What to watch with IgG Unverträglichkeitstest and Blutzucker?

IgG food intolerance tests are scientifically controversial. Elevated IgG levels typically reflect immune exposure (e.g., after eating a food), not true intolerance or allergy. Major allergy societies (e.g., EAACI, DGAKI) advise against using these tests for diagnosis, as they often lead to unnecessary dietary restrictions and nutrient deficiencies. There is no established link between IgG test results and blood sugar regulation. For assessing glucose metabolism, validated methods such as fasting glucose, HbA1c, continuous glucose monitoring (CGM), or oral glucose tolerance tests are essential. Some direct-to-consumer DNA tests claim to predict food sensitivities or blood sugar responses, but evidence is weak and often based on small studies. Combining IgG results with blood sugar advice is marketing, not evidence-based medicine. If you suspect a real food intolerance (lactose, fructose, histamine), consult a physician for proper testing (e.g., hydrogen breath test, elimination diet). Always be cautious of commercial panels that promise personalized nutrition without robust clinical validation.