saying, unless you have celiac disease, it s probably not a good idea. it s been demonstrated that if you are on a gluten-free diet long term, you can actually become b vitamin deficient. reporter: still, others swear going gluten-free makes them feel better. fueling one of the fastest growing sectors of the food market that everyone wants a slice of. sharyn alfonsi, abc news, new york. you don t have the disease, maybe you don t need to do it. that s what i get from the piece. it s a weight loss tool. now you re intrigued. that s intriguing. now you ll go home and enjoy those waffles. when we come back, the tuesday skinny and that means dancing with the stars. who is hot, who is not and who may not survive tonight s double elimination. all that and more when we come right back. announcer: abc s world news now will cont