Regular coffee drinking appears to change how your gut works

A recent study from the University of Copenhagen reveals that regular coffee consumption may alter both the gut bacteria and the physiology of the digestive system. To investigate this, researchers asked Danish participants to wear a small electronic capsule that tracked gastrointestinal transit time, temperature, pH levels, and intestinal contractions. The participants were divided into frequent coffee drinkers (consuming 1-5 cups daily on more than three days) and those who drank coffee less frequently.

The study confirmed that coffee does indeed impact the composition of gut bacteria. Frequent coffee drinkers exhibited greater diversity of microorganisms in their gut compared to those who drank coffee less often. However, the more intriguing finding was that frequent coffee consumption appeared to influence the gut's physiology itself. Frequent coffee drinkers had a lower pH in the small intestine and experienced more contractions in the colon.

While it's clear that moderate coffee consumption is linked to a reduced risk of cardiovascular disease, diabetes, depression, and various cancers, the research sheds light on the relationship between habitual coffee consumption and gut-related conditions. The study found that higher coffee consumption correlated with more gut contractions, which could support healthy digestion and help prevent constipation. However, the beneficial or harmful effects of the lower pH in the small intestine remain unclear.

The researchers stress that their study doesn't definitively establish whether the observed differences are solely due to coffee consumption. Nonetheless, senior author Henrik Munch Roager believes there is strong evidence to suggest coffee plays a significant role. Roager points out that prior studies have already established coffee's influence on various digestive processes, such as stomach acid secretion.

Given that many people report coffee affecting their digestion, Roager suggests that further intervention studies controlling coffee intake could provide valuable insights into how coffee impacts gut physiology.

The ultimate goal is to address the widespread issue of constipation and irregular bowel movements. By understanding how coffee affects digestion and intestinal contractions, researchers hope to develop natural ways to stimulate gut motility, which could be highly beneficial for many individuals. The study appears in Gut Microbiology.