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What is it in coffee which makes a person need to use the bathroom?

For many, coffee triggers the need to have a bowel movement. Is this because it is an irritant, or does caffeine aggravate the intestines or is it something else?

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CJ Kelly (lions44) says

19 months ago
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    Mary Wickison (Blond Logic) 19 months ago

    That sounds logical, it seems to affect quite a few people. Thanks for your answer.