Myths vs facts: Ferritin and blood sugar

Myths vs facts: Ferritin and blood sugar. A common myth is that elevated ferritin always indicates iron overload and directly causes high blood sugar. In reality, ferritin is an acute-phase reactant that rises with inflammation, which itself is linked to insulin resistance and metabolic syndrome. Thus, high ferritin may reflect underlying inflammation rather than iron excess. Another myth: low ferritin is irrelevant for glucose metabolism. Fact: iron deficiency can impair insulin secretion and sensitivity, potentially disrupting blood sugar control. The evidence is mixed: observational studies show associations between ferritin and type 2 diabetes, but causality is not established in RCTs. Consumer lab tests often report ferritin without inflammatory markers (e.g., CRP) or iron panel, leading to misinterpretation. Marketing may overstate ferritin's role in blood sugar regulation. A clinical evaluation including fasting glucose, HbA1c, and iron studies is necessary for accurate assessment. Evidence grade: mixed (human-observational, no direct context).