Like the average bread meant to be highly appealing to the consumer isn't also junk food? Again, the only real sources of GMO products you are apt to find out there are corn-based (HFCS) and seed oils (soybean and canola). While you can make bread with those products, that doesn't mean you need to.

I think we can agree that there are breads that wouldn't be considered junk food, but they also wouldn't contain GMOs, because the ingredients typically used to make that type of bread literally have no GMO option anyway. (Yes, there was once a GMO wheat in the lab, but never became commercially available.)