When you bite into an apple, you pretty much know what you're getting. The same can't be said for many packaged foods, which often contain ingredients that have been "genetically modified."
Corn and soybeans, along with cotton and canola, are among the most common genetically modified (GM) crops in the United States. According to the U.S.
Department of Agriculture, an estimated 61 percent of the corn and 89 percent of the soybeans planted in 2006 were biotech varieties.
While the bulk of GM crops are destined to become animal feed, some of the bounty ends up in kitchens, restaurants and vending machines.
"Most of the processed foods that we eat -- cookies, chips, sodas, crackers -- all of those will contain some ingredients that are derived from corn or soybeans," said Michael Fernandez, executive director of the Pew Initiative on Food and Biotechnology, a nonpartisan source of information on agricultural biotechnology.