Thank you both for your opinions and info. I just looked up "reactive hypoglycemia in gifted children" and it certainly fits. Wouldn't it be nice if I could resolve the meltdowns and intense behavior with diet change and frequent snacks? I'm not holding my breath, but it's worth a shot. I think I will talk to the pediatrician about it just in case. The behavior is severe, and when he hits the point of no return there's no reasoning with him, but literally seconds to minutes after eating, he's a different kid. We've always thought it was strange, these extreme mood changes related to food. We thought he'd eventually learn to recognize when he needed food, and this would be resolved. Not so far! Anyway, thanks again. It's worth checking into.
Here's a good blog I found with lots of info and others with similar experience if anyone is interested.
http://www.reactivehypoglycemia.info/articles/reactive-hypoglycemia-in-highly-gifted-children/
