Water does more than just transport nutrients around the body, it also plays an active role in metabolic reactions.
Through a process called hydrolysis, water molecules are part of the biochemical breakdown of proteins, lipids and carbohydrates, which are structurally complex foods, into units more absorbable by the body.
Other metabolic reactions produce and release water molecules. This is generally referred to as “metabolic water” or “endogenous water.” The amount of water produced can change, depending on whether the reaction involves the oxidation of proteins, lipids, or carbohydrates.
An average adult body is capable of producing between 250-350 millimeters of “endogenous” water per day.