hat reis gluten? — what does this mean exactly?

No, rice is naturally gluten-free. Gluten is a protein found in wheat, rye, barley, and their derivatives. Rice (Oryza sativa) does not contain gluten. However, processed rice products (e.g., rice flakes, rice noodles, ready meals) may be cross-contaminated with gluten if manufactured in facilities that also handle gluten-containing grains. For individuals with celiac disease or gluten sensitivity, choosing certified gluten-free rice products is advisable. The evidence for this is strong, based on decades of clinical practice and guidelines from celiac organizations. A DNA test is not needed to determine that rice is gluten-free – it is a botanical fact.