Lay opinion vs evidence: IgG Unverträglichkeit Training

The claim that IgG tests can reliably identify food intolerances and be treated with a personalized elimination diet (so-called 'training') lacks scientific support. IgG antibodies to foods are a normal immune response and often indicate tolerance, not intolerance. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against these tests due to poor reproducibility and the risk of unnecessary, potentially nutritionally inadequate diets. Clinical trials have not shown consistent benefit for symptoms like bloating, fatigue, or headaches. Evidence-based approaches include double-blind placebo-controlled food challenges or validated breath tests (e.g., for lactose intolerance). The concept of 'training' the immune system via IgG-guided diets is not proven. Consumers should be wary of marketing that uses vague terms like 'intolerance training' – the evidence level is low and commercial interests often outweigh scientific rigor.