Our bodies are miraculous, but....

It has occurred to me that, when God was creating us, he must've decided to outsource the development of our digestive systems to someone who was a professional plumber, who figured to benefit bigtime from his design. I want to know why our intestines and organs weren't set up to utilize - totally - what we eat so that we wouldn't have to deal with leftovers that require regular releasing. Take a minute and think of the improvement in our world - in every facet imaginable. Does anyone have a plan that would accomplish such a thing? If so, notify me, and we'll take it to the logical place for such miracles: Hollywood.