Does Coffee Make You Poop? Here’s Why:

Your morning cup of coffee gives you your daily boost, but it may also send you on a beeline for the bathroom, both to pee and possibly to poop. Whether you experience the diuretic effect ,  or colon-stimulating effect  depends on your personal biochemistry and whether you’re a regular coffee-drinker or not. Here’s what scientists know…



A study published in the gastroenterology journal Gut verified some people experience colon stimulation within minutes of consuming a cup of coffee.

For those of you for whom coffee does make poop, how does it work?

Coffee promotes the release of the hormone gastrin, which stimulates the secretion of gastric juice and increases colonic motor activity. Activating the colon may stimulate peristalsis, leading to the purgative effect.


The caffeine in coffee is a stimulant. Generally, stimulants increase urine production. If coffee acts as a diuretic, drinking it will make you need to urinate more frequently, dehydrating you slightly. Dehydration can lead to constipation, which is the opposite of what some coffee drinkers experience.

BUT,  if coffee doesn’t act as a diuretic for you, you may be more susceptible to the laxative effect of the brew.

Another factor could be psychological since bodily functions tend to adapt to a daily pattern. Thus, if you always start your day with a cup of coffee and a bathroom break, your physiology may become accustomed to the routine.

However it works, scientists have verified coffee’s biochemical ability to send people to the toilet, just not necessarily for the same reason as each other.

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