Because the harmful effects of pesticides are worrisome, not well understood, or in some cases completely unstudied, it's wise for us to limit exposure to pesticides whenever possible. Although washing fresh produce can reduce levels of some pesticides, it does not eliminate them. Peeling also reduces exposures, but important nutrients often get thrown away with the peel. The best choice is to eat a varied diet, wash all produce, and select organic when possible to lower exposure to potentially toxic chemicals.
Since many of us can't always buy organic then it helps to know what conventional foods are safer choices. The Environmental Working Group (EWG) conducted a study to see which fruits and vegetables had the highest and lowest levels of pesticides. The EWG's computer analysis found that we can cut our pesticide exposure by almost 90% by avoiding the most contaminated conventional fruits and veggies and eating the least contaminated instead. Here's what they found: