What to watch with HbA1c and Haut?

HbA1c (glycated hemoglobin) reflects average blood glucose over 2–3 months. Elevated levels (≥5.7% prediabetes, ≥6.5% diabetes) can affect skin health through advanced glycation end-products (AGEs) that damage collagen and elastin, leading to premature aging, dryness, and reduced elasticity. It also increases risk of skin infections and diabetes-specific signs like acanthosis nigricans (dark, velvety patches) or diabetic dermopathy (brownish spots on shins). Even without a diabetes diagnosis, borderline HbA1c may indicate early insulin resistance, which can manifest in the skin. Genetic variants (e.g., MTNR1B rs10830963) influence fasting glucose but skin outcomes are multifactorial. Caveat: A single HbA1c test is not diagnostic; consult a doctor for abnormal values and skin changes. Evidence is observational; RCTs linking HbA1c reduction to skin improvement are limited. Monitoring HbA1c alongside skin symptoms can provide useful clues, but lifestyle changes (diet, exercise) remain the cornerstone for both glycemic control and skin health.