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FALSE:::::::: Up to 60 percent of the human body is water, the brain is composed of 70 percent water, and the lungs are nearly 90 percent water. About 83 percent of our blood is water, which helps digest our food, transport waste, and control body temperature. Each day humans must replace 2.4 litres of water, some through drinking and the rest taken by the body from the foods eaten.
Average: On average, adult humans have 57 to 60 % water by mass. The variability depends on muscle and body fat. More: The human body has a variable water content that châ¦anges daily and with age and gender and body type. On average, adult humans have 57 to 60 % water by mass. At birth, a baby can have up to 75% water weight and this decreases with age. Obese individuals can have as little as 45% water weight. Women tend to have a few percent less water weight than men, but this is largely a difference in muscle and body fat between individuals.