Why Coffee Makes You Poop? The Science Behind Coffee's Laxative Effect

Coffee stimulates the production of gastrin and cholecystokinin (CCK) hormones, essential for digestive function
Coffee's stimulating effects extend beyond boosting energy levels. (Representational Image: Wikimedia Commons)
Coffee's stimulating effects extend beyond boosting energy levels. (Representational Image: Wikimedia Commons)
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"Coffee Fueled and Ready? Let's Dive in and explore a topic that will have you buzzing in just a few minutes!"

Ever wonder why your morning coffee ritual inevitably leads to a bathroom break? You're not alone. The coffee-bathroom connection: it's real. Research reveals that coffee triggers bowel movements due to its impact on gut hormones and colon activity. And here's the surprise: decaf coffee can have the same effect. Research reveals caffeine boosts colon activity by 60% compared to water and 23% more than decaf coffee.

The Science Behind Coffee's Laxative Effect:

Coffee's stimulating effects extend beyond boosting energy levels. Caffeine, a key component of coffee, also triggers contractions in the colon and intestinal muscles, which are responsible for moving food through the digestive system, and it helps to facilitate a smoother and more efficient elimination process. As a natural stimulant, caffeine keeps you alert and focused.  A standard brewed cup contains roughly 95 milligrams of caffeine. [1]

Studies shows that coffee consumption can cause increased muscle contractions observed in colon within a mere 4 minutes, often culminating in a sudden urge to defecate.

Coffee's impact on bowels varies from person to person, but studies reveal that at least one-third of people experience an urgent bathroom trip after sipping coffee. And, women seem to be more sensitive to this effect than men.

Research on coffee's laxative properties has yielded conflicting outcomes. While some studies demonstrate a significant effect, others fail to replicate these results. These studies typically involve small participant groups.

Dr. Tania Elliott, Physician Executive and Influencer from New York city, addressed about why does coffee make you poop? on Instagram under the username @drtaniaelliott. Dr. Tania explains how coffee affects gut health and shares practical tips to break the cycle.

Dr. Tania said that both caffeinated and decaffeinated coffee can cause an individual to go to the bathroom but we know it’s not from the caffeine.

Coffee stimulates the release of a chemical named gastrin in our bodies, which is responsible for the contraction of muscles in our intestine (peristalsis), that causes us to go to the bathroom.
Dr. Tania Elliott, MD, Jefferson Medical College, Pennsylvania, USA

Is it bad for you to drink coffee in the morning to make yourself go?

Dr. Tania’s answer to that is no, as she says you shouldn’t rely on drinking coffee every day to help your bowel movements be regular. Instead, make sure you stay hydrated, make sure you’re moving and having regular exercise, and having a lot of fiber.

Unlocking Coffee's Influence on Gut Hormones:

Coffee stimulates the production of gastrin and cholecystokinin (CCK) hormones, essential for digestive function. The gastrocolic reflex, triggered by these hormones, stimulates gut contractions, facilitating the movement of waste through the colon and rectum, ultimately prompting defecation. [2]

Despite promising findings, the current evidence base is limited by small sample sizes. For instance, a European Journal of Gastroenterology and Hepatology study involving just 12 participants explored coffee's impact on gut hormones. Another study with six participants found that post-meal coffee consumption accelerated stomach emptying, potentially triggering bowel movements. A review in the World Journal of Gastroenterology noted that caffeinated coffee may stimulate acid production in the stomach and colonic movements in certain individuals. [3]

For years, caffeine was thought to be the primary driver behind coffee's laxative effects. However, recent studies have revealed that decaf coffee can also stimulate bowel movements, suggesting that other compounds are at play. Research has identified chlorogenic acids and N-alkanoyl-5-hydroxytryptamides as key players in this process. These compounds have been shown to stimulate the production of stomach acid, which helps break down food and facilitate its rapid passage through the gut. This discovery challenges the long-held assumption that caffeine alone is responsible for coffee's gastrointestinal effects, highlighting the complex interplay of coffee's various constituents.

While coffee's effect on gut hormones is well-known, more research is needed to unravel the complex ways coffee compounds interact with our digestive system. [1]

A 2016 study confirmed that coffee can worsen IBS symptoms in some people, although the exact properties responsible remain unknown. (Representational Image: Wikimedia Commons)
A 2016 study confirmed that coffee can worsen IBS symptoms in some people, although the exact properties responsible remain unknown. (Representational Image: Wikimedia Commons)

Uncovering the Dairy-Bowel Connection:

Milk and cream contain lactose, a sugar that can induce gastrointestinal disturbances in approximately 65% of individuals. Lactose intolerance can lead to rapid onset of diarrhea and gastrointestinal issues such as bloating, cramps, gas, nausea in abdomen within 30 minutes of consumption.

The severity of lactose intolerance symptoms tends to increase with age, and some individuals may not exhibit symptoms until adulthood.

Moreover, other coffee additives, such as sugar substitutes like Splenda (sucralose), can precipitate gastrointestinal disturbances, including diarrhea, bloating, and gas, particularly when consumed in excessive amounts. [4]

Uncovering Sensitivity in Irritable Bowel Syndrome (IBS) Sufferers:

For many individuals with irritable bowel syndrome, specific foods can exacerbate symptoms. Coffee, in particular, has been identified as a potential trigger.

A 2016 study confirmed that coffee can worsen IBS symptoms in some people, although the exact properties responsible remain unknown. A separate 2015 study explored the perceived effects of coffee on inflammatory bowel disease (IBD).

Among 442 participants: 73% regularly consumed coffee, 62% of non-coffee drinkers believed coffee worsened intestinal symptoms and Some coffee drinkers also reported worsening symptoms, despite continued consumption. [3]

Summary:

The notion that coffee triggers bowel movements is a common anecdote, but scientific evidence supporting this claim is lacking. In fact, individual responses to coffee vary greatly, with some people experiencing no gastrointestinal effects. To clarify coffee's true impact, additional research is needed to confirm whether coffee stimulates bowel movements and identify specific coffee compounds driving laxative effects.

References:

  1. Kubala, Jillian. "Why Does Coffee Make You Poop?" Healthline. Accessed November 15, 2024. https://www.healthline.com/nutrition/why-does-coffee-make-you-poop#TOC_TITLE_HDR_2.

  2. “Why Does Coffee Make You Poop?” Health. Accessed November 15, 2024. https://www.health.com/condition/digestive-health/why-does-coffee-make-you-poop.

  3. Leamy, Elizabeth. "Why Does Coffee Make You Poop?" Medical News Today. Accessed November 15, 2024. https://www.medicalnewstoday.com/articles/326537#decaf-coffee.

  4. “Why Does Coffee Make You Poop?” Cleveland Clinic Health Essentials. Accessed November 15, 2024. https://health.clevelandclinic.org/why-does-coffee-make-you-poop.

By Sai Sindhuja K

MSM

Coffee's stimulating effects extend beyond boosting energy levels. (Representational Image: Wikimedia Commons)
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