| Sumario: | This article focuses on the mucosal immune system, which serves as the body's first line of defense by protecting mucosal tissues lining the respiratory, digestive, and urogenital tracts. These tissues produce an active mucus layer containing beneficial microbes, antimicrobial proteins, and immune molecules like immunoglobulin A (IgA) that help distinguish between harmless and harmful agents. The gut microbiota plays a crucial role in maintaining this barrier, with diet and stress significantly influencing immune function and gut integrity. Chronic stress can disrupt the gut microbiome and increase intestinal permeability ("leaky gut"), raising the risk of inflammation and autoimmune conditions. Overall, a balanced immune response depends on regulation and tolerance rather than overactivity, supported by healthy lifestyle habits such as adequate sleep, a fiber-rich diet, and stress management.
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