We all know that if you're gluten-free, you should avoid anything with wheat ... certain bread and types of pasta. But this protein may pop up in the most unexpected places, including soy sauce ...

But gluten-free diets eliminate many popular sources of fiber, such as bread, bran, and other wheat-based products. Some gluten-free substitutes for wheat-based products are also low in fiber.

It makes bread chewy and is found in foods like pasta, pizza, beer and soy sauce ... are double-dipped after spreading on wheat (gluten) bread and gluten-free bread, cutting boards and food ...