If you pick up an apple, peach or any other single piece of fruit at the supermarket, you can do some quick sleuthing to know if it was grown organically, with pesticides or with genetic modification. Check the code on the sticker. If it’s four digits long, it was grown by conventional methods. If the number has five digits, beginning with an 8, it means the produce itself—or something used in the farming process—was genetically modified. And if that five-digit code starts with 9, the food is certified organic (and therefore GMO- and pesticide-free).