What Happens to the Gut When You Give Up Coffee for Two Weeks: Scientists Unveil an Unexpected Effect 0 13

Recently, more and more scientific studies have focused on the connection between the gut and the brain. Research shows that gut bacteria directly influence brain function, both healing and poisoning it. Moreover, these bacteria reach the brain not only by 'traveling' through the bloodstream but also directly, as if via an elevator, through the vagus nerve. It is important which specific bacteria enter the brain: beneficial or harmful.

One of the key factors influencing the composition of the gut microbiota is diet. Plant-based foods rich in fiber nourish beneficial bacteria, while sugar, alcohol, and ultra-processed products serve as food for the bad ones.

But what about coffee? Irish scientists from University College Cork decided to investigate how this beverage affects the composition of gut bacteria.

The researchers conducted an experiment involving 62 healthy volunteers. Half of them regularly consumed coffee, while the other half did not. However, there were no other significant differences in their diets, including alcohol consumption.

Next, coffee lovers were instructed to abstain from coffee for two weeks. Then, one group was told to drink decaffeinated coffee for 21 days, while the other group consumed caffeinated coffee.

The experiment showed that coffee lovers had a significantly different gut microbiota compared to those who did not drink coffee. In particular, they had a significantly higher number of Cryptobacterium and Eggerthella—anaerobic bacteria that participate in bile acid metabolism and help combat pathogenic microorganisms. Additionally, coffee lovers had more Firmicutes bacteria, which, as studies have shown, are associated with positive emotions in women.

"Although all functions of these bacteria are still unknown, our results suggest a positive impact of coffee on gut health," the study published in Nature Communications states.

According to the researchers, coffee may have a more complex effect on the body than previously thought. The beverage can alter the composition of gut microbiota, which in turn can indirectly affect metabolism, immunity, and emotional state. However, the scientists emphasize that further research is needed to draw definitive conclusions about the benefits or harms of coffee.