Question

What is the average water percentage in the human body?

Answer 1

The water present in the body of an organism is the amount of water contained in the tissues, blood and bones of the organism. The water content in the several fluid storage spaces of an organism add up to the amount of total body water.

Complete answer:
Water by both weight and volume makes up a major portion of the human body matter. Regulation of the correct balance of water in the body of an organism is an important part of homeostasis.
An average adult human male is made up of about 60-$65\%$ water by weight and an average adult human female is made up of about 50-$55\%$ water by weight. Body water percentage varies due to various different factors like:
- Age
- Sex
- Water intake
- Health
- Weight
2/3rd of the body water is made up of intracellular fluid. It contributes to roughly about $62.5\%$ of the total body water. Extracellular fluid makes up to 1/3rd of the total body water. It amounts to roughly $37.5\%$ of the total body water. The extracellular fluid contains:
- Plasma
- Interstitial fluid
- Transcellular fluid

Note:
Body water in animals is mostly contained in the form of various bodily fluids.
Newborns are made up of as much as $75\%$ body water. Some obese people on the contrary are made up of as little as $45\%$ body water. Obese people have such low body water percentages due to the property of fat tissue being unable to retain water as well as tissues with little fat.