Because milk tea is essentially an aqueous solution, the main component is water. A large amount of water is absorbed by the gastrointestinal tract into the blood and then into the kidneys, and the crystal osmotic pressure of plasma decreases when water increases, and the reabsorption of water by the kidneys is weakened, so urine increases. The concentration and dilution of urine actually depends on the renal tubules and collecting ducts, on the ratio of water and solute reabsorption in tubular fluid, and water reabsorption is relatively easy to change and therefore is its main aspect. Water reabsorption depends on two basic conditions: i. The osmotic concentration gradient inside and outside the renal tubules is the driving force for water reabsorption. Second, the permeability of the collecting duct to water. The concentration and dilution of urine depend on the osmotic gradient of the renal medulla and also on the permeability of the collecting ducts to water, the latter being mainly influenced by the concentration of vasopressin in the blood.