PBS - harvest of fear: should we grow gm crops?: full arguments:
"What if you knew that detractors fear that GM foods might pose health risks for certain people?
Some people, including children, are highly allergic to peanuts and other foods. Some critics of GM foods feel the possibility exists that those genetically modifying food crops may unintentionally introduce a new allergen. Given that genes can be introduced from unrelated species -- for example, a fish gene can be put into a plant -- some critics argue that the possibilities of allergies might be greater than with traditionally bred crops.
Another potential hazard to human health is the possibility that bacteria in our guts could pick up antibiotic-resistance genes found in many GM foodstuffs. (Food geneticists often add such genes to GM plants as 'markers' to tell them which plants have taken up exotic genes.) If this transfer happens, in principle it could exacerbate the already worrisome spread of disease-causing bacteria that have proven able to withstand our antibiotics."
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