In my experience (and yes, I have used the master cleanse), it helped me through changing my eating patterns. Before the cleanse I had a sincerely hard time refraining from eating junk food and additives. The cleanse was a great way to "break" the cycle. After the cleanse I had no problem refraining from such foods. It literally broke my bad food addictions.

Fasting has been done around the world for hundreds of years for various reasons including mental, physical and spiritual. As far as a "reset" goes it works fantastically. You will lose weight, but some will be water weight and will come back as soon as the cleanse is over. In addition, I would only go for a maximum of ten days, but I for one, am a fan of the cleanse… In fact, it also helped me to quick smoking which previously I was never able to do.

Good luck to you.