The word gluten has skyrocketed in popularity and seems to carry a negative connotation, but what exactly is it? Gluten is a protein found in the grains wheat, barley and rye. Although experts think celiac disease used to be a rare disorder and once believed to affect one in every 10,000 people, it is now estimated that 2.5 million people may have celiac disease. Shockingly, only about 150,000 people have…