Do dolls in Rozen Maiden live like a human? A question about how the Rozen Maiden dolls themselves function.  You often see them eat and drink as well as breathe.  Are these functions required for them to continue to exist?   If not, all of those flower burgers and tea was a real waste.  If so or not, what happens to all the waste from the consumed food and liquids?   

Simply stating magic is like a cop out, and not thinking about this would seem to be lazy writing. Shinku did not know what a restroom was and at times, there were 7 beings (5 dolls and 2 humans) in that house and never mention them waiting to use the restrooms for a doll's sake.  

Of course, this opens up the question about sweating and required bathing and such if they do.  They act like little humans, but they are shown to be porcelain dolls with strings holding them together.  Just doesn't add up. Thoughts?
Well they are technically dolls and they have an artificial heart. So maybe they are set to behave like normal humans but since they are dolls, they cannot sweat or excrete. I think the artificial heart (or the source of their power and the reason they can move {I forgot what it was called -_-}) destroys or burns the food they eat.

[This is just my theory]