Food Expiration Dates

My daughter drives me crazy with that. She will say something is expired and want to throw it away. Matter of fact last night she wanted to make Jello and the ones i has in the cabinet had expired in Decemeber. I was like, its fine, its just pretty much pure sugar.. But i have to explain to her with milk and bread. They are both usually good past the best buy date, all you have to do is check it, If the milk smells bad, don't drink it, if the bread smells or looks bad, don't eat it..