Percentage water human body 90? 70? 53?

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The human body's water composition varies widely in reported percentages, with common figures ranging from 50% to 90%. A reference man weighing 70 kilograms (154 pounds) has approximately 60% of his body weight as water, equating to about 42 kilograms (92.4 pounds). Women typically have a lower percentage due to higher adipose tissue. Infants have a higher water composition, while elderly individuals have less. About two-thirds of the body's water is intracellular, with the remaining third divided into interstitial fluid (75%) and plasma (25%).
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Hi, every time I hear any website/TV program/person mention the percentage water composition of the human body it varies tremendously. 90,80,85,70,53. What is it? any help appreciated. Thanks
 
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My Human Physiology book says that the 70-kilogram (154 pounds) reference man has 60% of his total body weight in the form of water (42 kg or 92.4 pounds). For women, it's a bit less because women have more adipose tissue (fat). Infants have more and old people have less water.

About two thirds of the water is in the cells, and the remaining third is split between interstitial fluid (75%) and the (blood) plasma (25%).
 
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