Myths vs facts: IgG Unverträglichkeitstest and Sport

The IgG food intolerance test is often marketed to athletes as a tool to optimize performance by identifying 'problematic' foods. However, this is a myth. Major allergy and immunology societies (EAACI, AAAAI, DGAKI) explicitly recommend against IgG/IgG4 testing for food intolerance or allergy diagnosis. IgG antibodies to food are a normal immune response and do not indicate intolerance or allergy. For athletes, there is no robust evidence that eliminating foods based on IgG results improves performance, recovery, or gut health. In fact, unnecessary dietary restrictions can lead to nutrient deficiencies and disordered eating. The only validated approach for suspected food intolerances is a symptom-based elimination diet under professional guidance, combined with objective tests like lactose hydrogen breath test or IgE testing for allergies. In summary: IgG food intolerance tests are not supported by science and should not be used for sport nutrition advice.