Myths vs facts: CRP Entzündung and Darmgesundheit

CRP (C-reactive protein) is a well-established marker of systemic inflammation, produced by the liver in response to inflammatory cytokines. Gut health is often linked to inflammation via the 'leaky gut' hypothesis, where impaired intestinal barrier allows bacterial components (e.g., LPS) to enter circulation and trigger CRP production. However, the evidence for a direct causal relationship between gut microbiome composition and CRP levels in healthy individuals is moderate at best. Observational studies show associations between certain gut bacteria (e.g., Faecalibacterium prausnitzii) and lower CRP, but effect sizes are small and confounded by diet, lifestyle, and medication. CRP is not a specific diagnostic marker for gut health; elevated CRP requires medical evaluation to rule out infections, autoimmune diseases, or other conditions. Consumer tests that claim to link CRP directly to gut health often overstate the evidence. Lifestyle interventions (fiber-rich diet, exercise) may lower CRP, but genotype-guided or microbiome-guided approaches lack robust RCT support. Evidence: human-moderate (associational, not causal).