What role does IgG Unverträglichkeitstest play in weight loss?

IgG food intolerance tests are frequently marketed for weight loss, but the scientific evidence is weak. IgG antibodies to foods are a normal immune response, often indicating exposure or tolerance rather than intolerance. Studies claiming a link between IgG reactions and weight loss are methodologically flawed, often industry-funded, and not reproducible. Any weight loss from an IgG-based elimination diet is likely due to reduced calorie intake rather than specific immune mechanisms. There is also a risk of unnecessary food avoidance and nutrient deficiencies. Major allergy and immunology societies, including the DGAKI and EAACI, advise against using IgG tests for diagnosing food intolerances. For sustainable weight loss, evidence-based strategies such as calorie control, physical activity, and behavioral change remain the gold standard. In summary, the IgG test for weight loss is a marketing claim without robust scientific support.