Evidence check: Zöliakie Test in the context of skin aging

A celiac test (e.g., IgA antibodies against tissue transglutaminase) can detect untreated celiac disease, which is associated with skin manifestations such as dermatitis herpetiformis. However, this skin condition is not synonymous with general skin aging. While a gluten-free diet improves skin symptoms in celiac patients, there is insufficient evidence that a celiac test in individuals without suspected celiac disease has a measurable impact on skin aging. The evidence is weak, based on observational studies and mechanistic reasoning. A positive test does not necessarily indicate clinically relevant celiac disease; false positives are common. For skin aging, factors like UV exposure, diet, hormones, and genetics are far more relevant. Therefore, the test should only be used when celiac disease or dermatitis herpetiformis is suspected, not as an anti-aging tool. Overall, the evidence for the celiac test in the context of skin aging is insufficient.