Can IgG Unverträglichkeitstest help with Blutzucker?

No, an IgG intolerance test is not a validated tool for blood sugar control. Major allergy and immunology societies (EAACI, AAAAI, DGAKI) explicitly recommend against using IgG/IgG4 tests for diagnosing food intolerances. The IgG antibodies measured typically reflect normal immune exposure to food proteins, not a pathological reaction or metabolic dysfunction. Blood sugar regulation depends on carbohydrate intake, insulin sensitivity, physical activity, and medication – not on IgG profiles. Marketing claims linking IgG tests to metabolism or blood sugar lack scientific evidence. A DNA metabolism test (e.g., MyBody-X Stoffwechselanalyse) may include genetic variants like rs1260326 in glucose metabolism, but effect sizes are too small for individual dietary recommendations. For evidence-based blood sugar management, consult a physician, monitor glucose, consider HbA1c, and adjust diet based on glycemic index and carbohydrate counting. High-dose zinc for blood sugar control can cause copper deficiency and should be avoided. Conclusion: IgG intolerance tests are not useful for blood sugar and are discouraged by clinical guidelines.