EWG's Dirty Dozen and Clean Fifteen
I like to eat my fresh fruit and vegetables, but when doing so look to the EWG guide to pick and choose between conventional and organic items. If I grow it myself, I don't worry, but if I buy it then I don't know where it's coming from. Pesticides can be toxic to humans, especially the nervous system. So, although organics often cost more, it's a smarter choice when choosing spinach, red bell peppers or kale.
One thing I'd like to reiterate that they point out is that while corn and other grains aren't listed, they are often genetically-modified crops. These GMO grains are then used to make tortillas, chips, breads, etc. So, you might want to pay a little more and get some GMO free tortilla chips, too. While they usually also cost more, I buy a few bags when I find them on sale. I personally like Garden of Eatin' blue tortilla chips and Lundberg Rice Chips, both of which are GMO and gluten free.
I have a list of the items in my "notes" on my phone to reference in case I forget which are which. Here's the link to the EWG article. http://www.ewg.org/foodnews/summary.php
If you want to grow some of your own fruits and vegetables, try sticking to heirloom seeds sold by specialy seed companies. City Folks Farm Shop has a number of seed catalogs.
Also there is a Meetup group in central Ohio which will be having a "Seed swap" Sunday at the Karl Road Library. You can learn more about the event and join the group here http://www.meetup.com/CentralOhioSSS/