I also wanted to add that you may want to watch out for food additives. They can also cause a lot of physical and emotional problems. Here is an interesting article about FD&C Red 40. It is found in lots of pre-packaged food.
http://www.associatedcontent.com/art...ve_having.html
Here is an alarming excerpt from the article, "Red #3 and Red #40 are the two food coloring additives approved for use in food (by the FDA) yet if they were sprayed on weeds they would work as a pesticide."
Even as an adult I am sensitive to Red 40.
The fewer pre-packaged, processed foods we eat, the better. :)