The Muscle Mass Factor
It’s typical for a person to be burning somewhere between 1200 and 1700 calories per day just because of the energy that it takes to maintain your body’s normal functioning.
One of the primary determinants of that is how much lean tissue you have in your body, and the largest lean tissue that most people have is muscle. Researchers at Purdue University say you even burn calories while you nap. In fact, your body burns about 10 to 15 calories an hour for every pound of muscle you have in your body.