What role does IgG Unverträglichkeitstest play in gut health?

IgG food intolerance tests are often marketed to identify food sensitivities and improve gut health, but the scientific evidence is weak. Elevated IgG levels typically reflect normal immune exposure to foods, not intolerance or gut pathology. No robust studies show that avoiding IgG-positive foods improves gut health or symptoms. Professional guidelines (e.g., EAACI) advise against using IgG tests for diagnosis. For gut health, evidence-based approaches include symptom diaries, elimination diets under supervision, and validated tests (e.g., lactose breath test). These IgG tests are best considered commercial products, not clinical tools.