Your body is made up of two types of tissues-fat tissue and lean tissue. Your body composition is the percentage of fat tissue and lean tissue in your body. As you become physically fit, the ratio changes. The percentage of fat tissue decreases and the percentage of lean tissue increases.
The body uses fat tissue every day. Fat is used as the body stores and uses nutrients. Everyone has stored fat beneath the skin and around the internal organs. The number of fat cells a person has is determined at a very young age. Fat cells can become smaller, but they cannot be lost. Females have more stored fat in their bodies than males. The total percentage of body weight that is fat is usually 16 to 19 percent for males and 22 to 25 percent for females.
Muscles, bones, cartilage, connective tissue, nerves, skin, and international organs are lean tissue. The percentage of your body weight that is lean tissue varies. The amount of muscle and size of your bones are the factors that most greatly influence the percentage of your body that is lean tissue. As many people age, their level of physical activity decreases . By using less energy, muscle tissue decreases and a larger percentage of their body weight becomes fat.
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