Glucose regulation markers, including HbA1c (a three-month average of blood sugar), fasting glucose, and increasingly continuous glucose monitor (CGM) data, track how well the body manages blood sugar over time. Chronic dysregulation, the gradual decline in insulin sensitivity and glucose control that often accompanies aging, is mechanistically linked to several of the core pathways longevity researchers study, including the mTOR nutrient-sensing pathway covered in the gene therapy entry, and is a well-established driver of cardiovascular and metabolic disease risk.
These markers carry the strongest clinical pedigree of any biomarker category in this directory: HbA1c and fasting glucose are standard diagnostic tools for diabetes and prediabetes, used in clinical practice for decades, well before longevity research adopted them as general metabolic-aging indicators. The newer addition is consumer CGM devices, which give continuous, real-world glucose data rather than a single blood draw, an example of how wearable and AI-assisted health tracking is extending clinically validated biomarkers into everyday self-monitoring, part of the broader personalized-medicine trend this site follows.
Of all the biomarkers tracked here, glucose regulation is arguably the most actionable: diet, exercise, sleep, and body composition all directly and measurably affect it, making it a practical entry point for readers who want a biomarker that's both well-validated and within their own control.