Dianag, I am not sure if this article answers your questions or not but I would caution against living only on a juice diet.
You can't get enough protein with out supplementing it and it would be very hard to get enough calories for adequate health. Juicing for a week to 10 day can be done. I know several people that have done it. Just understand a good portion of the weight loss will be muscle mass along with fat and water loss.
Healthy wishes, Wally Bishop C.N.C.
Yup - the loss of muscle is not good. Thanks for clearing that up Wally! :)