Fasting Insulin is a crucial biomarker for assessing longevity. Elevated levels of fasting insulin are associated with insulin resistance, a precursor to type 2 diabetes and other chronic diseases. Maintaining optimal fasting insulin levels through a balanced diet and regular physical activity is essential for promoting longevity and overall health. As a longevity expert, I recommend monitoring fasting insulin levels as part of a comprehensive biomarker panel to evaluate metabolic health and guide personalized interventions for healthy aging. By addressing imbalances in fasting insulin, individuals can optimize their longevity potential and decrease the risk of age-related chronic diseases.