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Does Caffeine Cause Diarrhea?

by
author image William McCoy
Toronto-based journalist William McCoy has been writing since 1997, specializing in topics such as sports, nutrition and health. He serves as the Studio's sports and recreation section expert. McCoy is a journalism graduate of Ryerson University.
Does Caffeine Cause Diarrhea?
A cup of black coffee. Photo Credit somchaij/iStock/Getty Images

Drinking a cup of coffee won't likely force you to sprint to the bathroom, but too many cups in one day might give your stomach a gurgling feeling that indicates diarrhea is on its way. The caffeine in your coffee has a laxative effect on your body, and one of the side effects of excessive caffeine consumption is diarrhea.

Excess Caffeine Can Be Problematic

Caffeine affects everyone differently, but moderate consumption of caffeinated products such as coffee and soft drinks isn't likely to give you diarrhea. The University of Michigan Health Service notes that 1,000 or more milligrams of caffeine, which you might consume in ten 6-ounce cups of coffee, can affect your bowels. A 2009 article in the "International Foundation for Functional Gastrointestinal Disorders," however, warns that just 2 to 3 cups of coffee can lead to diarrhea.

Caffeine's Effect on Your System

The caffeine you consume is instrumental in contributing to peristalsis, which is the process that moves food through your digestive system. Caffeine stimulates the muscles in your colon to alternately contract and then relax, which results in an increased need to move your bowels. Caffeinated coffee stimulates this part of your body more noticeably than decaffeinated coffee or water.

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Cream and Sugar Can Play a Role

If you add sugar and milk or cream to your cup of coffee, the drink might have a more pronounced effect on your need to use the bathroom in a hurry. If you have lactose intolerance, even without knowing it, the lactose in the dairy product can cause diarrhea. Similarly, many people can experience diarrhea as a result of consuming sugar or even artificial sweeteners such as sorbitol.

Lessen the Risk of Dehydration

If caffeine consumption leads to diarrhea, the simplest approach is to reduce your caffeine intake, and see if the condition subsides. It's safer to reduce your caffeine intake than cease it altogether, however, as sudden caffeine withdrawal can lead to a variety of side effects. When you have diarrhea, ensure you drink water frequently to reduce the risk of dehydration. Visit your doctor if the diarrhea persists for two or more days, you experience a high fever or you notice blood in your stool.

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