How are HbA1c and gut health related?

HbA1c (glycated hemoglobin) is a long-term blood glucose marker reflecting average levels over the past 2–3 months. Gut health—including microbiome composition, intestinal barrier integrity, and inflammation—can influence glucose metabolism. For instance, certain gut bacteria produce short-chain fatty acids that improve insulin sensitivity. Dysbiosis is linked to increased systemic inflammation and insulin resistance, which may raise HbA1c. However, direct evidence for a causal relationship between gut health and HbA1c in humans is still limited; most studies are observational or mechanistic. MyBody-X offers a microbiome test that assesses bacterial diversity but does not measure HbA1c. Caveat: HbA1c is a clinical lab value that cannot be replaced by a gut health home test. A diet rich in fiber and fermented foods may benefit both gut health and HbA1c. Evidence: mechanistic, not yet strongly supported.