This is a question, I've always wondered. Provided you take a decetn multivitamin, could you survive off nutrition shakes alone, with nothing else?? ie a pure liquid diet? I'm talking about just for meal replacements. You would still drink water. Also, if you did this and factored in one cheat day, would the "real food" tear your system up?? If you were going to do this, is there one meal replacement or shake you pick over another (for nutrition, not taste)