You will be much better off using a green superfood powder instead of a protein powder. The superfood will give you all the nutrition you need to keep away the haggard look (unless you are so thin you lack the body fat to look healthy and slim instead of starving.) If you supply the body with the plant based vitamins and minerals that are plentiful in the green drinks you will be healthier and stronger, although you will be cleansing at a much gentler rate. For an added boost, add the green powder to freshly juiced carrot, apple and Celery juice. Do this once or twice a day and then use the lemonade the rest of the time.

By the way using a green drink will also help people who want to or need to cleanse but are too weak or ill to do the Master-Cleanse "as is". It is not as powerful as the Master Cleanse, but it does wonders for someone with health problems who needs the healing of a fast, but with more nutrition to prevent dragging the body down further. You can always segue into a pure Master Cleanse when you feel like it.