IgG Unverträglichkeitstest: what symptoms are typical?

IgG-based food intolerance tests are commonly marketed for symptoms such as bloating, fatigue, headaches, skin rashes, joint pain, and brain fog. However, the scientific evidence linking elevated IgG levels to these symptoms is weak. Major allergy and immunology societies (e.g., EAACI, AAAAI) explicitly recommend against using IgG tests for diagnosing food intolerance, as IgG antibodies often reflect normal immune exposure rather than pathology. Many of the listed symptoms overlap with conditions like irritable bowel syndrome, stress, or other intolerances. The test does not provide a clinically valid diagnosis and may lead to unnecessary dietary restrictions or false reassurance. A proper workup should rely on evidence-based methods such as elimination diets, double-blind placebo-controlled food challenges, or IgE testing. As a direct-to-consumer product, this test should be viewed as exploratory at best, not as a basis for medical decisions.