Short for genetically modified organism; also known as genetically engineered (GE) foods. To create a GMO, scientists inject a host organism (a plant) with a foreign gene that will help it resist pesticides, pests, or freezing. Scientists also inject a virus or bacteria to encourage the foreign gene’s invasion and an antibiotic marker gene to determine if the process worked. Because debate over the safety of GMOs continues, the FDA provides testing and regulation updates. But the USDA doesn’t label genetically modified foods. The only way to be sure you’re not eating GMOs is by choosing products from certified organic producers, who do not use genetically modified seeds or ingredients.