Do you know what a GMO is? I didn't have a clear understanding of the concept of GMOs until I watched this video:
After watching the video, I went through my cupboards and was shocked at the many, many things that contain GMOs, after all, corn is everywhere--corn starch, corn syrup, corn. My kids' favorite veggie? Corn. A lot of kids' foods aren't "safe" according to the video--not even Cheerios! Here's a downloadable booklet that tells you at a glance what is safe and what's not: http://www.nongmoshoppingguide.com/ I also downloaded a GMO app for my i-phone. It's not comprehensive, but I can at least
Of course, the best way is to produce your own food. Here's a great website where you can get corn seed that is NOT GMO: www.rareseeds.com. It also has some fun heirloom varieties of flowers and veggies and the history of each one.
For more info, here are some other websites:
http://www.mommypotamus.com/eyewitness-report-animals-wont-eat-gmos/ (a fun blog about a mom who did an experiment with her kids)