i don't know how practical it would be - but could you make sure there were no convenience foods like that in the house. I presuming you don't live alone, so can't clear all the decks - but if you only had the makings of something you'd have to knock up from scratch, it would be harder and take longer to cheat.
also - if you're hungry, have another pack. much, much better idea than going off plan. or, as mary says, you could consider SS+