What percentage of the human body is composed of water?

The percentage of the human body that is composed of water is approximately 60%. This value is a general estimate and can vary based on factors such as age, sex, and body composition. In young adult males, for instance, water constitutes about 60% of total body weight, while in females, it is slightly lower, typically around 55% due to a generally higher percentage of body fat.

Water plays a crucial role in many physiological processes, including thermoregulation, nutrient transport, and waste elimination. It also provides structure to cells and acts as a solvent for biochemical reactions. Understanding the significance of water in the human body emphasizes its essential role in maintaining homeostasis and supporting overall health.