If only it were as easy as a voice in our heads screaming “Recalculating!” when we've taken that turn down the candy or chip aisle in the grocery store, then maybe diabetes and obesity wouldn’t quite be the epidemics that they are. Supervalu’s nutrition iQ comes about as close to an actual dietary GPS as you can get without affixing a Garmin to the shopping cart handle, and it’s a program that elevates the overall shopping experience to boot.