I've given these things a try myself in the past so I'm not judging something I don't know about but everyone I know who has ever tried these diets has put all the weight back on fairly fast. More so than people who have lost weight with other diets.
I'm not considering it myself as I have a damaged kidney and wouldn't be allowed now but just wondering what the general consensus is. I still have a few of the pages "liked" on Facebook and the before and after pictures are amazing but does anyone actually keep the weight off?