The most obvious clues about the danger of genetically modified (GMO) foods are that just about EVERY species of animal that is offered a GMO food vs a non-GMO food will avoid the GMO one. Many times they will do this to the point of starvation, as they have an intuitive sense of the danger of this food. It has been well reported the effects of GMO foods on potential problems with fertility, birth weight of offspring & infant mortality. Now the latest research from Russia provides shocking confirmation of genetically modified foods causing sterility in future generations. Anything containing soy or soy derivatives should be avoided, as well as anything containing corn, the most obvious ingredient being high fructose corn syrup.
Sources: Institute for Responsible Technology, "Genetically Modified Soy Linked to Sterility, Infant Mortality"; The Voice of Russia April 16, 2010; Grist April 20, 2010