Evidence check: ADH1B in the context of gut health

ADH1B encodes alcohol dehydrogenase 1B, a key enzyme in ethanol metabolism. In the context of gut health, ADH1B is relevant indirectly: variants (e.g., rs1229984) alter ethanol oxidation and thus systemic and local acetaldehyde exposure. Acetaldehyde can damage the gut barrier, disrupt tight-junction proteins, and increase permeability – a factor linked to leaky gut and systemic inflammation. Additionally, ADH1B polymorphisms may modulate gut microbiome composition, as alcohol metabolites selectively affect bacterial growth. However, the evidence is largely mechanistic; large human studies with direct gut health endpoints are lacking. MyBody-X tests (e.g., NutriCare, Longevity) include ADH1B, but interpretation for gut health is speculative. Caveat: ADH1B is not an established biomarker for gut diseases; clinical relevance remains unclear. A healthy diet and moderate alcohol intake are currently more important than a single gene.