How are IgG Unverträglichkeitstest and Allergie related?

IgG food intolerance tests are often marketed as a way to identify food sensitivities or allergies, but they are fundamentally different from true allergy testing. Allergies are mediated by IgE antibodies and can cause acute, severe reactions. IgG antibodies, in contrast, indicate prior exposure to a food protein and are part of normal immune memory. Many healthy individuals have elevated IgG to foods they regularly eat without any symptoms. Major allergy societies (e.g., EAACI, AAAAI) explicitly recommend against using IgG tests for diagnosing food allergies or intolerances due to lack of clinical validity and risk of unnecessary dietary restrictions. MyBody-X offers these tests as lifestyle products, not medical diagnostics. The evidence level is mixed: there is mechanistic plausibility but no robust clinical evidence supporting their use for diagnosis. Consumers should not equate a positive IgG result with an allergy and should consult a doctor for proper evaluation.