Check this extremely complicated version of how this happens.  Then a longer, slightly plainer explanation, then this more popular science version.  I can't really understand it all, anyone have a clue?  Could this be for real?

Why take any chances while we're waiting for the results to be verified by good old blogo-twitterverse examination?  Better safe, than sorry.  We will just have to deal with the euphoria and appetite enhancement.  Hehey.