Who says pizza dough has to contain wheat? As awareness spread concerning Celiac disease, which makes sufferers intolerant of gluten, a protein complex in wheat, restaurants and food manufacturers developed gluten-free products. Among them, the Godfather’s and Domino’s pizza chains began testing gluten-free pizza crust in 2010, and now both offer gluten-free pizza in all locations—for about $3 extra at Domino’s. In recent years, there has also been a more general push for healthier pizza, seen with the growth of the Naked Pizza franchise and the team of Scottish researchers who introduced “nutritionally balanced” pizzas last summer.