This article is from the Star Trek Tech FAQ, by Joshua Bell inexorabletash@hotmail.com with numerous contributions by others.
One would hope the Holodeck is smart enough to clean up after you. It
probably gets transmuted into some form the bulk matter stores can
use, and saved for later use by replicators or the Holodeck again. The
ultimate in recycling.
And, er, if another real person in the Holodeck is the... recipient of
your, er, donation? The Holodeck doesn't interfere, and we have that
little charmer, Alexander, to prove it. (Thanks to Benjamin Chee for
pointing this one out.)
 
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