If coffee makes you run to the bathroom it may not be the caffeine messing with your stomach. If you’ve experienced nausea or just a bad feeling after drinking coffee read on.
A team of microbiologists from Spain’s University of Valencia discovered coffee makers are breeding grounds for bacteria.
The researchers tested coffee collected in the drip trays of nine different Nespresso machines. They also looked at their own office Krups Inissia over two months to study bacteria’s colonization process. The results were published in the journal Scientific Reports.
There were 35 to 67 different types of bacteria breeding in each machine’s drip tray, including pathogenic strains—that is, bacteria that can make you sick. Each type of bacteria contains several different species.
The researchers only counted the number of different bacteria types in their samples, not the total cells. A CBS investigation earlier this year found bacteria including staphylococcus and E. coli on the Keurig machines it swabbed. More than half were harboring millions of bacteria cells.
While this research focused on bacteria in Nespresso machines, it’s safe to assume that bacteria doesn’t discrimate amongst machines. there is a a big benefit in extending the research into caffeine itself.
Caffeine is a big polluter and can potentially be used to determine whether wastewater (what goes down your sink drain and flushes your toilet) has been properly treated. By identifying which bacteria like caffeine, researchers are able to pinpoint which microbes are able to break down the chemical, leading to not only easier decaffeination of everybody’s favorite bean, but also newer and better treatments for polluted groundwater.
The takeaway – clean your coffee machines.