IgG Unverträglichkeitstest: which diet helps?

IgG-based food intolerance tests are often marketed to guide elimination diets, but the scientific evidence is weak. IgG antibodies to foods commonly indicate normal immune exposure, not intolerance. Studies show these tests are not reproducible and can lead to unnecessary dietary restrictions. An evidence-based approach for suspected food intolerances includes a symptom diary, a medically supervised elimination diet (e.g., low-FODMAP), and controlled reintroduction. Professional societies like the European Academy of Allergy and Clinical Immunology (EAACI) do not recommend IgG testing. Instead, targeted tests for lactose intolerance, fructose malabsorption, or celiac disease are appropriate. A generic IgG-based diet is not supported and may cause nutritional deficiencies. Caution: Do not rely on such tests; consult a doctor or dietitian.