And since when does sugar go bad? As far as I'm concerned, unless it's riddled with bugs it's just fine...just get out the grater.

I have severe doubts about the validity of this study. I'm not going to throw away the jam or my Miracle Whip...or my ketchup and mustard and relish. I've got some historic jams in my pantry according to that list...and they still taste great! So does my peanut butter.