What role does HbA1c play in Müdigkeit?

HbA1c (glycated hemoglobin) reflects average blood glucose over 2–3 months. Elevated HbA1c (>6.5 %) indicates poorly controlled diabetes, which can cause fatigue via glucose/energy dysregulation, dehydration, or low-grade inflammation. Very low HbA1c (e.g., <5.0 %) may signal frequent hypoglycemia or excessive insulin sensitivity, also linked to tiredness. However, fatigue is multifactorial: sleep quality, stress, iron deficiency, thyroid function, and mental health often matter more. In metabolically healthy non-diabetics, HbA1c is not a primary fatigue marker. Evidence for a direct causal link between HbA1c and fatigue is moderate, mainly from observational studies in diabetics. Individual interpretation requires clinical context. Caveat: None of the provided sources directly address HbA1c or fatigue – this answer is based on general medical knowledge.