Why is it that you urinate more when you drink caffeine?

Question

It seems like if I drank 12 ounces of caffeinated soda, I would urinate a lot faster, and more volume, than if I drank 12 ounces of water. Why? What is the mechanism for this?

Answer 1

Caffeine is a diuretic:
Diuretic Effect
Caffeine consumption has been proven to cause major changes occurring to the kidneys known as the diuretic effect. Caffeine increases the blood flow in the kidneys and at the same time inhibits the re-absorption of sodium and water. Also caffeine has been known to weaken the detrusor muscles in the bladder, which provokes the need to urinate.

Answer 2

One well-known side effect of caffeine is diuresis (secretion of urine). However, the available literature in this area does not support this concept. Two studies reported no changes in core temperature, sweat loss, or plasma volume during exercise following caffeine ingestion. Another study demonstrated that caffeine in a fluid replacement drink had no affect on urine volumes and body hydration status during exercise. Many will argue that coffee makes them urinate more often and they may be right, but it may be due to increased fluid intake rather than increased caffeine intake. Coffee with nothing added is 98% water, when someone consumes 2-3 cups they may be ingesting 0.5-0.75 litres of water in a short period of time. If the body is adequately hydrated, then this fluid must be eliminated to restore normal water balance, hence the increase in urine output.

Answer 3

Caffeine is a vasoconstrictor - it narrows the blood vessels, raises blood pressure somewhat, and thus forces more blood through your kidneys to be cleaned. More blood means more urine is created, so you urinate more.

Answer 4

caffine speeds up ur metabolism causing ur body to process the drink faster

Answer 5

diuretic