The selling point of GMOs is that the enable farmers to use less pesticide.
Journal of American Science 2012;8(9) http://www.jofamericanscience.org
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Conclusion
The results of this study showed several changes in organs/body weight and serum biochemistry in the rats fed on GM corn. These findings indicate potential adverse health/toxic effects of GM corn and further investigations still needed.
After all, every major grain, fruit and vegetable crop has been extensively hybridized -- and hybridization is simply a form of genetic modification.