Celebrities such as Beyonce Knowles have become recent converts to the Madal Bal syrup diet, a "natural remedy" that consists of replacing meals with a liquid made up of the syrup, lemon juice, water and cayenne pepper; believers claim it purifies the body.
This one's been around for awhile, interesting that the comments Beyonce made about it class as a 'celebrity endorsement', but there you go.
I've known a couple folks who did this one in order to 'purge toxins', but it was just a process of fasting and feeling lighter as a result.