After class today, the topic of eating one's one fecal matter came up. There was a sharp divide as to how people thought the defecations would change. I realize this is a bit of an odd question but understanding it would help me understand how our body handles waste.
One theory was that the body would continually reuse some elements of the fecal matter such that, eventually and with no other input, nothing would be defecated.
Another theory was that there are elements in the fecal matter that the body would never make any use of, so it would continually get excreted (up until the person died, of course).
Could someone please explain the likely outcome of continually and only eating your own poop (assuming you could stay alive long enough)?