text: Body composition can also be expressed in terms of various types of material, such as:
  *Muscle
  *Fat
  *Bone and teeth
  *Nervous tissue (brain and nerves)
  *Hormones
  *Connective tissue
  *Body fluids (blood, lymph, urine)
  *Contents of digestive tract, including intestinal gas
  *Air in lungs
  *Epithelium