GM Foods

While watching the news last night, a story came on about how there is no labelling for genetically modified foods, so we don’t know we are buying these products when we shop for food. It brought to mind a question about GM foods in general that I don’t remember ever seeing here. Does anyone know what affect (if any) they may have on bodybuilding? Should it even be a concern? If this has been covered before, please provide a link. Thanks.