It's wonderful to make an informed choice but to so so without having a clue just goes to show you how gullible we are to food fads. I highly doubt those people are gluten free to be honest. Nobody makes such a drastic dietary change without knowing at least something.
"If you pay attention to when you are hungry, what your body wants, what you are eating, when you've had enough, you end the obsession because obsession and awareness cannot coexist." - Geneen Roth