There have been a few threads on this already... I will kick back in though.
I did the juice diet for a month and a half, the first month of which was completely juice... I lost 53 lbs, and it stayed off for a very long time, almost a year without gaining a pound. Those who think it is unhealthy, don't have their information correct. I was more healthy by a long shot while juicing. As long as you have fat on ya to take care of your energy needs, you will be perfectly fine. As a matter of fact, juicing is so damn good at healing people, that the government made it illegal for a medical doctor to prescribe it to you as a treatment. If you need a juicer, I have an extra "Jack Lalans" or whatever in the hell it's called that you can have. We got one from Walmart that has worked like a charm, and cost $70 (works a hell of a lot better than the $250 Jack whatever one). Juicing provides your body with absolutely everything your body needs to work, and then some, except the calories, which if you have extra weight, your body provides. There have been numerous studies and tests done on this, and if you do it right, you will be far more healthy. My wife and I originally did this because she was seeking a cure for her chronic hives (moms a doctor that tried everything and nothing worked for a year and a half), she found the movie "Fat Sick & Nearly Dead", and we decided to go for it for her sake. A week into it, she had no hives, and hasn't for almost a year. It also got rid of her heart palpitations. She did the diet for three weeks hard core, and continued with 50/50 with salads for another month, and still juices every now and then for the hell of it. I had skin cancer, now I don't. My uncle had colon cancer, now he doesn't. I can go on and on of just my family in the last year that this has helped. In doing this though, you will encounter those that have no clue as to what they're talking about, and will run their mouth's though, just wade through the crap, and you will be fine... If you have any questions, just PM me.
Now, I wouldn't spout any of this out, if I haven't done it, and seen what "juicing" can actually do with my own eyes. Also, as a disclaimer, I'm not a vegetarian by any means (the wife is now though), Taco Bell is my favorite place in the world! K.......
For those of you that want more info, you can watch a decent movie on it called Fat Sick & Nearly Dead.
You can also watch a movie called "The Gerson Miracle" that is long, and full of information, but really boring... Here:
http://topdocumentaryfilms.com/gerson-miracle/