Sounds interesting, but how much time would our bodies need to accomodate for that? I think the peristaltic movements of our intestines are important or otherwise the intestines would start to malfunction and cause more serious problems (but I’m not really an expert on that).
That also seems to be one of the reasons Soylent contains lots of fibre (or our diet in general should) - so that the waste gets formed into solid chunks that travel and cause the intestines to move. Sounds like a self-feeding loop but that’s how it currently works, as far as I know.
Maybe the solution is to…remove the intestines completely and insert nutrition directly to our blood system!