.

In the human body, red blood flows through blood vessels, while clear fluids circulate in the spaces outside the blood vessels (i.e., interstitial spaces and lymphatic vessels). Fluid seeps out from capillaries into the interstitial spaces (Figure 2), bringing oxygen and nutrients. Some of the fluid seeps back into the capillaries, while some enters the lymphatic capillaries, which then converge into larger lymphatic vessels and eventually drain into the large veins, returning to the bloodstream. Thus, blood and fluids are one when combined and two when separated. Their components are largely the same, with the main difference being that red blood cells and platelets in the blood do not seep out of the capillaries, and larger molecules can only enter through the lymphatic capillaries and eventually return to the bloodstream. The channels through which these clear fluids flow are known in Chinese medicine as the triple energizer.

The Neijing-Yingwei Shenghui also mentions, "nutrient qi flows within vessels, defense qi flows outside vessels." Here, nutrient refers to nutrient-blood, vessels refer to blood vessels, and defense qi refers to the body's immune army. This means "nutrient-blood circulates within blood vessels, while defense qi flows outside the vessels." The channels outside the blood vessels are the triple energizer, which aligns with modern medical findings that the lymphatic system is also part of the body's immune system. It is astonishing that the predecessors of TCM, without the aid of advanced technology, could arrive at conclusions that were centuries ahead of their time!

Therefore, how could such an important system as the lymphatic system be absent in TCM? It is actually embedded within the concept of the triple energizer in TCM.

The character "Jiao (焦)" in triple energizer is quite special. What does it signify? Neijing-Wulong Jinye Biepian states, "The triple energizer emits qi to warm the muscles and fill the skin." This means that the triple energizer not only irrigates the body with fluids but also carries "warmth," capable of warming the entire body. The meridian of the triple energizer is the hand shaoyang. In the context of the Six Climatic Factors, shaoyang represents "ministerial fire," the "fire of the prime minister," which assists the "monarch fire" in regulating the body's heat (i.e., the efficiency of oxidative energy production), playing a role in warming the entire body.