Sanjay Gupta was interviewing Jillian Michaels last w/e on House Call and she was saying that under the controlled circumstances and constant supervision of the show (what we in science call "in vitro") the people lose a lot of weight a lot faster than would be likely or wise in the real world. ETA In other words: don't try this @ home. Here's the link to the transcript:
http://transcripts.cnn.com/TRANSCRIP...3/hcsg.01.html