What should I know about test fur lebensmittelunvertraglichkeit?

Tests for food intolerance (e.g., IgG blood tests, genetic tests) are widely marketed directly to consumers, but the scientific evidence is weak. IgG tests measure antibodies that often reflect normal immune exposure to foods, not intolerance. Major medical societies (e.g., DGAKI, EAACI) advise against these tests because they can lead to unnecessary dietary restrictions and nutritional deficiencies. Genetic tests for lactose intolerance (MCM6 rs4988235) or celiac disease (HLA-DQ2/DQ8) have better evidence but are only useful when symptoms are present. Most commercial panels mix validated markers with questionable ones. Without a symptom diary and medical evaluation, results are often misleading. A positive IgG finding does not confirm intolerance. Costs are rarely covered by insurance. If you suspect a food intolerance, consult an allergist or gastroenterologist rather than relying on direct-to-consumer tests.