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A new scientific statement from the American Heart Association (AHA) suggests that drinking up to five cups of coffee a day is safe for most adults and may even be linked to a lower risk of several major health conditions.
Published on July 20 in the journal Circulation, the report reviews years of research on caffeine and heart health, drawing a distinction between coffee and synthetic caffeine products such as energy drinks, shots, and pills. The statement also reflects newer clinical research that challenges previous guidance advising many heart patients to avoid caffeine.
According to the AHA, regular coffee consumption has been associated with a lower risk of stroke, heart failure, and type 2 diabetes, although researchers noted that coffee’s relationship with blood pressure remains more complicated.
AHA says brewing method can affect coffee’s health benefits
“Coffee is potentially linked to lower risks of type 2 diabetes, stroke, and heart failure, though its relationship with blood pressure is complex and data isn’t entirely consistent across the board,” said Dr. Jennifer Miao, a board-certified cardiologist.
The review found that people who regularly drink coffee may have a 20% to 30% lower risk of developing type 2 diabetes. It also highlighted clinical trials showing that, even among patients who had undergone a procedure to treat an irregular heart rhythm, daily coffee consumption was linked to a 39% lower risk of the condition returning.
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Researchers cautioned that not every type of coffee offers the same potential benefits.
The report states that the positive heart associations apply specifically to paper-filtered and instant coffee. Unfiltered brewing methods, including French press, espresso, and Turkish coffee, retain a natural compound called cafestol, which can increase low-density lipoprotein (LDL), commonly known as “bad” cholesterol.
The AHA also emphasized that these findings should not be applied to synthetic caffeine products.
“The AHA distinguishes between coffee and energy drinks, which can pose significant cardiovascular harm,” said Miao. “In large amounts, energy drinks can trigger life-threatening heart rhythm issues and even cardiac arrest.”
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According to the statement, high caffeine energy drinks have consistently been linked to sudden increases in blood pressure and episodes of irregular heart rhythms, even in otherwise healthy adults.
Researchers also noted that individual caffeine tolerance varies based on genetics. Variations in a liver enzyme gene known as CYP1A2 influence how quickly caffeine is metabolized, meaning some people can comfortably consume up to 400 milligrams of caffeine per day, roughly equivalent to three to five cups of coffee, while others may experience side effects with much smaller amounts.
The AHA says people with existing heart conditions or those at higher risk of heart disease or stroke should speak with their healthcare provider about how much caffeine is appropriate for them.
“Consume caffeine in moderation, not solely for potential health benefits,” Miao advised. “Everyone’s sensitivity is different, so if you have any underlying conditions or concerns, please talk to your doctor.”
As more research explores coffee’s long-term effects on the body, scientists have also examined its potential role in brain health.
One recent study found that drinking two to three cups of coffee a day was associated with a lower risk of developing dementia, adding to growing research into caffeine’s possible cognitive benefits.
The latest findings also follow other research into everyday habits that may support brain health. Earlier this year, one researcher explained why performing simple daily tasks with your non-dominant hand could help stimulate the brain and potentially reduce dementia risk.
Researchers have also looked beyond diet when studying cognitive health. Separate research has suggested that regularly playing brain training games could help slow cognitive aging by as much as a decade, highlighting the growing interest in lifestyle habits that may support long-term brain function.
