Understanding your lean body mass is important because the amount of lean body mass that you have determines your resting metabolic rate.

Your resting metabolic rate is the number of calories you burn at rest in 24 hours. The more lean body mass you have, the higher your resting metabolic rate. So what is lean body mass? Lean body mass is simply everything that’s not fat – so this component includes your bones, organs, muscles, ligaments, tendons and fluids.

Lean mass and fat mass are made up of two entirely different types of cells and tissues – which is why (even though people say this all the time) muscle can’t “turn into fat.” If you stop exercising your muscles, it might seem as if that’s happened; without resistance training to maintain your muscle mass, your muscles can become smaller, which can make the fat on the surface more apparent. But just as you can’t change a liver cell into a skin cell, you can’t change a muscle cell into a fat cell.

Every pound of lean body mass that you have burns about 14 calories per day or every kilogram of lean body mass that you have burns about 30 calories per day. When you’re talking about resting metabolic rate it’s more correct to say that it’s based on your lean body mass and not your muscle mass.

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