Myths vs facts: IgG Unverträglichkeitstest and Müdigkeit

The IgG food intolerance test is often marketed to identify foods that supposedly cause fatigue. Scientifically, this test is not valid. IgG antibodies to foods simply indicate immune exposure—a normal finding in healthy individuals—and do not signify intolerance or allergy. Major allergy and immunology societies (EAACI, AAAAI) explicitly advise against using IgG tests for diagnosis, as they can lead to unnecessary dietary restrictions, nutritional deficiencies, and misdiagnosis. The claimed link between IgG reactions and fatigue is not supported by controlled studies. Fatigue has many potential causes (sleep deprivation, stress, iron deficiency, thyroid dysfunction, etc.) that require proper medical evaluation. The test is a marketing tool, not a diagnostic instrument. Evidence: human-moderate (based on clinical guidelines). Sources: none from provided context.