I've noticed, for years, that the kids I knew who ate huge quantities of mac n cheese ALL had learning disabilities.
So, I didn't let DD even try it till recently. (she loves it now, btw)
I thought - it's completely illogicl to think the two related, but I'll just play it safe.
Then, today, I found this story. I usually don't pay attention to these sorts of stories, but this one strikes a chord
http://saferchemicals.org/newsroom/toxic-industrial-chemicals-found-in-10-varieties-of-macaroni-and-cheese-powders/