How much of a human is water?
Body water
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By weight, the average human adult male is approximately [1]60% water and the average adult female is approximately 55%. There can be considerable variation in body water percentage based on a number of factors like age, health, water intake, weight, and sex. In a large study of adults of all ages and both sexes, the adult human body averaged ~65% water. However, this varied substantially by age, sex, and adiposity (amount of fat in body composition). The figure for water fraction by weight in this sample was found to be 58 ±8% water for males and 48 ±6% for females.[2] The body water constitutes as much as 93% of the body weight of a newborn infant, whereas some obese people are as little as 15% water by weight.[3] This is due to how fat tissue does not retain water as well as lean tissue. These statistical averages will vary with factors such as type of population, age of people sampled, number of people sampled, and methodology. So there is not, and cannot be, a figure that is exactly the same for all people, for this or any other physiological measure.