Does Coffee Help The Digestive System? Understanding The Secret Link


Coffee is one of the most popular beverages worldwide, with over 2 billion cups consumed every day. Many people rely on their morning cup of coffee to help wake them up and get their day started. But what effect does coffee have on our digestive system? Coffee contains a number of compounds, including caffeine, antioxidants, and acids that can influence digestion in both positive and negative ways.

In this article, we’ll explore the benefits and downsides of coffee for the digestive system, examining its effects on gut motility, stomach acid, the gut microbiome, and more. We’ll also look at who may want to limit their coffee intake for digestive health. 

What Are The Benefits Of Coffee For The Digestive System?

Coffee And The Digestive System

Coffee has several attributes that can aid digestion and encourage regularity when consumed in moderation. Here are some of the key benefits of coffee for the digestive tract:

🔹 Stimulates Gastric Motility

Coffee can stimulate motor function in the gastrointestinal tract, encouraging movement and contractions that help push food through the digestive system. The caffeine in coffee is thought to have a prokinetic effect, which promotes gastric emptying and intestinal motility. This can help reduce bloating and constipation.

🔹 Promotes Gut Microbiome Diversity

Some research indicates that coffee may support healthy and diverse gut microbiota. Coffee contains prebiotic fibers and polyphenols that favor beneficial gut bacteria like bifidobacteria and lactobacilli. The gut microbiome plays many important roles in digestion and immunity.

🔹 Acts As A Laxative

Coffee has a laxative effect for many people due to the combination of caffeine and other compounds. Caffeine stimulates contractions in the colon, while chlorogenic acids and N-alkanoyl-5-hydroxytryptamides promote gastrocolic reflexes that can stimulate bowel movements. This makes coffee a helpful beverage when constipation is an issue.

🔹 Provides Antioxidants

Coffee is high in antioxidants, including polyphenols like chlorogenic acid. These compounds can help reduce inflammation in the gut and protect cells from oxidative damage. This may promote better overall digestive health.

Is Coffee Beneficial For The Gut Microbiome?

Some research does suggest that coffee may support a healthy and diverse microbiome thanks to its fiber, polyphenol content, and other compounds:

  • Studies indicate that coffee consumption is associated with a greater abundance of beneficial Bifidobacterium species like B. longum and B. adolescentis as well as higher microbial diversity. 
  • Coffee polyphenols like ferulic acid are metabolized by gut bacteria, creating compounds that have prebiotic and anti-inflammatory effects.

However, more research is still needed to fully understand coffee’s impact on the complex microbial ecosystem in the gut. The effect likely depends on the specific coffee bean composition, varietal, roasting method, and individual factors like diet and lifestyle habits.

Side Effects Of Coffee On The Digestive System

Despite its benefits, coffee does have some drawbacks and can cause issues for those with sensitive digestive systems:

  • Heartburn & Reflux: The caffeine and acids in coffee stimulate gastric acid production. This can aggravate acid reflux symptoms and heartburn.
  • Diarrhea & Loose Stools: Excess caffeine from coffee can overstimulate the gastrointestinal tract, provoking rapid bowel movements and loose stools. Those with irritable bowel syndrome (IBS) tend to be more susceptible.
  • Dysbiosis: There is some concern that the acids and compounds in coffee could alter gut flora balance, allowing harmful bacteria to proliferate. However, research overall doesn’t show significant dysbiosis.
  • Drug Interactions: The caffeine in coffee can decrease the absorption of certain medications, including thyroid medication, lithium, and certain antibiotics like Ciprofloxacin. 
  • Aggravates Ulcers: For those with gastric ulcers, coffee may increase stomach acid production and aggravate symptoms. Limiting intake may be recommended.


When consumed in moderation, coffee can provide some digestive benefits by stimulating motility, promoting regularity, and supporting gut microbiome diversity through its unique combination of compounds. However, coffee may aggravate reflux, IBS, and other digestive issues in those with sensitivities.

Most healthy adults should tolerate a cup or two of coffee per day without issues, but pay attention to any negative symptoms. Consult your doctor if coffee seems to significantly worsen digestive health. Overall, coffee’s impact depends on the individual, their medical conditions, and the specific coffee preparation.


Q: Is coffee acidic?

A: Yes, coffee is mildly acidic, with a pH of around 4.5-6.0. This acidity comes from compounds like chlorogenic acids, caffeic acid, and citric acid. The roasting process increases coffee’s acidity slightly. This acidity can aggravate heartburn or reflux in some individuals.

Q: Does coffee cause diarrhea? 

A: Coffee can cause diarrhea in some people due to the stimulant effects of caffeine on the gastrointestinal system. Caffeine increases gastric acid secretion and accelerates intestinal motility, which can result in loose stools or diarrhea, especially in those with IBS. Limiting coffee intake may help. 

Q: Is coffee good for constipation?

A: Yes, the caffeine in coffee can stimulate contractions in the colon which can help alleviate constipation. Coffee also promotes gastrocolic reflexes which signal the urge to have a bowel movement. The chlorogenic acids in coffee also have a laxative effect. So a cup of coffee can often help relieve mild constipation.

Q: Does coffee damage your gut?

A: In most healthy people, moderate coffee consumption is not damaging to the gut. However, the acidity and caffeine in coffee may aggravate conditions like reflux, ulcers, IBS, or Crohn’s disease. Those with chronic digestive issues may find limiting coffee improves symptoms. Overall, a cup or two per day as part of a healthy diet does not appear to significantly disrupt the gut.

Dr. Jun Ren is a dedicated and experienced registered dietitian and nutritionist who is committed to helping people achieve their health goals through personalized nutrition plans. With a passion for promoting healthy eating habits and preventing chronic diseases, Dr. Ren has been able to assist numerous clients in improving their overall quality of life.

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