I found out over the Thanksgiving weekend that my sister's 4-year-old son has adverse reactions to Red Dye #40.  It makes him crazy.  I'd never heard of that before and was a little skeptical.  But sure enough, one night he was acting crazy, and we determined that he had eaten a good amount of red jello.  Could be a coincidence.  Maybe not. 

Wikipedia's entry on this seemingly harmless dye is probably the scariest thing I've ever read.  Not only is it linked with hyperactive behavior in children, but it's actually banned in several European countries.  The tendency is to think, meh, it's a harmless dye; what could it possibly do to me?  But disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene-sulfonate isn't all that harmless.  I wonder what other strange chemicals are used in the things we eat and drink on a daily basis? #health