Eating Organic

"Organic is ideal, but hardly mandatory, so buy it when it matters
most. Choose organic when it comes to fruits and vegetables that you eat
in their entirety - grapes, spinach, strawberries - because pesticides
can accumulate on their skin. Fruits like bananas, oranges, and lemons,
on the other hand, have thicker skins that get peeled away, so opt for
conventionally grown. Either way, though, wash them well."

-Health Magazine April 2010