Is IgG Unverträglichkeitstest useful for Darmgesundheit?

IgG food intolerance tests are often marketed for gut health, but the scientific evidence is weak. The presence of IgG antibodies typically indicates prior exposure to food proteins, not an adverse reaction. Multiple professional societies (e.g., EAACI, DGAKI) advise against using IgG tests for diagnosing food intolerances or guiding elimination diets. Studies show poor reproducibility and no consistent link to gut symptoms like bloating or IBS. For gut health, validated tests such as stool microbiome analysis, lactulose/mannitol permeability tests, or breath tests for SIBO are more evidence-based. Therefore, IgG Unverträglichkeitstests are not recommended for assessing or improving gut health. Evidence: marketing/unclear.