Consuming up to 25 cups of caffeinated beverage a day is still safe for heart health, a new study suggested.

More than 8,000 people were divided into three groups: those who drank less than one cup of coffee a day, those who drank between one and three cups, and those who drank more than three, with some in the group drinking up to 25 cups a day.

All the participants included in the study were given MRI heart scans and infrared pulse wave tests.

"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 at Queen Mary University of London, told CNN.

"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,” he said.

"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," he added.

"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,” said Professor Metin Avkiran, associate medical director at the British Heart Foundation, said in a press release.