Evidence check: IgG Unverträglichkeitstest in the context of stress

IgG food intolerance tests are commonly marketed for identifying food sensitivities, including in the context of stress. However, scientific evidence is weak: elevated IgG levels to foods typically reflect normal immune exposure, not intolerance. Stress can alter gut permeability and immune responses, but this does not validate IgG testing for diagnosis. Guidelines (e.g., from the German Society for Allergology) advise against IgG-based tests, as they often lead to unnecessary dietary restrictions and nutritional deficiencies. MyBody-X offers such tests, but the evidence is marketing-driven. Focus on stress management and a balanced diet instead. For genuine intolerances, validated methods like lactose breath tests or supervised elimination diets are recommended.