For a pretty good understanding of what Glyphosate does, and how it does it, this article may be enlightening to some.
http://f1.grp.yahoofs.com/v1/YBBPTwH...teractions.pdf
The conclusions drawn sure seem to agree with many who grow nutrient dense foods. I'm told that after conservative usage of Glyphosate, on a food plot, it may never be possible to produce nutrient dense foods on that land again.