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Like the impressive rendition of ‘I Will Survive’ you belted out in the karaoke room, you can blame the alcohol.
As a diuretic drug, alcohol makes your body produce more urine, hence the urgent need to pee – a feeling that most people are all too familiar with.
But its effect on your bowels? Much more surprising and much, much more gross.
In his book, "What's Your Poo Telling You?", gastroenterologist Anish Sheth, M.D calls the most common type of bowel activity the "Day-After-Drinking-Stool" or the cute acronym 'D.A.D.S' for short.
Characterised by "its semi-solid state and accompanying stomach discomfort", the good news is it's a signal of your body purging itself of the toxins and damage done the night before.
So what's the reason behind its runny nature? According to Sheth, it's all down to the ethanol in alcohol, which has a stimulant effect on your bowel motility. (Post continues after gallery.)
"It basically revs up your intestines so that the contents move through more quickly," he says.
"This leaves less time for your colon to absorb water, and results in a profuse, watery stool."
There's a silver lining, however; Sheth believes you'll generally feel better after the second D.A.D.S.
"Occasionally, the large carbohydrate load in alcoholic beverages can overwhelm your digestive enzymes and indirectly cause diarrhoea," he says. Great.
Usually, our bodies produce enough enzymes to break down the complex carbs found in the drinks, but when you're drinking large amounts, which are subjected to the accelerated digestive process caused by the ethanol, they can actually enter the large intestine before they are broken down.
According to a 2000 study published on the National Centre for Biotechnology Information, even a small amount of alcohol can inhibit absorption of nutrients and fluids, and stimulate secretion of water and electrolytes. (Post continues after gallery.)