Water is an indispensable nutrient because it carries nutrients throughout the body, serves as the solvent for minerals, vitamins, amino acids, glucose, and other small molecules, cleanses the tissues and blood of wastes, actively participates in many chemical reactions, acts as a lubricant around joints, serves as a shock absorber inside the eyes, spinal cord, joints, and amniotic sac surrounding a fetus in the womb, and aids in maintaining the body's temperature