Lean Body Weight Assessment

The muscles, bones, ligaments and tendons, tissues, and water of the body make up lean body weight. Conversely, the amount of fat in the body is the fat body weight. Muscle tissue is 18% to 20% denser than fat. A liter (L) of muscle weighs about 1.06 kilograms (kg), whereas 1 L of fat weighs about 0.9 kg.

People may of course look very different even though they have the same height and weight. While one may look soft and “pudgy,” another may be thin and muscular. Thus, body composition cannot be determined accurately simply by standing on the scale and measuring one's weight. ...