Is IgG Unverträglichkeitstest useful for gut health?

IgG food intolerance tests are frequently marketed for gut health, but scientific evidence does not support their usefulness. Most IgG antibodies to foods reflect normal immune exposure, not pathology. Professional guidelines (e.g., EAACI, DGAKI) advise against using IgG tests for diagnosing food intolerances or guiding elimination diets. They can lead to unnecessary dietary restrictions, nutritional deficiencies, and anxiety without improving gut symptoms. For gut health assessment, validated methods such as fecal calprotectin, microbiome analysis, or breath tests for lactose/fructose malabsorption are more evidence-based. If you suspect a food intolerance, keep a symptom diary and consult a gastroenterologist or dietitian. IgG tests may have a role in research but not in routine clinical practice for gut health.