Those with weak stomaches should never look into how any of their food if produced, no matter how seemingly innocuous that food is. Consider what the ground flour used to make your bread almost certainly contains, things such as tons of bugs that got caught up in the wheat as it was reaped and siloed, and then ground right along with the wheat itself. Quite honestly, however, once it's been cooked, it's nothing more than a little extra helping of protein.