There has been a lot of debate about the dangers of Genetically Modified foods. Those who are against GM foods say that genetic modification of food stuffs is dangerous because there is no way to know how new genes will behave in a living organism and also because every time humans try to modify an environment we tend to fuck up quite badly (rabbits in Australia, killer bees in the US etc.).
Those in favour of GM products counter by saying that humans have been altering the genes of our food through selective breeding for millennia. For example wild bananas have huge seeds that make them hard to eat, it was only through breeding that we made them as wonderfully handy as they are. And think about the humble carrot; there is a theory that it’s only orange because it was bred to be orange as a happy birthday to the Dutch royal family.