system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible to make a food that only has required nutrients in it, such that excretion is not required after eating it?
gpt
No.  Feces is not just "undigested" food.  It's about 30% bacteria and other waste products from your body, like dead red blood cells.  Even if you could eat to produce no waste, you'd still have cellular waste that would need to be excreted.