Genetically modified organisms or transgenic organisms most used to define the crop or animal apparently normal, which, through genetic engineering techniques by transferring genes from one to the other species (plants, animals, bacteria, viruses or even human genes) can confer some new properties. The latest studies show that GM products affect the health of mammals. Once released into the environment, whether culture trials or commercial GM crops can not be controlled because they interact freely with the entire ecosystem. Surrounding conventional or organic crops can be contaminated through pollination, due to the wind or insects. Also entire biodiversity suffers from genetically modified crops resistant to insects and herbicides