How are IgG Unverträglichkeitstest and Schlaf related?

The relationship between IgG intolerance tests and sleep is poorly supported by scientific evidence. IgG tests are often marketed as food intolerance tests, but they measure IgG antibodies, which primarily reflect a normal immune response to foods and are not indicative of true allergies or intolerances. The claim that eliminating IgG-positive foods improves sleep quality relies on anecdotal reports rather than controlled studies. Sleep disturbances can stem from many factors—stress, hormones, micronutrient deficiencies, or sleep disorders. An IgG test does not provide a reliable diagnosis for sleep issues. The provided context documents contain no direct information linking IgG tests to sleep. Therefore, the evidence level is 'marketing': the claim is commonly promoted but lacks robust scientific backing. Individuals with sleep concerns should consult a physician and pursue evidence-based diagnostic approaches.