Evidence check: Ferritin in the context of Blutzucker

Ferritin is an iron-storage protein commonly used as a biomarker for body iron status. In the context of blood sugar (glucose metabolism), observational studies and meta-analyses suggest that elevated ferritin levels are associated with a higher risk of insulin resistance and type 2 diabetes. Proposed mechanisms include iron-induced oxidative stress damaging pancreatic beta cells and impairing insulin signaling. However, ferritin is also an acute-phase reactant; elevated levels can reflect either iron overload or chronic inflammation, both of which can affect glucose homeostasis. Low ferritin (iron deficiency) may cause fatigue and reduced exercise capacity, but a direct causal link to fasting blood glucose is less established. For clinical assessment, ferritin should be interpreted together with transferrin saturation, HbA1c, and fasting glucose. A single consumer test result is insufficient for diagnosis. The evidence is moderate (human-observational) but lacks large interventional trials. Always consult a physician for personalized evaluation.