Do you lose muscle mass faster than fat if you do not exercise?

Hi everyone!! Just a quick question...I have a friend who had lap RNY distal around the same time as me but she is not walking...at about a week after surgery I had lost 5 lbs more than she had at the time. I was trying not to be competitive, so I haven't told her how much weight I have lost, but she says she has lost already 28.5 lbs today, AND SHE IS NOT WALKING!! AND she doesn't follow the same eating as I do. I go exactly by the book. That helps me. I walk my two miles everyday even though it is my least favorite thing to do...I have also tried to stay active around the house while I am off work. She says she just reads and watches TV all day...so my ultimate question is..do you lose muscle mass quicker than you lose fat?

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