My sister did a detox course once (well, half of one) that she got from the chemist. She's been a vegetarian all her life, just doesn't like meat, but this detox must have been very low in some important nutrients becuase she started getting quite lethargic, hungry all the time and was CRAVING fish (which, along with any other protein was out of bounds) she had some anyway and quit the detox. Detoxes can be good, but you've got to watch them and listen to your body.
It sounds like your friend must have lost weight mainly through getting rid of all the built up toxins in her system. Eating crap can lead to all kinds of rubbish in your digestive system.
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"