Transferrin is a protein that transports iron in the blood. Its direct link to weight loss („Abnehmen“) is not well established, but indirect connections exist: iron deficiency can cause fatigue and reduced physical performance, potentially hindering weight loss. Conversely, weight loss can alter iron status through dietary changes or inflammation. Evidence is mixed and mostly observational. Routine transferrin testing for weight management is not supported by strong clinical guidelines. If iron deficiency is suspected, a doctor should evaluate transferrin, ferritin, and hemoglobin in the context of overall diet and health. Consumer tests like MyBody-X may provide these markers, but they are not a standalone weight loss tool. Evidence: unclear/mixed.
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