So I ran across this article in the New Yorker, it is long, really long. But it is part of an investigation with what the **** is up with gluten. As it seems and some recent studies show, gluten may not necessarily be the problem.
http://www.newyorker.com/magazine/2014/11/03/grain
In the end, if you have gastric distress, you may need to follow a fodmap diet to see what exactly is causing the issue. If you are eating breads with added gluten, it may be because they are trying to short cut the whole grain bread baking process which may cause gastric distress.