Weight loss during off week?

Hi!

I just finished stage one and really enjoyed it.  I was very consistent and lost a few pounds and definitely increased the amount of weight I could lift in every exercise.  Toward the end of stage one (last 2 weeks or so), I hit a plateau and could not seem to lose.

 I decided to take the book's advice and take one week off before starting stage 2.  Since the beginning of the week, I have already lost 4 lbs, which about doubles my total weight loss. 

Is this normal?  Can someone help me understand why this happened?  Does it have something to do with the muscles re-building?  Don't get me wrong, I am very happy - it just seems odd that the week during which I am NOT working out, I have lost the most weight.

Thanks for any info!

Congratulations on finishing stage 1!!  As for the sudden drop in weight, I would have to guess that it is water weight your muscles were hanging on to to help rebuild.  You may gain a couple of them back once you workout again.  The muscles like to hang on to extra water after a workout!

Enjoy your week off!