GMO foods- means Genetically Modified organisims.
Below is the best website I have found dedicated to good science on the long term effects of GMO foods and the environment and health effects. No spin just science.
Not to be confused with an industry website called GMO.com with a nice green logo. They say that they are stating the facts only. However, numerous important misstatements of the facts make this website just an industry marking tool. The companies who sponsor this website are the major makers of GMO products, including: BASF, Bayer CropScience, Dow AgroSciences, DuPont, Monsanto Company and Syngenta. Remember these names.