What do studies say about IgG Unverträglichkeit Ernährung?

Scientific evidence on IgG-based food intolerance tests is weak and contradictory. Many studies indicate that elevated IgG levels against foods often reflect a normal immune response and do not reliably indicate intolerance or allergy. Major medical organizations, including the European Academy of Allergy and Clinical Immunology (EAACI), advise against using IgG tests for diagnosing food intolerances due to lack of clinical validity and risk of unnecessary dietary restrictions. Some small studies report subjective improvements after IgG-guided elimination diets, but these lack placebo controls and are prone to bias. The evidence is best described as 'mixed': plausible mechanisms exist, but robust clinical proof is absent. For individuals suspecting food intolerance, validated methods such as symptom diaries, breath tests, or physician-supervised elimination diets are recommended. IgG testing should not be used as a standalone basis for dietary changes.