NutriCheck I Unverträglichkeits-Test: which blood markers matter?

The NutriCheck I Unverträglichkeits-Test is a direct-to-consumer test that typically measures IgG antibodies against various foods. However, the clinical relevance of these markers is controversial. While IgG responses may indicate immune exposure, they are not reliable indicators of true food intolerance or allergy. Professional societies such as the German Society for Allergology and Clinical Immunology (DGAKI) advise against such IgG-based tests, as they often yield false positives and lead to unnecessary dietary restrictions. Measured markers usually include IgG1-4 subclasses against a broad panel of foods, and sometimes total IgE or specific IgE – the latter being more appropriate for diagnosing immediate-type allergies. Without medical interpretation, results can be misleading. A more evidence-based approach for suspected intolerances is a symptom-guided elimination diet under professional supervision. The evidence supporting the clinical utility of these consumer tests is weak; they are marketed as lifestyle products rather than diagnostic tools. Therefore, results should not be used as the sole basis for dietary changes.