It would be nice to be able to select a recipe and have it populate your shopping list based on what is currently in your cupboards. If you just chuck stuff in the cupboards then you have to be home to know what they contain.

Or you could wear it while you cook and it could give you nutrition information for whatever it is you cooked. Armed with that it could make recommendations about what nutrients you're likely deficient in based on your recent meals and suggest recipes to remedy the gap--recipes based on what it knows is already in the cupboard.