If such a person is not reactive to gluten then eating the other gluten - containing grains besides wheat (such as barley and rye) may be fine. (drdebe.com)
However, wheat - free doesn't mean gluten - free, as some wheat - free products may have gluten - containing grains like barley and rye in them. (kidshealth.org)
It contains the water extracts of barley and rye, and that is a big difference. (dandyblend.com)