Well, I was reading last night about chemistry and came upon a section in the book on Bose–Einstein condensate (or BEC). This basically happens when atoms get so cold (0.00001 degrees above absolute zero), they collapse on eachother to form a superatom of sorts. Something tells me that if you managed to do this to a person without killing them from cold first, it would wreak havoc on your bodies chemical processes because of these things' size. No one knows but I'd speculate your bodies appearance possibly to change too.
*Footnote, BEC acts just like the atoms it's made of in chemical processes, however I'm proposing that the size of your 'atoms' would make some chemical processes in your body possible.