The Ultimate Cleanse?
I tried the master cleanse about 3 years back, but only for 4 days (due to some life circumstances) Those 4 days were actually quite helpful, and kickstarted my weightloss and physical activity.
I was fairly sedentary (though I walked to and from work every day, about 1 mile each way) and had some poor eating habits.
After the cleanse, I had more energy, and began going to the gym, and eventually went from (6'2") 230 pounds, to 198... I've slacked off on the gym slightly since then, but maintained most of the eating habits, and currently I'm 210... It's probably not for everyone, but I did find that it helped, even for such a short duration. The energy increase was the biggest benefit I found.

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