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Up to 5 Cups of Coffee a Day May Be Safe for Most Adults, Heart Experts Say
A new scientific review offers reassurance for coffee drinkers over 50, with cautions about cup size, cholesterol and caffeine sensitivity
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Key takeaways
- For most adults, up to 400 milligrams of caffeine a day, about three to five 8-ounce cups of coffee, appears to be safe.
- Moderate coffee drinking is linked to lower rates of several heart conditions, but the research does not prove coffee caused the difference.
- Energy drinks, energy shots and other concentrated caffeine products may pose greater risks than coffee.
Your morning coffee habit just got a vote of confidence.
In a new scientific review published in Circulation, the American Heart Association (AHA) says most adults can safely consume up to 400 milligrams of caffeine a day, roughly three to five 8-ounce cups of coffee. The authors analyzed research on caffeine and high blood pressure, coronary artery disease, stroke, heart failure and abnormal heart rhythms.
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This broad finding also applies to older adults. People over 50 do not need to reduce caffeine consumption just because of their age, according to the experts who wrote the review. But they say sleep problems, blood pressure, palpitations and individual sensitivity may still be reasons to cut back.
“There is no strong evidence that limits should change as adults age,” says Marilyn Cornelis, an associate professor of preventive medicine at Northwestern University Feinberg School of Medicine and a coauthor of the review. “If you have been consuming a set amount for years with no adverse effects attributable to caffeine, there is no reason to purposely cut back.”
Dr. Aaron Troy, a cardiovascular medicine fellow at Johns Hopkins and director of the Johns Hopkins Healthy Heart Aging Program, says the bigger question is how coffee fits in with a person’s health and daily routine. Troy was not involved in writing the AHA review.
“Your caffeine intake should be guided by your individual health goals, lifestyle and medical conditions,” he told AARP.
That matters for older adults who are managing certain health conditions.
“If drinking one to two cups of coffee or tea early in the day supports an active lifestyle that includes exercise and social connection, your caffeine intake could be providing significant health benefits,” Troy says. “If, on the other hand, you have active heart conditions, take medications that interact with caffeine, have trouble falling asleep at night or are interested in trying higher-concentration energy drinks, it would be worth talking to your medical team about your caffeine intake to make decisions that align with your health goals.”
If you have trouble getting good quality sleep, many sleep experts recommend avoiding caffeine at least eight hours before bedtime.
Know your serving cup size
The AHA’s 400-milligram limit sounds simple, but in real life, it is not.
An 8-ounce cup is smaller than many home mugs and coffee-shop drinks. Depending on what you order, you may reach 400 milligrams sooner than you think.
“Four hundred milligrams of caffeine can look very different based on the specific beverage and cup size you’re consuming,” Troy says. “It can look like just under two 12-ounce cups of coffee from a coffee shop, four 8-ounce cups brewed at home or as many as eight 8-ounce cups of black or green tea.”
Coffee is not the only source of caffeine. Energy drinks, dark chocolate, soft drinks, some over-the-counter medications, guarana, yerba mate and supplements marketed for energy or workouts can add to the daily total, Troy says.
The AHA review found that moderate coffee drinking does not appear to raise heart risk for most adults. In many studies, coffee drinkers had lower rates of heart disease, stroke and heart failure.
That does not prove coffee prevents those conditions. Most of the research was observational, meaning researchers found a connection but could not prove that coffee caused the lower risk.
Other research has linked moderate coffee drinking to other health benefits, including a lower risk of type 2 diabetes, heart failure, stroke, dementia and early death. As with the AHA review, most research on coffee shows associations and does not prove coffee caused the benefit.
“The good news is that most people who enjoy drinking caffeinated coffee and have not noticed any problems doing so can almost certainly continue, even if they have a history of heart disease, high blood pressure or palpitations,” says Dr. Gregory M. Marcus, who chaired the volunteer writing group for the AHA scientific review. Marcus is a professor of medicine at the University of California – San Francisco School of Medicine and associate chief of cardiology for research at UCSF Health.
Five cups is a limit, not a goal
The AHA is not telling people to start drinking coffee or work their way up to five cups.
Some people can drink several cups and feel fine. Others may feel jittery, anxious or notice their heart racing after much less.
Marcus says people who notice “an uncomfortable racing, powerful or irregular heartbeat” may have had too much caffeine and should tell their doctor how much they drink.
Trouble sleeping can also be a sign to cut back or stop drinking coffee earlier in the day.
Coffee and irregular heartbeats
People with an irregular heartbeat often wonder whether they need to give up coffee. The answer is not always yes.
The review found that drinking one to three cups of coffee a day was generally not linked to a greater risk of atrial fibrillation, a common irregular heart rhythm.
Caffeinated coffee may, however, increase premature ventricular contractions (PVCs). These extra beats can feel like a flutter, thump or skipped beat.
“In contemporary studies, regular moderate coffee consumption does not appear to increase risk of developing atrial fibrillation,” Troy says. “However, coffee has been found to increase frequency of PVCs and can increase your heart rate, so people who feel coffee is a trigger for their palpitations could consider gradually cutting back to see if it helps.”
Caffeine and blood pressure
Caffeine can raise blood pressure temporarily. Its long-term effects on blood pressure are less clear, according to the Mayo Clinic.
People with severe high blood pressure or a strong sensitivity to caffeine may face more risk at higher doses, the AHA review says.
For someone concerned about symptoms or blood pressure, gradually switching to decaf may be worth a try, says Rob van Dam, a professor at George Washington University’s Milken Institute School of Public Health and a coauthor of the review.
“If there are concerns, one could gradually switch to decaffeinated coffee and monitor whether this benefits symptoms and blood pressure,” he says.
Your brewing method matters
The way you brew coffee can affect your cholesterol levels. French press, Turkish and other unfiltered coffees contain cafestol, a compound that can raise LDL, or “bad,” cholesterol. Paper filters remove most of it, according to the AHA report.
“Unfiltered coffees such as French press and Turkish brews, and espresso to a lesser degree, contain high concentrations of diterpenes, compounds that can significantly raise your cholesterol, increasing your risk of heart attack and stroke,” Troy says. “Drip-filtered and instant coffee contain negligible amounts of diterpenes and have no significant impact on cholesterol levels.”
Cornelis says people with high cholesterol do not necessarily have to give up coffee.
“If I have high cholesterol, I would take comfort knowing that a simple filter might make the difference and I can still enjoy my coffee,” she says.
Energy shots are not the same as coffee
The reassuring findings about coffee do not automatically apply to energy drinks and energy shots. These products can pack a large amount of caffeine into a small serving and deliver it quickly.
“Energy drinks and particularly energy shots can deliver much higher doses over a shorter period of time. An energy shot can deliver more caffeine than two standard coffees in seconds,” Troy says.
The AHA review says the limited research on high-dose caffeine generally points to possible heart risks, including higher blood pressure and abnormal heart rhythms.
Marcus says concentrated caffeine may be harder for the body to handle, and ingredients such as sugar and taurine may also play a role.
“Caffeine in higher doses and synthetic products such as energy drinks have not been nearly as well studied as caffeinated coffee, but the available data does suggest these are more likely to cause harm,” he says.
For most adults who enjoy coffee and feel fine after drinking it, the new review offers reassurance.
The key takeaways were created with the assistance of generative AI. An AARP editor reviewed and refined the content for accuracy and clarity.
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