Questions for Chrisb1

To all who post here....Since Chrisb1 has made himself available to us, I thought I'd start a new Thread of questions for him.
I'll open things up by asking the first questions.....
Chrisb1....I'm about to begin a long Water Fast. I'd like to know how the Body consumes old Cells and replaces them with new. Also, I have a major concern about refeeding after the Fast is terminated. Do you think a combination of Celery Juice and Wheatgrass Juice would be too concentrated in nutrients for ending the Fast? I plan to make Green Juice a major part of my diet between fasts.
Thank you.....Wheatgrass Yogi