What role does IgG Unverträglichkeitstest play in Müdigkeit?

IgG food intolerance tests are often marketed as a solution for fatigue, but the scientific evidence is weak. The IgG antibodies measured typically reflect normal immune exposure to foods, not intolerance. Medical guidelines advise against these tests because they cannot reliably distinguish between tolerance and intolerance. Fatigue has many potential causes—poor sleep, stress, iron deficiency, thyroid issues, and more. An IgG test does not provide a valid diagnosis for fatigue. Instead, consult a doctor for evidence-based blood work (e.g., ferritin, vitamin B12, TSH). Claims that eliminating foods based on IgG results will resolve fatigue are not supported by robust clinical studies. Evidence: marketing/unclear. Caution: these tests are often expensive and lack clinical utility.