Myths vs facts: tTG IgA and Blutzucker

tTG IgA is a specific antibody used in the diagnosis of celiac disease (gluten intolerance). A positive tTG IgA test indicates active celiac disease, not directly elevated blood sugar. However, there is an indirect link: untreated celiac disease can cause intestinal damage leading to malabsorption and nutrient deficiencies, which may impair blood sugar regulation. Additionally, celiac disease patients have an increased risk for type 1 diabetes, as both autoimmune conditions share common genetic risk factors (e.g., HLA-DQ2/DQ8). A myth is that tTG IgA directly measures blood sugar or that a gluten-free diet alone normalizes blood glucose. Fact: tTG IgA is not a blood sugar test. If blood sugar is elevated, separate diabetes diagnostics (fasting glucose, HbA1c) are needed. The evidence for the link between celiac disease and blood sugar is moderate, based on observational studies. Caution: a positive tTG IgA requires gastroenterological follow-up; a gluten-free diet should only be started after confirmed diagnosis.