What should I know about IgG Unverträglichkeit Training?

The concept of IgG intolerance training (also called IgG-based elimination diet or 'IgG training') is promoted by some providers as a method to 'train' the body to tolerate foods by avoiding and then reintroducing them based on IgG antibody levels. However, the scientific evidence is weak. IgG antibodies against food are a normal immune response in healthy individuals and are not considered reliable markers for food intolerance or allergy. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against using IgG tests to diagnose food intolerances, as they often lead to unnecessary dietary restrictions and misinterpretation. A 'training' approach based on such tests lacks robust clinical validation. For persistent symptoms like bloating or abdominal discomfort, proper medical evaluation (e.g., breath tests for lactose/fructose malabsorption, or a supervised elimination diet) is recommended. The evidence for IgG intolerance training is best categorized as 'practice' (common practice without strong trial support), not evidence-based medicine.