Editor’s Note: Many chronic brain symptoms do not originate in the brain itself. In 2026, research increasingly shows that inflammatory signals often begin in the gut and travel upward, quietly activating immune cells in the brain. This article explains how that pathway works and why it matters for long-term brain health. The Gut–Brain Immune Highway The gut and the brain are connected not only by nerves, but also by immune signaling. What happens in the gut rarely stays in the gut. The intestinal lining is designed to act as a selective barrier. It allows nutrients to pass through while keeping harmful substances out. When this barrier is compromised, bacterial toxins enter circulation. Once in the bloodstream, these toxins can influence distant organs, including the brain. What Are Gut Toxins? Gut toxins include bacterial fragments such as lipopolysaccharides (LPS), metabolic byproducts, and inflammatory molecules produced when gut bacteria are imbalanced. The...
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