Evidence check: Transferrin in the context of longevity

Transferrin is an iron-transport protein discussed in the context of longevity primarily through its role in iron metabolism. Elevated iron status (measured by ferritin, transferrin saturation) is linked to oxidative stress, inflammation, and accelerated cellular aging. Low transferrin may indicate iron deficiency, while high levels (with low saturation) can point to iron distribution disorders like hemochromatosis. However, evidence for transferrin as a direct longevity marker is weak: no large prospective studies associate isolated transferrin levels with all-cause mortality. Most data come from observational studies on iron status and age-related diseases (e.g., cardiovascular, neurodegenerative). Transferrin is also influenced by inflammation, liver function, and diet, complicating interpretation. DNA tests for transferrin gene variants (e.g., TF) have even less clinical relevance. Conclusion: Transferrin is an interesting but not established biomarker for longevity. Evidence is mechanistic to moderate. For individual health assessment, an iron status panel (ferritin, transferrin saturation, soluble transferrin receptor) is more informative.