Evidence check: IgG Unverträglichkeitstest in the context of Müdigkeit

IgG food intolerance tests are commonly marketed for vague symptoms like fatigue, but the scientific evidence is weak. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against using IgG tests to diagnose food intolerance, because elevated IgG levels often reflect normal immune exposure to foods, not pathology. No robust clinical trials show that eliminating foods based on IgG results reduces fatigue. Fatigue has many potential causes—sleep disorders, thyroid issues, stress, nutrient deficiencies—and focusing on an unvalidated test may delay proper diagnosis. The evidence grade is 'unclear' (marketing-driven). Caveat: These tests are not covered by most health insurances and should not replace a medical workup. If you suspect a food-related issue, consider an evidence-based elimination diet under professional guidance, not a commercial IgG panel.