General questions about The Master Cleanse Diet...?

I am thinking of starting the Master Cleanse. I feel like for the past year I have totally neglected my health due to my hectic schedule. I want to do a detox, and get my body feeling better. I have heard great things about the Master Cleanse, but I have a couple concerns. First, I am about 5'5" and weigh 127. Will losing weight so quickly be safe for me? Second, I manage a retail store 7 days a week, and am on me feet for at least 9 hours each day. I am a little worried I might feel too weak or dizzy for work. Anyone with knowledge on this subject???

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