Evidence check: IgG in the context of Blutzucker

IgG antibody testing (especially IgG4) for food sensitivities is often marketed for various health concerns, including blood sugar management. However, the scientific evidence linking IgG levels to glycemic control is weak. Most IgG responses to foods reflect normal immune exposure, not pathology. For blood sugar assessment, validated markers such as fasting glucose, HbA1c, oral glucose tolerance test, and continuous glucose monitoring are far more reliable. Some practitioners suggest that eliminating foods with high IgG reactivity might reduce low-grade inflammation and thereby improve insulin sensitivity, but randomized controlled trials have not confirmed this for blood sugar outcomes. Moreover, IgG-based elimination diets can lead to unnecessary restrictions and nutritional deficiencies. Current guidelines from diabetes and allergy societies do not recommend IgG testing for metabolic health. Therefore, while IgG tests may be marketed for 'personalized nutrition,' their evidence base in the context of blood sugar is insufficient. Consumers should rely on standard glycemic markers and consult a healthcare professional before making dietary changes based on IgG results.