according to this link stpierre loses 15lbs in the week leading up to a fight

[shouldercharge]

George St Pierre On Cutting Weight Vince Chan

if he can do that at such a low body fat % is there any reason why someone at 12-14% body fat couldnt? or perhaps shouldnt?

[Steakeater]

Ive lost 22 pounds in 4-5 days, though I was bloated to begin with. Its water.

You can lose it by loading/dropping sodium, water, and dropping carbs. Keep protein, and reduce fiber.

[XTrainer]

This forum has a hundred legitimate discussions about weight cutting. This is not one of them

Cutting weight based on what "the guy on TV does" without knowing what you're doing is a very bad idea, both in terms of health and performance.