as recently said in Scientific American, lots of well educated guys are among this group, such as usually science-friendly democratic leftie, and liberal europeans. recent writings in Discover and Businesswek all showed strong anti-GMO sentiments. basically nowadays there's a popular idea "nature=best". every kind of food if you label it as natural, or whole, it gets the vote from middle to upper class who usually are well educated.

ironically on this issue, red neck GOPs are more likely to support GMO.

and also there's an interesting writing in atlantic
http://www.theatlantic.com/magazine/archive/2013/07/how-junk-food-can-end-obesity/309396/

arguing for so called junk food