Only When the Gut Is Clean Can the Blood Become Pure

How does modern science interpret the teachings of Donguibogam? Recent studies reveal that gut health extends far beyond simple excretion, exerting a profound influence on whole-body health, particularly brain function and immunity. The Donguibogam teaching that dry, hardened stool reflects damaged qi and blood aligns closely with modern concepts of hypoperistalsis, gut dysbiosis, and an increased systemic inflammatory response. Chronic constipation is not simply a matter of a sluggish bowel. The gut is so intimately connected to the brain that it is called the second brain, communicating continuously along the gut-brain axis. Approximately 90% of the body's serotonin is produced and stored in the gut, transmitting bidirectional signals to and from the brain via the vagus nerve. When stool lingers in the colon due to constipation, it creates an ideal environment for harmful bacteria to proliferate. These harmful bacteria generate toxins that can damage the intestinal mucosa, potentially triggering leaky gut syndrome. When toxins and inflammatory substances pass through the compromised intestinal mucosa into the bloodstream, they travel through systemic circulation and promote chronic inflammation. Skin issues, chronic fatigue, joint pain, and even mood disturbances such as depression and anxiety are deeply connected to gut health. In this sense, the classical concept of damage to qi and blood serves as a remarkably apt description of systemic hypofunction and widespread inflammation. Furthermore, the gut microbiota, or microbiome, plays a decisive role in immune function. Countless microorganisms in the gut assist with digestion, synthesize vitamins, and form an essential defense against pathogenic bacteria. A rich and diverse population of beneficial bacteria strengthens immunity. However, when the gut environment deteriorates from constipation, beneficial bacteria decline while harmful bacteria flourish. This leads directly to decreased immunity, raising the risk of frequent colds, allergies, and autoimmune diseases. Modern science continues to confirm the insight of Donguibogam that gut health is central to systemic health. Keeping the gut clean and cultivating a balanced intestinal environment remains the most fundamental way to clear the blood and nourish qi and blood.