What to watch with IgG Unverträglichkeitstest and Müdigkeit?

IgG food intolerance tests and fatigue: what to watch for. These tests measure IgG antibodies to foods, but scientific evidence linking them to symptoms like fatigue is weak. IgG antibodies often reflect normal immune exposure, not true intolerance. Professional societies (e.g., EAACI, DGAKI) advise against using IgG tests for diagnosis because they are not validated and can lead to unnecessary dietary restrictions. Fatigue has many causes—sleep deprivation, stress, iron deficiency, thyroid disorders, etc.—that should be evaluated by a physician first. An IgG test does not replace clinical workup. If you have already taken the test, do not base major dietary changes solely on its results. Instead, discuss your fatigue and test results with a doctor or registered dietitian. The evidence for IgG testing in this context is primarily marketing-driven, not clinically supported.