caffeine irritates the bladder, inducing urination (often urgently). But the total amount of liquid expelled after drinking coffee is not higher than after drin

caffeine irritates the bladder, inducing urination (often urgently). But the total amount of liquid expelled after drinking coffee is not higher than after drinking an equivalent amount of water. In this sense it is not a diuretic and does not dehydrate you. Separately, enzymes in the coffee bean (not caffeine) also act as a peristaltic.