One of the books I have suggested as necessary reading if you have food allergies or are interested in GMO information and its implications in food allergies, is Robyn O'Brien's book The Unhealthy Truth. This article is actually an excerpt from an article written by Dr. Mercola and is posted on the FoodConsumer.org site. It includes a video of Robyn O'Brien talking about some of the issues she mentions in her book.
I can't recommend this book enough. Especially to every mom out there.