5 DAY MC CLEANSE - WITH WEEKEND OFF - START AGAIN ... NEED ADVISE

I just finished 6 days on the Master-Cleanse and ate on Sunday and I am back doing the Master-Cleanse today. I plan on going 5 days on the Master-Cleanse with very little food on Saturdays and Sundays(mainly raw foods). I want to mainly do this to get the bulk of my weight off (50lbs). Do you think this will be too hard on my body? Any ideas would be helpful.

I also have a friend who eats one meal a day and still drinks the lemonaid (6x).

Any ideas would be helpful.

Thanks and take care,
Kimberley