Coffee is usually thought to be good for your heart if you drink it in moderation, but people with very high blood pressure might not want to drink it.
A study that came out on Wednesday in the Journal of the American Heart Association found that people with very high blood pressure who drank two or more cups of coffee a day were more likely to die from heart problems.
People who drank two or more cups of coffee were about twice as likely to die from heart problems as people who didn’t drink coffee.
People with very high blood pressure who drank a lot of coffee were more likely to get sick, but this wasn’t the case for people with normal or slightly high blood pressure. The study was written by a group of Japanese scientists who looked at the health records of 18,609 people between the ages of 40 and 79.
The study found that drinking any amount of green tea did not change the heart’s health.
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The main author of the study, Hiroyasu Iso, told the American Heart Association that it was the first to find a link between drinking coffee and dying from heart disease in people with very high blood pressure.
Blood pressure is the force in your arteries when your heart beats (systolic blood pressure) and when your heart is at rest (diastolic blood pressure) (diastolic blood pressure). When your systolic blood pressure is at least 130 mm Hg and your diastolic blood pressure is at least 80 mm Hg, you have high blood pressure.
The people who did the study said that blood pressure was “very high” if it was at least 160 mm Hg over at least 100 mm Hg.
“These results may back up the idea that people with very high blood pressure shouldn’t drink too much coffee,” Iso said in a press release from the AHA.
The AHA doesn’t have an official recommendation for how much coffee to drink, but on its website, it says that drinking one to two cups per day “doesn’t seem to be harmful.”
Previous research has shown that drinking one to three mugs of coffee a day might be good for your heart. A paper from last year that looked at three studies, including one that followed 21,000 adults for at least 10 years, found that drinking two cups of coffee per day could lower the risk of heart failure by 30%. Sara Lindberg of Insider reported that previous research found that drinking about three cups of coffee a day could also lower the risk of heart disease.
A large paper from earlier this year that looked at the health of 171,000 people in the UK found that people who regularly drank unsweetened coffee were 16–21% less likely to die than their peers who didn’t drink coffee.
But more recent studies have shown that coffee may have some bad effects. A recent study published in the Journal of the American Medical Association found that drinking coffee while pregnant could affect the height of the child when they grow up.
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