About 7 yrs ago...I was severely depressed and stopped eating...I mean I still smoked and had my coffee ..maybe a lil water...but that was about it.....i went from 138 pds to 113 pds in one month....I lost alot of muscle. How do i know this?? It hurt to sit down...there was no padding on my butt...Just an exposed tail bone that would get bruised ..sitting in a driver's seat of a car...which we all know is fairly well padded..especially the american cars...... Now ..when i did 13 days of the master cleanse..I started at 129 pds...and ended at 115 pds.....Now the interesting thing was I was worried that this problem would arise again..but it did not. I was able to sit down without FEAR of bruising my tail bone...so OBVIOUSLY I didnt lose muscle that I needed.