SHBG (sex hormone-binding globulin) is a key biomarker for longevity, as it correlates with insulin resistance, metabolic health, and hormone regulation. Low SHBG levels are often linked to increased risk of type 2 diabetes, metabolic syndrome, and cardiovascular disease, which can impact lifespan. Genetic variants (e.g., in the SHBG gene) can modulate SHBG levels, but the effect is modest and overshadowed by lifestyle factors such as diet, exercise, and body weight. A DNA test like the Longevity test may flag certain SNPs, but it cannot replace clinical assessment. Regular serum SHBG measurement, along with free testosterone, estradiol, and HbA1c, is more informative. If values are abnormal, consult a physician. Evidence for direct genetic prediction is limited; focus on measurable biomarkers and lifestyle optimization.
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