This goes for coffee but also some brands of ice tea – so it can’t be the caffeine or…? Please eli5!
In: Biology
Because drinks like coffee, cold drinks are diuretic and reduces the production of a hormone called vasopressin, which tells your kidneys to reabsorb water rather than flush it out through the bladder. With the body’s natural signal switched off, the bladder is free to fill up with fluid.
Without going into too much detail, your kidneys filter substances and water out of blood and return what is needed into blood. The less water they return to the blood, the higher the volume of water that goes to the bladder, which gives you the sensation that you need to urinate. Caffeine (amongst other substances) causes less water to be reabsorbed into the blood, so more goes to the bladder.
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