I have tried the Master-Cleanse twice, 1st time 7 days 2nd time 10 days and never lost any weight. For me the Master-Cleanse is too high in Sugar even if I cut the maple down to the minimum each day. If I water fast I lose very quickly but as soon as I add Sugar in any form the weight loss stops. It is the same with juice fasting, if I do the high sugar juices I don't lose weight (carrot, beet, fruit) but if i do green juices I lose although I can't stand the taste of green juices so I don't do it. This may not be your problem but may be worth looking into.