Is HbA1c useful for Langlebigkeit?

HbA1c (glycated hemoglobin) is a well-established biomarker reflecting average blood glucose over the past 2–3 months. In longevity research, a low-normal HbA1c (e.g., 5.0–5.6%) is associated with reduced glycation, lower oxidative stress, and decreased risk of age-related diseases like type 2 diabetes, cardiovascular disease, and cognitive decline. The evidence is human-strong: large prospective cohort studies (e.g., NHANES, ARIC) show a U-shaped relationship—both too high and too low values correlate with increased mortality. However, HbA1c is not a standalone longevity marker. It must be interpreted alongside fasting glucose, insulin resistance (HOMA-IR), inflammatory markers (CRP), and lifestyle factors (diet, exercise, sleep). Consumer blood tests (e.g., MyBody-X) can measure HbA1c, but accuracy varies; clinical confirmation is advised for abnormal results. Additionally, hemoglobin variants (e.g., sickle cell trait) or kidney function can affect readings. In summary, HbA1c is a useful piece of the longevity puzzle but not a magic bullet. The evidence is strong, but interpretation requires medical guidance.