Myths vs facts: IgG Unverträglichkeitstest and Stress

The IgG food intolerance test is often marketed as a tool to identify stress-related reactions. However, scientifically, this test is not valid: IgG antibodies merely indicate normal immune exposure to foods, not intolerance or allergy. Studies show IgG tests lack reproducible clinical results and frequently lead to unnecessary diets. Stress can influence gut permeability and the microbiome, but an IgG test does not measure this. The evidence for the test is weak and primarily marketing-based. Consumers should rely on established diagnostics (e.g., physician-supervised elimination diet, breath tests). Caveat: The test is not diagnostic and may increase psychological burden.