"Keep taking your drugs during the MC" (Have you watched his short video?)
The overlying theme promoted by the founder is -- Use the Master-Cleanse to lose weight.
I get the newsletters from that website and stories are posted about how much so and so lost from doing a MC. No follow ups are posted regarding how much is gained back.
Most people gain it all back, and some more if fundamental changes don't occur.
This in not mentioned leaving one to assume that all one has to do is a Master-Cleanse to lose weight.
I find it safer to get the straight dope from this here forum.