Referring back to your original post it appears you prefer a light or pilsner style of beer. I really enjoy a good pilsner myself, especially one with a strong hop flavour. Hoppy is not everyone's cup of tea though. In any case, keep looking for & trying pilsners from different producers until you find one that suits your taste & doesn't have any GMO corn. I'm quite surprised to find that any kind of corn is actually an ingredient for beer! Going by the 1516 Rheinheitsgebot, water, barley & hops are the only allowable ingredients in beer made to that standard. Of course you need yeast as well, but it wasn't mentioned in the original text of the law. I haven't checked to see if there's any GMO barley out there yet, chances are there is, but if you stick to beer made to the 1516 standard, you'll be less likely to come across GMO ingredients.
I'm thinking the smaller craft breweries are more apt to follow the 1516 rule than mega breweries like Molson, Labatt, et al. And these days there's a greater selection of smaller local brewers offering Pilsners & lighter beers.
http://en.wikipedia.org/wiki/Reinheitsgebot
Okanagan Spring no longer makes a pilsner (WTF?), but if you can get hold of a 1516 Lager in Saskland, it might be close to what your taste buds crave.
http://okspring.com/1516-bavarian-lager/
I've found my tastes have changed significantly with respect to beer I enjoy as I myself 'matured' (or aged do put it bluntly). I'm liking the darker brews these days. Also don't drink my beer very cold any longer. Cold kills the flavour, particularly the darker brews. Nothing like a Backhand Of God from a craft brewer in Sorrento in Long John's Pub (shameless plugs, yes) after a morning skiing the slopes of Silver Star. That brew is so dark & thick, you can almost skip food for lunch altogether. On the other hand, a chilled Corona with a lemon or lime in the heat of summer is hard to beat.
Clearly I drink a bit more beer than Mindy! I'm kind of on the same page as Aquattro with respect to watching ingredients of what I consume very closely. Generally if it tastes real good, I'll go for it, within reason of course. I figure if it hasn't put me under the ground yet, I'll keep risking it. To each his own though. There's certainly a lot of stuff going on that we don't know about with regard to our food supply. My problem with modifying crops is companies like Monsanto (spelling?) having the power to put farmers out of business that don't use their seeds.