Caffeine May Reduce Effectiveness of Some Antibiotics Against E. coli

Studies conducted on Escherichia coli (E. coli) bacteria have revealed that caffeine may reduce the absorption of antibiotics by these bacteria.

According to the research, consuming one cup of coffee daily might weaken the effectiveness of some antibiotics, such as ciprofloxacin, in combating E. coli bacteria.

An international team of researchers examined 94 different chemical substances and their effects on the systems that regulate the entry and exit of materials in bacterial cells.

They found that about one-third of the tested substances influenced the genes responsible for transporting materials into and out of the cell. Among these, caffeine had the most significant effect, decreasing E. coli’s absorption of certain antibiotics, including ciprofloxacin.

The study, published in the journal PLOS Biology, identified a protein called Rob as playing a larger role than previously understood in regulating material transport within bacterial cells. Rob is involved in roughly one-third of the changes observed by the researchers, including those linked to caffeine’s impact.

Biological engineer Ana Rita Bragado from the University of Tübingen in Germany explained that caffeine initiates a series of changes beginning with the modification of the activity of the regulatory gene Rob. This subsequently leads to alterations in the function of transport proteins within E. coli, thereby reducing the uptake of some antibiotics.

It is important to note that these findings are based on laboratory experiments, and the extent of this interaction inside the human body or the amount of coffee required to produce a real effect on antibiotic efficacy remains unclear. The study also points out that this effect was not observed in other bacteria such as Salmonella enterica, indicating that the response may be specific to certain bacterial species.