Why does coffee have a laxative effect?

Contrary to popular belief, the laxative nature of coffee does not come from caffeine (this only affects people who are particularly sensitive to it). On the other hand, the acid in the coffee can trigger an intestinal reaction in the stomach, which makes it prone to discharge its contents into the intestines. The acidic nature of coffee also causes an increase in the production of bile acids in the body.

The same coffee (regardless if it is normal or decaffeinated) produces stimulating effects on the intestines.

Coffee also causes an increase in hormones that stimulate the large intestine. Coffee stimulates muscle contractions in the large intestine, which are similar to the contractions that occur after eating a meal. Scientists are still not sure what specific coffee compounds are involved.

Beyond the coffee beans themselves, also sweeteners, dairy products or non-dairy additives can also cause this laxative effect.

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