4:1

That's the ratio of the size of one pound of fat to one pound of muscle. We always tell our members that they may not see a loss of weight on the scale, but they will notice a difference in inches lost, the way their clothes fit, and how they look. This can be very frustrating to someone who is focused on scale weight, but what needs to be understood is that muscle is more dense than fat and weights more, but also takes up less space.

So while reading Lose Fat Forever by Derek and Don Alessi, I came across this example: One pound of muscle is 4 times smaller than one pound of fat or one pound of fat is the size of a clenched fist and one pound of muscle is the size of a silver dollar. 

Hope that helps to give you a better idea as to why scale weight is not as important as pounds of fat lost. Again if you lost 10 pounds of fat, but gained 10 pounds of muscle. You will not see any scale weight lost, but you will definitely look different because muscle is much more dense that fat.

Live Fit,

Josh