What should I know about nahrungsmittelunvertraglichkeit test?

Food intolerance tests, especially IgG-based ones, are widely marketed but have weak scientific support. Evidence from controlled studies does not consistently show clinical benefit from eliminating foods based on IgG results. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against using IgG tests for diagnosing food intolerance or sensitivity. More reliable approaches include symptom diaries, medically supervised elimination diets, and specific breath tests for lactose, fructose, or histamine intolerance. Genetic testing (e.g., LCT gene variants) can be useful for lactose intolerance, but for most other 'food intolerance' panels the evidence is mixed or marketing-driven. Caveat: Unsupervised dietary restrictions based on unvalidated tests may lead to nutrient deficiencies. Always consult a healthcare professional before making major dietary changes.