Coffee: By the Numbers

Another coffee study, this one finds it’s OK to drink 25 cups a day

Even 25 cups of coffee a day won’t cause your arteries to stiffen, a new study states. 

>> Read more trending news 

Led by professor Steffen Petersen from Queen Mary’s William Harvey Research Institute, the study contradicts recent research that determined six or more cups of coffee a day increases a person’s risk of cardiovascular disease by 22%.

Peterson’s research, partly funded by the British Heart Foundation, studied arterial stiffness in 8,412 participants and found no difference between those who drank less than a cup a day and those who drank as much as 25 cups of coffee.

 >> Related: Study finds there is such a thing as too much coffee

“Although our study included individuals who drink up to 25 cups a day, the average intake amongst the highest coffee consumption group was 5 cups a day,” said Kenneth Fung, who led the data analysis for the research at Queen Mary University of London. “We would like to study these people more closely in our future work so that we can help to advise safe limits.”

A study last month from the University of South Australia suggests the “safe limit” is five cups a day.

"In order to maintain a healthy heart and a healthy blood pressure, people must limit their coffees to fewer than six cups a day — based on our data six was the tipping point where caffeine started to negatively affect cardiovascular risk," professor Elina Hyppönen, one of the study’s researchers said.

>> Related: Drink a lot of coffee? You’re more likely to live longer, study finds

That study found that people who drink one to two cups of caffeinated coffee a day had a lower risk of cardiovascular disease than people who drank decaf or no coffee at all. But for individuals who consumed six or more cups of caffeinated coffee a day, the risk of cardiovascular disease increased 22%.

“There is much more reason to be concerned about a host of other dose-related effects, from blood pressure elevation, to heart rate elevation, to cardiac dysrhythmias,” David Katz, a director at the Yale-Griffin Prevention Research Center and author of “The Truth About Food,” told HuffPost. “More importantly, extreme coffee consumption is likely to be associated with harms unrelated to the heart, such as insomnia, agitation, and possibly a range of other metabolic effects, from microbiome to bone density.”

>> Related: 8 things you never knew about coffee 

Professor Metin Avkiran, associate medical director at the British Heart Foundation, said: “Understanding the impact that coffee has on our heart and circulatory system is something that researchers and the media have had brewing for some time.
“There are several conflicting studies saying different things about coffee, and it can be difficult to filter what we should believe and what we shouldn’t. This research will hopefully put some of the media reports in perspective, as it rules out one of the potential detrimental effects of coffee on our arteries.”

Fung added: "The main message for people to take away from this is that coffee can be enjoyed as part of a healthy lifestyle, and coffee lovers can be reassured by this result in terms of blood vessel stiffness outcomes.

>> Related: 7 health myths debunked in 2018

"We're not telling people to drink 25 cups a day per se. If anything, if you drink within recommended guidelines, then we don't expect to see an increase in arterial stiffness compared with those who drink one cup or less a day."

Yet another study on coffee and this one discovered you can drink as many 25 cups a day with no detrimental effects to your arteries.
Photo: Pixabay

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