You are right on about artificial colors, flavors, sweeteners. A teacher tried to push us into testing our son for ADD/ADHD. I scoured the internet to find out what the tests are about. They pigeon-hole them into this diagnosis: beware these tests don't diagnos anything. I found as a result:
The Feingold Diet
It's a life saver. Attitude changes, my child was willful, he didn't have any motivation to do school work. After the diet, he can sit down and study. He's a smart boy, but didn't feel any motivation for schoolwork. Here's a link to feingold:
http://www.feingold.org/dyslexia.php
Kari