Study Links Coffee Consumption to Changes in Gut Bacteria

A recent study has identified a significant association between coffee consumption and the presence of certain gut bacteria, according to a multi-cohort analysis conducted in the United States and the United Kingdom. The research, involving 22,867 participants and integrating 54,198 public samples, found that coffee consumption is linked to the abundance of the gut bacterium Lawsonibacter asaccharolyticus ^[1][2].

In vitro experiments further demonstrated that coffee can stimulate the growth of Lawsonibacter asaccharolyticus. Plasma metabolomics identified metabolites such as quinic acid, which are associated with both coffee consumption and the presence of this bacterium ^[1][2].

Another controlled study conducted by APC Microbiome Ireland at University College Cork involved 62 healthy adults, split evenly between coffee drinkers and non-drinkers. Participants underwent a period of coffee abstinence followed by the randomized reintroduction of either caffeinated or decaffeinated coffee ^[3][4].

This study found that coffee drinkers exhibited increased levels of specific gut bacteria, including Cryptobacterium curtum, Eggertella species, and Firmicutes bacterium, compared to non-coffee drinkers ^[4][5]. Participants also reported lower levels of perceived stress, depression, and impulsivity after reintroducing coffee, regardless of caffeine content ^[3][5].

Interestingly, only decaffeinated coffee was associated with improvements in learning and memory, while caffeinated coffee was linked to reduced anxiety and enhanced vigilance and attention ^[5][4].

What Is Known

The studies collectively suggest that coffee consumption can influence the gut microbiome by increasing the abundance of specific bacteria. The presence of Lawsonibacter asaccharolyticus and other bacteria appears to be linked to various physiological and cognitive effects, such as reduced stress and improved cognitive functions ^{[1][2][3][4][5]}.

What Remains Unclear

While the studies provide insights into the relationship between coffee and gut bacteria, the precise mechanisms and long-term health implications remain uncertain. Further research is needed to understand the broader impact of these bacterial changes on overall health and whether these effects are consistent across different populations ^[1][3].