Whole Foods is famous for offering a wide variety of organic fruits and vegetables. But organic produce, which is grown without pesticides, costs 20 percent more on average than the store's conventionally grown produce.
According to the nonprofit Environmental Working Group, soft-skinned fruits and veggies, like peaches, apples and bell peppers, retain the most amount of pesticides. So buying organic versions makes sense.
Onions, avocados and corn are practically pesticide-free whether they are organically grown or not.
Foodnews.org, the research group's website, lists conventionally grown fruits and vegetables by pesticide content.