What percentage of the human body is composed of water?

The correct answer is based on various scientific studies that indicate that approximately 60% to 65% of the human body is composed of water, depending on several factors such as age, sex, and body composition. For adults, the commonly accepted average is around 65%.

Water plays a critical role in many bodily functions, including regulating temperature, transporting nutrients, and facilitating chemical reactions. The percentage of water can vary, particularly in infants, who may have a higher percentage due to their body composition, while older adults may have a lower percentage due to changes in body fat and muscle mass.

This foundational knowledge about the human body's composition is essential for understanding hydration and its impact on health.