Interesting article on Huffington Post about organic foods. Here's an excerpt:
The "dirty dozen" are 12 fruits and veggies that, even when washed, tend to maintain high levels of pesticide residue unless they're grown organically. They are: apples, bell peppers, celery, cherries, spinach, strawberries, imported grapes, nectarines, peaches, pears, potatoes and raspberries. Meat, poultry, eggs and dairy products should also be bought organic, to cut down on exposure to hormones, antibiotics and disease-causing agents.