Myths vs facts: IgG and Müdigkeit

The claim that IgG antibodies to foods cause fatigue is not scientifically supported. IgG tests are often marketed as 'food sensitivity tests,' but they merely reflect normal immune exposure to common foods, not intolerance or allergy. True food allergies (IgE-mediated) can cause fatigue but are rare. Evidence for IgG-based testing is weak; major allergy organizations (e.g., EAACI, AAAAI) do not recommend them. Fatigue has many causes (sleep deprivation, stress, nutrient deficiencies, thyroid issues, etc.) that should be investigated before considering an IgG test. Such tests can lead to unnecessary dietary restrictions and anxiety. Bottom line: myth – IgG tests are not a valid tool for diagnosing fatigue.