Your reaction to bread does not have anything to do with GMOs. No wheat flour is from GMO wheat, at least not any in the US. As far as I know, there is no such thing as GMO wheat.
Take a look at the artificial additives (B group of vitamins) that have been mandated by Congress and must appear in bread, next time you see a label. My point was, my body can handle that stuff. Mr Peel’s cannot handle syntethic additives (the vitamins, the sugar, etc). His diet needs to be as pure as possible. He can have grain, he can have sugar — providing they are pure. Genetically modified foods (grains, legumes, etc) are not pure and affect him terribly.
Just for Ref:
http://www.gmo-compass.org/eng/grocery_shopping/crops/22.genetically_modified_wheat.html
“Right now ,no genetically modified wheat is being grown anywhere in the world.”