Common mistakes around longevity genetics include overestimating the predictive power of DNA tests and neglecting biomarker blood work. Many consumers assume a genetic test alone can tell them exactly which supplements or lifestyle changes to make. However, evidence shows that effect sizes for most variants (e.g., MTHFR C677T, PPARA L162V) are small and rarely justify standalone recommendations. Another mistake is confusing marketing with science: some companies promote 'longevity DNA tests' with circadian genes (CLOCK/PER), but the genetic influence on sleep and lifespan is modest and heavily modified by environment. Additionally, people overlook that blood biomarkers (e.g., vitamin B12, cortisol) are more current and actionable than genetic risk scores. Assuming that rare monogenic variants like MC4R mutations apply to all longevity tests is misleading – most variants have only weak effects. Safety note: taking hormones or supplements without medical diagnosis (e.g., low cortisol) can be dangerous. Conclusion: longevity genetics is a complementary piece, not a decision-maker. Combine DNA with biomarkers, lifestyle, and medical advice.
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