How are HbA1c and Haut related?

HbA1c (glycated hemoglobin) reflects average blood glucose over 2–3 months. Chronically elevated HbA1c indicates poor glycemic control, which drives non-enzymatic glycation of skin proteins like collagen and elastin, forming advanced glycation end-products (AGEs). This leads to skin stiffness, loss of elasticity, yellowing, and impaired wound healing. Skin conditions such as diabetic dermopathy, acanthosis nigricans, and delayed healing are also linked to high HbA1c. The provided context does not directly address this relationship; it only mentions skin glycation in a DNA test context, which is classified as marketing without solid evidence. Therefore, this answer relies on established medical knowledge rather than the given context. The evidence for the HbA1c–skin connection is strong in diabetes research, but it is not supported by the provided materials.