So, had this idea this morning. It'd be a pretty big undertaking, but its potential for helping the hungry seems real. How feasible would this be?
What if you could track foods you *didn't* eat, and their price? Then, at the end of the month, say, you get a button that lets you click to donate the amount you saved to the IRC or some other reputable charity. So, along with breakfast/lunch/dinner/snacks, you have a category called "resisted", which tracks prices as well as calories.
The more junk foods you resist, the more you're donating to help the hungry. So when you look at an Oreo, you see the hungry people you could help by not eating it. Maybe it only adds up to $5 or $10 a month, but maybe it's more. Maybe you get to choose an actual amount you want to donate.