Caffeine is a stimulant that triggers several changes in the body. It is consumed by many people as a means of improving alertness and energy. But caffeine can also affect the gastrointestinal system, and not necessarily in ways you would like. It can increase the desire to go to the bathroom and even change the composition of your stool.
Caffeine Function
Caffeine stimulates the central nervous system and other bodily functions, such as metabolism. In moderate amounts, caffeine is considered safe for most people, but when the body gets overstimulated, it can cause anxiousness, restlessness and even changes to your heartbeat.
Changes in Stool
Stool may soften and become more moist if caffeine's laxative effects take hold. It should become easier to pass as well. However, MayoClinic.com reports that caffeine only serves as a laxative when taken in large doses of 500 to 600 mg -- the equivalent to five to seven cups of coffee. In extreme circumstances, you may notice bloody or black stool -- this usually results from an excessively high dose of caffeine. Although changes in stool are not necessarily dangerous, contact a health care professional to make sure you take proper action to correct the problem.
High Doses
High doses of caffeine can cause you to develop diarrhea. In most cases, this is temporary and will subside as the caffeine's effects wear away, but until then your stool may be runny and watery. This also worsens caffeine's dehydrating effect on the body -- because caffeine is a laxative, it can increase the body water content lost during the day. This can be dangerous if you have consumed more caffeine than is found in four cups of coffee. Counteract this effect by drinking water to hydrate yourself.
Foods to Consider
Caffeine is present in many foods and beverages, and being mindful of the amount of caffeine you are consuming can help you avoid unwanted effects that develop in your stool. Foods featuring caffeine include coffee, soft drinks, tea and chocolate. Coffee itself can have more than 100 mg caffeine in a single cup, making it a drink to avoid if you are concerned about the effects of caffeine on your body.
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