What is body composition?

• A. The ratio of bone density to height
• B. The total body weight
• C. The amount of water in the body
• D. The proportion of lean body mass to fat mass

Answer: (D)

Body composition is about how much of your body is made up of lean tissue versus fat tissue. Lean body mass includes muscles, bones, organs, and body water, while fat mass is the stored fat your body carries. The important idea is the balance between these two components, not just how much you weigh overall. Two people can have similar weights but very different body compositions, which can affect health and performance. That’s why body composition is a more informative measure than total body weight alone. The amount of water in the body is part of lean mass, but it doesn’t by itself describe the proportion of fat to lean tissue, so it doesn’t capture the full concept.