In OZ, there's been an old adage floating around since time immemorial - "don't give red cordial to kids". Green or Yellow seems to be OK, but the Red stuff just sends them round the loop.

As for additive, I like my Diet Coke full of Phenylalanine... Hmmmmm Phenylalanine - the best way to make a long day seem so short. ^_^

(in case you didn't know, PA has been linked to short-term memory disruption under certain food combinations).