Evidence check: IgG Unverträglichkeitstest in the context of sleep

IgG food intolerance tests are often marketed for sleep issues, claiming that undetected food sensitivities disrupt sleep. However, the scientific evidence is weak. IgG antibodies to foods are a normal immune response to dietary proteins and do not reliably indicate intolerance or allergy. Systematic reviews find no consistent link between IgG test results and sleep quality. Major allergy and immunology societies (e.g., EAACI) recommend against using IgG tests for diagnosing food intolerance. Sleep disturbances are multifactorial (stress, poor sleep hygiene, medical conditions). Relying on an IgG test may lead to unnecessary dietary restrictions, nutritional deficiencies, and delay proper sleep evaluation. Evidence grade: marketing/unclear. Safety note: Do not make major diet changes based solely on IgG test results without consulting a doctor.