Kids with ADHD have higher levels of pesticides in their systems (on average) so there is probably a environmental component to it
THIS... (frustrated sigh). My DS9 who loves his fruits and veggies (he eats much better than DD11) is the one with the ADHD (combined) diagnosis. I tried organic and it cost a fortune... and I didn't really see a difference, so I'm inclined to think that part of his issues were developmental at the time (this was several years ago). I'm glad to be reading this thread, though, because now that he's a bit older and has changed and improved (ie developed!) I might try organics again.