Ah, a peach -- the very word is synonymous with perfection. It's also No. 1 on the Environmental Working Group's list of foods with the most and the highest concentration of pesticides [source: EWG]. The Environmental Working Group (EWG) is a nonprofit concerned with public health and the environment. Even washing and peeling couldn't remove all the pesticides from a nonorganic peach. Peeling also takes away a lot of the fruit's nutritional benefit. Peaches aren't the only culprit for pesticide contamination, though. Many fruits have high levels of pesticides. Apples and nectarines rank high on the scale of pesticide-laden foods. Strawberries absorb a lot of poison through their thin skins. You can't peel a strawberry, either. The same goes for cherries. Grapes -- and raisins -- fall under this category, as well. Many fruit juices contain grape juice, so look for the organic label there, too, especially if the juice is for kids. Buying fruit out of season is risky since standards are lax in many of the countries where it's grown.