What to watch with Transferrin and longevity?

Transferrin is an iron-transport protein whose blood levels reflect iron status. Both iron deficiency and overload can promote oxidative stress and are linked to aging processes. However, there is no strong human evidence that transferrin alone is a direct marker for longevity. Genetic variants in the TF gene have small effects and are confounded by diet, inflammation, and liver function. MyBody-X tests may include transferrin-related SNPs, but effect sizes are small and not clinically validated. Elevated transferrin often indicates iron deficiency; low transferrin may suggest iron overload (hemochromatosis). Both require medical evaluation. For longevity, more robust markers include inflammatory cytokines, insulin sensitivity, and overall nutrient status. The evidence for transferrin as a longevity biomarker is unclear. Be cautious of overinterpreted genetic test results.