Hemoglobin A1C is a critical biomarker for assessing long-term blood sugar control, particularly in individuals with diabetes or at risk for diabetes. It measures the average blood glucose levels over the past two to three months, providing valuable insights into an individual’s risk for developing complications associated with prolonged high blood sugar, such as heart disease, stroke, kidney disease, and neuropathy. In longevity research, maintaining optimal Hemoglobin A1C levels has been correlated with reduced risk of chronic diseases and improved overall health and lifespan. Regular monitoring and management of Hemoglobin A1C levels are essential for promoting longevity and preventing age-related chronic conditions.