What to watch with IgG Unverträglichkeitstest and Allergie?

IgG food intolerance tests are commercially marketed tests that measure IgG antibodies to foods. Major allergy and immunology organizations (e.g., EAACI, AAAAI) do not recommend them because IgG antibodies are often a normal immune response to food proteins and do not reliably indicate intolerance or allergy. The evidence for their clinical utility is weak; studies show high rates of false positives and poor reproducibility. Relying on such tests can lead to unnecessary dietary restrictions, nutritional deficiencies, and anxiety. For suspected food allergy or intolerance, proper medical evaluation using validated methods (skin prick test, specific IgE, medically supervised elimination diet) is essential. The provided context on vitamin upper limits and DNA tests highlights the importance of evidence-based practice and the risk of marketing-driven claims. Caveat: single lab values without clinical correlation are not diagnostic.