Can HbA1c help with Darmgesundheit?

HbA1c is a long-term blood glucose marker primarily used for diabetes diagnosis and monitoring. There is no direct evidence that HbA1c helps assess gut health. However, poor glycemic control (high HbA1c) has been associated with altered gut microbiota composition and increased intestinal permeability in some observational studies. These associations are indirect and not causal. Gut health depends on diet, microbiome diversity, inflammation, and barrier function—none of which are directly measured by HbA1c. Consumer tests claiming HbA1c as a gut health indicator overstate the evidence. For a meaningful assessment of gut health, specific markers like fecal calprotectin, zonulin, or comprehensive stool analysis are more appropriate. In summary, HbA1c is not a validated tool for gut health; the evidence is weak and indirect.