Why can coffee act as a laxative?


Why can coffee act as a laxative?
Why can coffee act as a laxative?
Understanding the potential laxative effects of coffee.
© American Chemical Society (A Britannica Publishing Partner)
  • © American Chemical Society (A Britannica Publishing Partner)
    Understanding the potential laxative effects of coffee.
  • Encyclopædia Britannica, Inc.
    Learn about the difference between prokaryotes and eukaryotes.
  • © American Chemical Society (A Britannica Publishing Partner)
    Learn about the chemical process the human body uses to digest carbohydrates, proteins, and fats.
  • © American Chemical Society (A Britannica Publishing Partner)
    Learn about caffeine's effects on the human body.
  • A survey of the largest known single living organisms on Earth, which includes representatives from the animal, plant, and fungal kingdoms.
  • Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.com
    Most of the digestive process occurs in the small intestine, which channels water to the lymphatic system and nutrients to the circulatory system. The large intestine absorbs any remaining water.
  • Science in Seconds (www.scienceinseconds.com) (A Britannica Publishing Partner)
    The possible health benefits of coffee consumption.
  • Encyclopædia Britannica, Inc.
    The Iguaçu Falls supply hydroelectric power to Argentina, Brazil, and Paraguay.
  • Contunico © ZDF Studios GmbH, Mainz
    Learn why the human stomach rumbles.

Transcript

SPEAKER 1: A lot of you folks out there are coffee lovers. But aside from the buzz we get from a cup of Joe, there's often another noticeable side effect. Why on earth does coffee make us have to poop?

So it's widely understood that coffee has a laxative effect on some people. What's not so clear is why. For awhile people blamed caffeine, but the same effect can be had from decaf as well. Not to mention, people don't commonly have this sort of response to energy drinks or sodas. So what else is going on in a cup of Joe?

When you drink coffee, it's acidic nature has an effect on your stomach. Coffee causes the stomach to secrete a heightened level of gastric acid, a very acidic fluid that helps your body break down protein. Coffee also contains a compound called chlorogenic acid that increases stomach acid levels. This boost in acidity can cause the stomach to dump its content more quickly into the intestines. This could be one of many contributing factors.

It has been proven that coffee affects the movement of the large intestine within four minutes of ingestion, similar to the way a large meal does. There are nearly 1,000 different compounds found inside a cup of coffee. And while scientists can be certain that at least one of these is the culprit, they still aren't quite sure which triggers the digestive call to arms.

On the other hand, they do have a sense of what the mystery chemical or chemicals are actually doing once inside your guts. The body produces these two hormones to help digest food. The consumption of coffee, decaf or not, has been shown to increase the levels of these compounds produced in our bodies, enhancing their general effects.

Gastrin is a hormone that's released to help get the colon up and running at full speed. To do that, gastrin activates a process called peristalsis, the relaxation and contraction of muscles that happens in waves to help move waste to its final destination. Cholecystokinin also causes the release of digestive enzymes and bile, which help regulate the process of pooping. By the way, this pooping effect has been shown to only occur in about 3/10 of the population. So consider yourself special if you're one of those three. So, we've kind of got an answer, but like many things in the scientific world, we need more time and more science to get the story straight.