Is HbA1c useful for Darmgesundheit?

HbA1c is not a direct marker for gut health; it is a well-established indicator of average blood glucose control over the past 2–3 months. Current research suggests interactions between the gut microbiome and glucose metabolism – certain bacteria can influence insulin sensitivity and thus potentially affect HbA1c levels over time. However, the evidence for using HbA1c specifically to assess gut health is weak and largely indirect. Clinically, HbA1c is used for diabetes diagnosis and monitoring, not for gut diagnostics. If you want to improve gut health, you should focus on specific markers like calprotectin, zonulin, or a comprehensive stool analysis. HbA1c can be part of a broader metabolic check (e.g., in the Hormone & VitalCheck for Men) and may hint at metabolic imbalances linked to the gut flora, but it does not replace targeted gut testing. The evidence level is 'mixed': there are mechanistic and observational studies, but no strong clinical recommendation for this purpose.