HopefulTricia -
I have also been concerned about the wisdom of so few calories for a long period of time, or ketosis for a long period of time. Please let us know what you find out, since you apparently are working with a doctor. Many of us are not. Just knowing my doctor, though, my guess is that she would say "moderation is better in everything". I have not read Dr. Chanh's book, but I am so glad you brought up this point. I think it needs investigating. As most of you, I am just so eager to lose pounds, that I am ready to try anything!
I am not dissing this diet at all, my first weigh in was great, and made the week worth it. Just trying to be careful of my health.
I have not heard any other concerns about this at all on this chat, so maybe I'm concerned over nothing.
Good for you for your weight loss!!!