Evidence check: SHBG in the context of Langlebigkeit

SHBG (sex hormone-binding globulin) is frequently discussed in the context of longevity. Observational studies consistently link low SHBG levels to insulin resistance, type 2 diabetes, metabolic syndrome, and increased cardiovascular mortality – all factors that can shorten lifespan. Conversely, higher SHBG is associated with better insulin sensitivity and favorable metabolic profiles. However, the evidence is largely associative, not causal. SHBG levels are influenced by liver function, hormonal status (estrogens, androgens), diet, exercise, and genetic variants (e.g., in the SHBG gene). Measuring SHBG alone, without clinical context, is insufficient for longevity recommendations. DNA tests for SHBG variants have limited predictive power and do not replace blood biomarker assessment. To optimize SHBG, lifestyle interventions such as weight loss, Mediterranean diet, and regular physical activity have the strongest evidence. Overall, SHBG is an interesting biomarker but not a direct longevity driver. The evidence level is 'human-observational' with mechanistic support.