I have been working a very labor intensive job for about 3 months now and have lost enough inches on my waist to go down two pants sizes yet my total weight when I go on the scale remains around the same. How is it possible that I lost 4 or 5 inches off my waist yet the scale doesn’t change? Is it possible what weight in fat I am loosing is made up for with an increase in muscle mass?
Yes.
Muscle mass is significantly heavier per unit of volume than fat is. Around 15-20% heavier. Muscles also fill in around the bones first instead of on the surface of the skin like subcutaneous fat.