This dudes creating a bare bones shake for programmers and computer geeks - inspired by science fiction - that replaces 2-3 meals a day:
I think I would go for it to replace a meal or two. Or give me a way to be in a virtual interface for multiple days without having to leave my VR pod. This is the future man... bio-paste.
Check out his entire blog there's some thorough breakdowns and pseudo-science he's approaching the problem with.