What role does HbA1c play in Darmgesundheit?

HbA1c (glycated hemoglobin) is a well-established biomarker for average blood glucose over the past 2–3 months, primarily used for diabetes diagnosis and monitoring. Regarding gut health, there is moderate human evidence that impaired gut barrier function (leaky gut) and gut microbiome dysbiosis can contribute to systemic inflammation and insulin resistance, which may in turn affect HbA1c levels. However, the evidence is not strong enough to establish a direct causal role of gut health on HbA1c. Observational studies show associations between certain gut bacteria and glycemic markers, but interventional data are limited. Therefore, HbA1c should not be interpreted as a direct measure of gut health. Consumer tests linking HbA1c to gut health are often marketing-driven and lack robust scientific backing. If HbA1c is elevated, a medical workup (e.g., oral glucose tolerance test, stool analysis) is recommended rather than self-diagnosis.