I have too many thoughts on the subject and probably none of them worth a spit. There is a strong connection with children who either experience ADHD behaviors or have been diagnosed with ADHD and a deficiency of Magnesium and also essential fatty acids (often referred to as EFA) that can be found in omega-3. There is also a strong connection with behavioral disorders like ADHD and food allergies or perhaps food sensitivities. There are tests for both, but a child may have food sensitivities that do not show up on allergy tests. A child can be tested for sensitivities, but its expensive. (Some one mentioned red food dye, that is a biggy and is in a lot of the processed garbage that we pass on as food these days.) Also, as stated earlier, the cases of misdiagnosis are growing. I don't want to spurn the school systems, but with NCLB (No Child Left Behind) and increasing large classrooms, it is often easier to diagnose a disruptive child then to deal with that child. Boys are also diagnosed with far frequency then girls, which I believe is representative of the maturity levels. Boys mature later then girls and are often more hyper. Just look at the boom of AK programs. Finally, I am not skeptic of ADHD in all cases, but I am a skeptic of the pharmaceuticals who pushed Methylphenidate as a treatment for ADHD. Now, I am by no means an expert, but in my current profession I have worked with some of the more seasoned educators who have PhD’s in their field and who have spent their lives working with children who have significant cognitive disabilities. They recall a time where there was very, very few diagnosed cases of ADHD and it wasn't until the Pharmaceuticals literally went on speaking tours through the US pushing drugs like Ritalin that ADHD began to become a household name. In fact pharmaceuticals spent a lot of dollars bringing attention to this disorder in the late 60's and through out the 70's. Which of course coincided with the explosion of diagnosed cases of ADHD and a lot of sales for drugs like Ritalin. My thoughts anyways.