Myths vs facts: Ferritin Eisenmangel and blood sugar

Myths vs facts: Ferritin, iron deficiency, and blood sugar. A common myth is that low ferritin always means iron deficiency and directly impacts blood sugar. In reality, ferritin is an acute-phase reactant; inflammation can elevate ferritin, masking true deficiency. Another myth: high ferritin always indicates iron overload – it can also rise in chronic inflammation, metabolic syndrome, or liver disease. The link to blood sugar is complex: iron deficiency can falsely elevate HbA1c, while iron overload may worsen insulin resistance. However, these associations are not strong enough to derive clinical decisions from a single ferritin self-test. Facts: A ferritin test provides orienting information about iron stores but requires CRP and clinical context for interpretation. Blood sugar is influenced by diet, exercise, stress, and hormones. Evidence for a direct causal link between ferritin and blood sugar is moderate, based on observational studies. Caveat: Self-tests cannot replace medical diagnosis. If abnormal, consult a doctor for CRP, transferrin saturation, and fasting glucose.