I won't eat anything containing corn, or corn syrup, or high-fructose corn syrup, for a couple of reasons. First is that it's not on my diet - corn is a grain and not a vegetable. Second, the government subsidizes the corn industry heavily, and I don't want to support any subsidized products if I can help it.
It's not difficult to pass up corn in the produce section of the supermarket, but its a little harder to find out if another product I'm purchasing contains corn or corn products, although it usually just consists of reading the label.
I haven't missed corn much except for two instances - bottled bleu cheese dressing, and my favorite, ketchup.
So I was thrilled to find that Hunts ketchup no longer contains high fructose corn syrup [see this article]. I don't know if it's on the shelf yet, but I'll be sure to check next time I'm in the grocery store. Steak and ketchup, here I come!