It seems everyone is on a gluten-free diet these days. But does anyone actually know what gluten is? Asap Science explains that, simply put, gluten is just a protein that gives dough it’s stretchy goodness. Think chewy pizza dough which is made with high-gluten flour. So why is everyone against it? Besides for people who are allergic to gluten, there is really no reason not to eat it. Chalk it up as yet another food fad that has little to no basis in science or reality.