What exactly is a GMO food, and what does "GMO" mean? GMO stands for Genetically Modified Organism, and it's a plant or a meat product that has had its DNA artificially altered in a laboratory by genes from other plants, animals, viruses, or bacteria, in order to produce foreign compounds in that food.
This type of alteration is experimental and is not found in nature. Here's an example for you; genetically modified corn has been engineered in a laboratory to produce pesticides in its own tissue. In fact, that pesticide is derived from e coli bacteria; so if you eat that corn, you are in fact eating a derivative of e Coli bacteria. You have to decide if you're comfortable feeding that to your family.
Unlike the strict safety evaluations supposedly required for the approval of new drugs (keep in mind those "safe" drugs have been shown time and again to have side effects years later that range from bothersome to causing death), the safety of genetically engineered foods for human consumption has not been adequately tested.
In fact, to date, there haven't been any long-term studies done to determine the safety of ingesting genetically engineered foods.
The United States and Canada do NOT require labeling of genetically modified foods while 50 countries have significant restrictions or bans on GMOs. These countries include UK, Germany, France, Spain, Italy, Russia, China, Japan, South Korea, Saudi Arabia, Australia, and Mexico.