50% water is closer to the truth than 30%, but it still underrepresents the actual average for most healthy adults. While the water percentage can dip slightly below 60% in older adults or individuals with higher body fat percentages (since fat tissue holds less water than muscle), the general average remains around 60%. Hydration is more than just drinking fluids — water is involved in every cellular, digestive, circulatory, and neurological process. For example, your blood is over 90% water, and your kidneys rely on water to flush out toxins. Assuming that the body is only 50% water might result in undervaluing the importance of daily hydration. To function optimally, the body needs a consistent intake of water from fluids and foods. Though 50% is a better guess than 30%, it’s still not the correct average — 60% is the true answer for most healthy adults.