Master Cleanse is good for losing weight. You can also do a fast with pure water. See fasting page on this site for more on this. After I did SWF (Salt-Water-Flush) I felt sick and I had not fasted.
Now I know people should never do it. See site below under anti-water. The reason the body does not digest it, but gets rid of it is because it is TOXIC. If you did digest it, it could kill you. Put a carrot in salt water and it will shrivel up in less than a day. Note-- this stuff on anti-water can help you lose weight also. Has quotes from CA governor. Pour a little salt on a slug and it dies.