What role does SHBG play in longevity?

SHBG (sex hormone-binding globulin) modulates the bioavailability of testosterone and estrogen. Lower SHBG levels have been linked in observational studies to insulin resistance, metabolic syndrome, and increased cardiovascular mortality – factors that may shorten lifespan. Conversely, higher SHBG is often associated with a more favorable metabolic profile and potentially longer healthspan. However, the evidence is largely epidemiological; causal relationships are not firmly established. SHBG levels are influenced by liver function, thyroid hormones, diet, and physical activity. An isolated SHBG value without context (e.g., free hormones, insulin, glucose) has limited value for longevity assessment. The provided context does not contain specific information on SHBG. Therefore, this answer is based on general medical knowledge. A DNA test for SHBG gene variants (e.g., rs1799941) can indicate genetic predisposition but does not replace a blood measurement. Clinical lab data and medical interpretation are required for individual evaluation.