1) There is no credible evidence that GM foods are harmful.
If you really care, you can start here:
http://www.owenfoundation.com/Health_Science/Pusztai/GM/Pusztai_Science_GM_Food.html
Nearly ten years after the introduction of GM foodcrops there are still only a handful of published studies about their safety. Independent studies are even fewer, moreover, no peer-reviewed publications exist in which the results of clinical investigations on the possible effects of GM food on human health are described.
The importance of toxicological/nutritional testing using laboratory animals was already recognized by the FDA (Food and Drug Administration in the USA) in 1992 by requesting Calgene# to commission the safety evaluation of FLAVR-SAVRTM tomato, the first GM crop, before it could be released. This was despite the fact that the results of chemical analyses showed that there were no significant alterations in the composition of the tomatoes and therefore the GM and parent tomatoes were "substantially equivalent."
The FLAVR-SAVRTM safety studies and their results have not been peer-reviewed or published. However, as they are now on the internet (Alliance for Biointegrity, 1998) it was possible to subject the study to independent critical scrutiny. From this it is difficult to understand how the FDA came to the conclusion that these GM tomatoes were safe and needed no further studies.
Even more importantly, no histology was done on the intestines although some of the female rats developed erosive/necrotic stomach lesions (Table 1). However, these were dismissed by the FDA because the lesions were claimed to be spontaneous/transitory and unrelated to GM tomatoes but probably due to mucolytic agents, food restriction and/or stress resulting from animal restraint. However, tomatoes are not know to contain mucolytic agents, feed was provided ad lib, rats were not restrained or stressed and all test and control rats were treated the same way.
Or this:
http://planetsave.com/blog/2009/06/...modified-gm-crops-are-harmful-to-your-health/
In order for the FDA to determine if Monsanto’s growth hormones were safe or not, Monsanto was required to submit a scientific report on that topic. Margaret Miller, one of Monsanto’s researchers put the report together.
Shortly before the report submission, Miller left Monsanto and was hired by the FDA. Her first job for the FDA was to determine whether or not to approve the report she wrote for Monsanto. In short, Monsanto approved its own report. Assisting Miller was another former Monsanto researcher, Susan Sechen. Deciding whether or not rBGH-derived milk should be labeled fell under the jurisdiction of another FDA official, Michael Taylor, who previously worked as a lawyer for Monsanto.
Theres alot of politics involved with GM food, and also if you care you can watch the video in my sig.