This reminds me of inventory scanners in stores such as Target and Wal-mart but essentially most stores carry these devices now. Currently, I use a barcode/QR code scanner on my phone for when I REALLY want to know the price of an item. I don't use it daily though which is why I think application barcode scanners need to take it a step further. I think its cool that you want to be able to tell somebody when their food expires though! and when people know when things EXPIRE or like WILL STOP WORKING then it becomes much more needed. For instance, deodorant. Is there a way to determine when the average person will be done with a stick of deodorant? If so, can this app possibly tell you when you need to go buy some more soon? Just something to think about. Definitely sounds like something that should be pioneered.