But is drinking 25 cups per day beneficial?
Some people drank up to 25 cups a day in the latter group - but the average was five cups a day.More news: Kyle Busch Wins The Pocono 400
"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", remarked Metin Avkiran, PhD, associate medical director at the British Heart Foundation, who partially funded the study.
"What we found was that drinking more than three cups of coffee a day did not significantly increase the stiffness of blood vessels compared to people who drink one cup or less a day", Kenneth Fung, who led the data analysis for the study, tells Amy Woodyatt at CNN. The reason for such a high number of people, according to the researchers, is because previous studies used fewer numbers of people and created inconsistent results whereby some people believed arteries stiffened due to coffee consumption, and others who did not. "It brings good news for coffee drinkers, and a further scientific element in support of our previous findings that coffee, far from being "bad for health" is on the contrary beneficial". The third group drank more than three cups, with some drinking up to 25 cups a day. But the arteries of those drinking that impressive amount were no more stiff than those who drank less than a cup a day.
He added: 'We would like to study these people more closely in our future work so that we can help to advise safe limits'. This new study of over 8,000 people in the United Kingdom debunks earlier work that claimed drinking coffee increases arterial stiffness.More news: Britain's INEOS to invest $2 billion in Saudi petrochemical complex
The researchers say the associations between drinking coffee and artery stiffness were corrected for contributing factors such as age, gender, ethnicity, smoking, height, weight, alcohol consumption, diet and high blood pressure.
Prof Metin Avkiran, associate medical director at the British Heart Foundation, said: "There are several conflicting studies saying different things about coffee, and it can be hard to filter what we should believe and what we shouldn't".
Researchers divided the more than 8,000 participants in the study into three groups.More news: Queen pays tribute to D-Day troops
The investigators noted that reports on coffee have been conflicting and confusing, and they hope their study will put these reports into perspective.