However, a study of 8,412 people across the United Kingdom found that having up to 25 coffees a day was no different to having less than one.
The study's participants consumed an average of 5 cups of coffee per day - in the lower end of the spectrum, participants drank less than one cup per day, and on the other end participants drank up to 25 per day.
Coffee fans have been getting mixed messages about their favorite drink for years, including previous studies that suggest coffee is bad for your heart.
If they become stiff, it can increase the workload on the heart and increase the chance of a heart attack or stroke.
Coffee may not be as risky to heart health as past research has indicated, a new study has found.
The first group was made up of participants who drink less than one cup of coffee a day, the second contained those who drink between one and three cups a day, and the third was made up of people who drink more than three.
To confirm their findings, the researchers took factors that can affect the arteries into account, including age, sex, ethnicity, smoking, height, weight, alcohol consumption, diet and high blood pressure. "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". The research is part of a larger body of studies that have analyzed various aspects of the wildly popular beverage which, for many people, is part of a daily ritual.
"We would like to study these people more closely in our future work so that we can help to advise safe limits", he said.
Prof Metin Avkiran, the BHF associate medical director, said the study "rules out one of the potential detrimental effects of coffee on our arteries".
He added: "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".
In order to ensure a correct analysis the researchers studied over 8,000 participants in the UK.
The investigators noted that reports on coffee have been conflicting and confusing, and they hope their study will put these reports into perspective.