Another, keener health risk concerns something I heard about The Omnivore's Dilemma. The problem with some GM foods I hear is that they are far lower in nutritional value than other foods.

It's been a while since I looked this up, but if memory serves several GM crops have been modified to produce extra nutrients. Except for knock-on effects of modification for e.g pesticide resistance I don't see any reason why someone would engineer nutrients out of a crop. And of course, if you eat a balanced diet with a variety of foods you'll probably be fine nutrition-wise.