OK, this is a bit aged. But the discussion of the negative health effects of GMO foods needs to reach back a bit to find good articles explaining HOW GMO foods are harming our health. This one explains that herbicides can bite back after you've eaten the GMO corn!
When eating Liberty Link corn, we not only consume NAG, but also the pat and bar genes with their pat and bar proteins. It is possible that when NAG is converted to herbicide in our gut, the pat protein, for example, might reconvert some of the herbicide back to NAG. This might lower concentrations of glufosinate inside of our gut. On the other hand, some microorganisms may be able to convert in both directions, from glufosinate to NAG and also back again. If the pat protein can do this, that is, if it can transform NAG to herbicide, than the presence of the pat protein inside our gut might regenerate more herbicide from the ingested NAG. Since there are no public studies on this, we do not know if consuming the pat gene or bar genes will make the situation better or worse.