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Water cushions your organs, carries nutrients, and helps regulate your temperature — and it makes up more of you than anything else.
Roughly 60 percent of an adult human body is made up of water, though the exact proportion varies with age, sex, and body composition, since muscle tissue holds more water than fat does. Water plays several essential roles throughout the body, including cushioning organs and joints, transporting nutrients and waste, and helping regulate body temperature through processes like sweating.
Figures like 30 percent or 90 percent both miss the mark, 30 percent would be far too low for a body to function properly, while 90 percent would exceed even water-rich tissues, making 60 percent the well-established figure.
Water content actually tends to decline somewhat with age, infants are born with an even higher percentage of water in their bodies than adults, sometimes over 70 percent, which is part of why staying properly hydrated becomes an increasingly important health consideration later in life.
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