What percentage of water does an average adult human body contain?

An average adult human body contains about 55% to 65% water, making this range the most accurate representation. Water is essential for various bodily functions, including maintaining temperature, transporting nutrients, and facilitating chemical reactions. The specific percentage can vary based on factors like age, sex, and body composition; for instance, younger individuals and those with more muscle mass generally have a higher percentage of water. While it may differ for individuals, this range serves as a standard reference point for the average adult, reflecting a fundamental aspect of human biology. This understanding is critical for health and fitness, as adequate hydration is vital for optimal bodily function.