You may have seen these. Boots were doing a free go on their weighing machine. Big display of pills adjacent. Also lots of TV advertising featuring somewhat overweight woman jumping for joy. Loadsamoney to be made via these things clearly.
Basically the pills make you shit yourself. Oh and you might lose a little more weight than normal. By means of excreting oily shit. And they cost £55/month.
Some samples:
I Can't Believe I Just All Over Myself!
take alli? get ready for a shit fest!