Thom asked where one might find "used food". This was explained in detail by The Yes Men in their eponymous first movie. You may remember The Yes Men as the street-theater troupe that attended the rallies opposed to Health Care Reform a couple years back posing as Billionaires, thanking "the masses" for their actions, lighting cigars with money, and explaining to anyone who would listen why Health Care Reform was such a bad thing for Billionaires.
In the last segment of "The Yes Men", they posed as McDonald's executives, and gave talks at business conventions on the subject of recycling Human waste for use as food for the "less advantaged". The idea was further expanded upon to include the possibility of multiple generations of "used food", e. g., ...
1) The waste of those who eat only "traditional" food would be processed to create 1st generation used food. This would, of course, be the most expensive kind of used food.
2) The waste of those who eat only 1st generation used food could be processed to create 2nd generation used food.
... and so on, with each successive generation being"more affordable". McDonalds (who else?) would be the first to introduce this "exciting, new form of nutrition for the masses".
They did have a better name than "used food" for it, which escapes me at the moment.
Here's the kicker - they attended several business conventions, at which their "idea" was not only treated SERIOUSLY, but generated some enthusiastic questions from their audience of 1%-ers! The one and only time the concept got any noticeable push-back, or where anyone walked out on their presentation, was when they gave it at a College.