Roundup (glyphosate) works on an enzyme that doesn't exist in humans, so as far as I know, you could drink the stuff and it wouldn't hurt you. That said, I agree with you that manufacturers owe you the information to make your own choice.
There are some reports that show it causes birth defects in animals and humans. There are some very small studies that showed human embryo death that placental and umbilical cord demise. Obviously human studies are limited. The problem is who’s reporting on the studies. A lot of times it’s “greeny” type organizations and while I think probably most of the time their concerns are overstated, there is some truth to what they report. The other side is the government telling us there’s absolutely nothing wrong with it, and I’m equally reluctant to believe that. There was a HuffPo artical that cited a review by the gov’t of Argentina that thought it was likely that glyphosate was causing those issues.
Again, as you agreed, give me all the information and let me make my own decision. If someone else wants to eat that stuff, fine by me. In the last year and a half I’ve been pregnant and now breastfeeding; I don’t want it! Unfortunately the only way to know that you’re not getting GM food is to buy organic because for now GM is not allowed in organic foods. I don’t necessarily think organic has any more or better nutrients in it, but I know it doesn’t have RoundUp and pesticides on/in it.