When is IgG Unverträglichkeit Alltag actually useful?

IgG-based food intolerance tests are widely marketed for everyday use, but the scientific consensus is clear: they are not useful for diagnosing food intolerances. The IgG antibodies measured are often a normal immune response to food proteins, indicating exposure and tolerance, not intolerance. Multiple studies show poor reproducibility, high false-positive rates, and no consistent correlation with reported symptoms like bloating, fatigue, or headaches. Major allergy and immunology societies (e.g., EAACI, AAAAI) explicitly recommend against using IgG tests for food intolerance diagnosis. A limited research application exists for IgG4 monitoring in specific conditions like eosinophilic esophagitis, but this is not an everyday consumer scenario. For the general public, these tests lack clinical validity and can lead to unnecessary dietary restrictions and anxiety. Evidence: human-moderate (negative evidence).