Going gluten-free might be the biggest diet fad of the moment. But do you know what gluten actually is?  We've had medical professionals on Get Connected who've created complete anti-gluten diets, and other doctors who say going gluten free is actually a bad thing if you don't have a medical reason for it.  If you do decide to go gluten-free, it's probably helpful to know what gluten is before you get asked about it on national TV.