Read this book "Ultra metabolism" By Mark Hyman
And "In Defense of food" By Micheal Pollan is a very good one too
So yea you do not lose muscle or fat, you just lose water. However you
can lose muscle if you do not use it same with your brain it is called muscle atrophy.
Atrophy is just a fancy medical term for loss. So use it or lose it.
But the ultra metabolism book will tell you most everything about how to
lose weight the right way and in defense of food does too. In defense
of food is more fun to read but they both have real good info.
Don't drink your milk is a good book too
is a sham! They make a claim that this magical berry has so much power
with weight loss because people want the one stop chop shop easy fix. It
does not work because there is no wholeness. We crave fats and sugars
because at one time before industrialization it was hard to find fats
and sugars and carbohydrates. Now our bodies have a lot of the 3 rare
nutrients our bodies need to evolve to crave vegetables and plants
because do you eat at least half of every meal to contain plants. what
ever I am rambling. The point is no low fat, acai berry, pill, meat diet
will work you need so much more structure than just to cut one thing
out. Read the books you will learn.