Is IgG Unverträglichkeitstest useful for weight loss?

The short answer: No. IgG food intolerance tests are not scientifically validated as a tool for weight loss. These tests measure IgG antibodies to foods, which often reflect normal immune exposure rather than true intolerance or allergy. Major medical societies (e.g., the European Academy of Allergy and Clinical Immunology) advise against using IgG tests for diagnosing food sensitivities, as they lack reproducibility and clinical relevance for symptoms like bloating, fatigue, or weight gain. Weight loss is primarily achieved through a sustained calorie deficit, balanced nutrition, and physical activity. Relying on an IgG test may lead to unnecessary dietary restrictions, increased costs, and risk of nutrient deficiencies. The context provided (e.g., TCF7L2, LCT, FUT2 variants) covers unrelated genetic and microbiome markers and does not support the use of IgG testing for weight management. Consumers should focus on evidence-based strategies rather than unproven commercial tests.