 Better Life with Dr. Samjay Gupta. The summer is a great time to enjoy some really fresh produce. But first, I do want to tell you about this year's Dirty Dozen list. It's a list that's put out every year for two decades now by the Environmental Working Group of the fruits and vegetables that contain the highest amounts of pesticides. Pesticides, of course, can help farmers with their crops, but they can also have negative impacts on your health.