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.
"Binging is a descent into a world where every restriction... is cut loose. At its core is a feeling of deprivation.. a feeling you can never get enough. Binges do not signify a lack of willpower or inability to care for yourself. On the contrary, binges are a urgent attempt to care for yourself when you feel uncared for. They are the voice of survival. Binges are the mark of the self that says, 'I am tired of feeling deprived, of being told I am wrong, that I am bad." - Geneen Roth