Coffee Linked to Gut Activity and Microbiome Changes
- A University of Copenhagen study links regular coffee drinking to digestive changes.
- The study involved 61 healthy adults in Denmark.
- Researchers used a small electronic capsule to monitor the digestive tract.
- Regular coffee drinkers showed greater gut bacteria diversity.
- This group also had lower acidity levels in the small intestine.
- Higher coffee intake was linked to more colon contractions.
- The study cannot prove that coffee directly causes these changes.
Regular coffee consumption may influence digestive system activity. This includes bowel movements and colon contractions. It is also associated with greater diversity in gut bacteria. That is the conclusion of a study by the University of Copenhagen.
The research was published in the journal Gut Microbiology. It examined the relationship between habitual coffee consumption and physiological changes in the digestive system.
How Does Coffee Affect the Digestive System?
The research team used a small electronic capsule swallowed by participants. The capsule monitored changes as it travelled through the digestive tract. It measured several indicators at once.
| Indicator | What It Measures |
|---|---|
| Transit time | Time required for contents to pass through the tract |
| Temperature | Heat of the digestive environment |
| Acidity | Acid level across digestive sections |
| Contractions | Muscular intestinal movement |
The study involved 61 healthy adults in Denmark. Participants were divided into two groups according to their coffee habits. The first group drank between one and five cups a day. They did so on more than three of the eight days covered by the study. The second group drank coffee less frequently.
Greater Diversity in Gut Bacteria
Results showed that regular coffee drinkers had greater diversity in gut microorganisms. This is consistent with previous research suggesting coffee may influence the gut microbiome. The microbiome is the community of bacteria and other microorganisms living in the digestive system.
Francesca Bucci, the study’s lead researcher and a PhD student in the Department of Nutrition, Exercise and Sports at the University of Copenhagen, said regular coffee consumption appeared to affect intestinal physiology.
Lower Acidity and More Contractions
One of the most notable findings was significantly lower acidity in the small intestine. This appeared among regular coffee drinkers compared with less frequent drinkers. Researchers also observed a link between higher coffee consumption and more colon contractions. These muscle movements help move intestinal contents through the digestive system.
Colon contractions play an important role in digestion and regular bowel movements. They help move waste through the intestines. They are also involved in maintaining normal intestinal function. Bucci said these contractions could support digestion and help reduce constipation. She added that they may maintain the functional condition of intestinal muscles.
However, the researchers said they could not yet determine whether lower small intestine acidity is beneficial or potentially negative for health.
Does Coffee Cause These Changes?
The researchers stressed that the study cannot establish that coffee directly causes the observed changes. However, Henrik Munch Roager, associate professor and head of the research group in the same department, said there are reasons to believe coffee plays a role.
Previous studies have shown that coffee influences several digestive processes. These include the secretion of stomach acids. According to Roager, this evidence suggests the observed differences may be associated with coffee’s effects rather than coincidence. He also pointed out that many people notice digestive changes after drinking coffee.
Further Research Needed
The researchers said the next step is a controlled study. In such a study, participants are assigned specific amounts of coffee to drink. The current research observed existing habits and compared results. A controlled study would allow researchers to investigate whether coffee itself is responsible for the changes.
It could also help explain the mechanisms through which coffee may influence bowel movements, intestinal contractions and the composition of the gut microbiome.
