I should point out that Orac found some significant flaws in the "Roundup" study (http://scienceblogs.com/insolence/2012/09/24/bad-science-on-gmos-it-reminds-me-of-the-antivaccine-movement/), which makes the conclusion rather dubious.

-- Steve is, admittedly, of the faction that points out that virtually *all* our food is genetically modified; fossilised maize from ~5kya looks more like a biggish barley stalk than a modern-day ear of corn.