Lay opinion vs evidence: IgG Unverträglichkeit Test

Lay opinion often holds that IgG (Immunoglobulin G) food intolerance tests reliably identify which foods cause adverse reactions. However, the scientific evidence does not support this. IgG antibodies are a normal immune response to food proteins; they indicate exposure, not intolerance. Multiple studies show no correlation between IgG levels and clinical symptoms. Major medical organizations, including the European Academy of Allergy and Clinical Immunology, advise against using IgG tests for diagnosing food intolerances. These tests are primarily marketed as lifestyle products without robust clinical validation. A positive IgG result does not mean you need to avoid that food. Instead, evidence-based approaches like lactose breath tests or physician-supervised elimination diets are recommended. The provided context lacks direct studies on IgG tests but reinforces that many commercial tests rely on weak or marketing-driven evidence. In summary, IgG intolerance tests are not scientifically supported and may lead to unnecessary dietary restrictions and anxiety.