What percentage of the human body is made up of water?

The correct percentage of water in the human body generally falls between 50% and 70%. This range reflects the varying amounts of water based on factors such as age, sex, and body composition. For example, infants typically have a higher percentage of water in their bodies, around 75-80%, while the percentage decreases with age. Adult males tend to have a higher water content compared to adult females due to differences in fat composition, as water content is higher in lean tissue than in fat tissue. Consequently, understanding this percentage is crucial for appreciating how hydration impacts bodily functions, including temperature regulation, nutrient transport, and waste elimination.