Daily Coffee Could Compromise Antibiotic Effectiveness
Coffee is something many people enjoy regularly, but a new study suggests that consuming it alongside common antibiotics might increase the risk of contracting serious bacterial infections.
Researchers from multiple countries examined nearly 100 chemical substances to see how they impacted E. coli, a bacterium known for causing symptoms like diarrhea and vomiting.
What they discovered is particularly concerning: caffeine—found in coffee—appears to make E. coli absorb less of the antibiotic ciprofloxacin (Cipro), commonly used for treating a range of infections.
This interaction could render such antibiotics less effective against E. coli, leading to what is known as antibiotic resistance. In severe cases, this resistance can result in infections that are difficult or impossible to treat, significantly raising the risk of serious health complications.
The effect of caffeine was exclusive to E. coli, which is responsible for more than 250,000 infections in the U.S. annually. Interestingly, caffeine did not show the same impact on other bacteria, like salmonella.
Given that about two-thirds of Americans drink coffee daily—along with other sources of caffeine like tea and energy drinks—the findings raise important questions about dietary habits in relation to medication effectiveness.
The main sources of E. coli contamination include undercooked ground beef and leafy greens, as well as unpasteurized dairy products.
Caffeine in drinks like coffee may lower the effectiveness of common antibiotics, a new study has suggested.
Infections caused by E. coli can lead to serious health complications, including bloody diarrhea and kidney failure. While most people recover within a week, some face life-threatening conditions.
Each year, around 265,000 Americans become ill due to E. coli, with more than 3,000 needing hospitalization and roughly 61 dying from complications.
Published last month in PLOS Biology, this study evaluated various substances, including antibiotics and everyday chemicals like caffeine, to understand their effects on E. coli and other bacteria.
Focusing on transporter genes—crucial to cellular function—the research found that caffeine activates a protein called Rob, which limits the amount of Cipro that can enter bacterial cells, thereby reducing its efficacy.
Ana Rita Brochado, a biological engineer involved in the study, explained that caffeine initiates a chain reaction that alters the transport mechanisms in E. coli, affecting its ability to absorb certain antibiotics.
However, it’s worth noting that these findings were based on cell samples, leaving the question of whether similar results would be observed in humans open. The researchers intend to conduct further studies to investigate this.
The study found caffeine affected the antibiotic ciprofloxacin (Cipro), which is prescribed approximately 4 million times a year in the US.
It’s also uncertain how much caffeine is needed to weaken antibiotics like Cipro against E. coli, and whether the source of caffeine—be it coffee, tea, or energy drinks—matters. Cipro is filled about 4 million times each year, making it one of the most widely prescribed antibiotics.
The researchers concluded that understanding how substances affect transport functions in bacteria is important for developing strategies to combat antibiotic resistance.
