It's to stop you counting 3 glasses of wine as 3 of your five a day, gentlegreengentlegreen only one of your five a day because more than one portion of the same thing doesn't count - "five a day" has to be five different things.
Dried instant noodles?! Blimey.Well I was having some instant noodles but they have gone bad. Who knew that noodles could even go bad?! The smell is absolutely foul