Corn is everywhere in the United States. In fact, the U.S. is the largest producer of corn in the world. Corn is a fixture of U.S. landscapes, food and even industrial chemicals. It's also one of the most heavily modified crops. In 2000, the U.S. Department of Agriculture estimated that 25 percent of corn crops growing in the United States contained genetically modified corn. Products containing corn include beer, salad dressing, margarine, flour and, of course, anything that has corn syrup.
So, are we eating genetically modified corn? That's a tough one. While most genetically modified corn isn't destined for human consumption, one of the biggest concerns in transgenic corn is the possibility of GM corn corrupting unmodified strains. Corn is wind-pollinated, which means that nearby fields can become unintentionally contaminated. The affected area can be great -- in 2001, for instance, scientists even found GM material in wild corn in Mexico.