The United States is the world's biggest producer and consumer of genetically modified food, and the U.S.-based Monsanto company is the world's largest developer of genetically altered crops. The company has engineered crops that thrive in some of the world's worst climates and can protect themselves from diseases and pests. The U.S. has promoted these crops as part of a solution to alleviate world hunger. But many countries avoid genetically engineered plants fearing harmful long-term effects.

Last month, environmentalists and food safety groups organized a global protest against genetically modified food. Protesters in the southern city of Knoxville, Tennessee demanded labeling of genetically modified food products.

"Tell people what's in their food," said a woman protester. "Let them know if there are genetically modified organisms in their food or not.

"Corporations in collusion with our government oftentimes don't make the best decisions that are right for the long-term health of our children," said another protester.

Proponents of the genetically enhanced crops argue there is no scientific evidence that they can cause any harm, while the world's growing population raises the global demand for food.