For a substance millions of people rely on every morning, caffeine has
always had a slightly murky relationship with cardiovascular health. A new
scientific statement from the American Heart Association, published in the
journal Circulation, tries to settle some of that murkiness, and the takeaway is more
reassuring than many might expect.
The statement, chaired by Dr. Gregory M.
Marcus of UC San Francisco, concludes that for most adults, up to 400 mg of
caffeine per day, roughly 3 to 5 cups of regular black coffee, is not just
safe, but may actually be linked to a lower risk of
several cardiovascular problems, including coronary heart disease, heart
failure, and stroke. That’s a notable shift from the old, cautious “everything
in moderation, maybe skip the coffee” advice.
The nuance is in the details, though. The benefits
seem tied specifically to black coffee, no sugar, cream, or flavored syrups,
and the writing group is upfront that it’s hard to separate caffeine’s effects
from those of other compounds in coffee, some of which have antioxidant and
anti-inflammatory properties of their own. Since most of the underlying
research is observational, it can show associations, not proof of cause and
effect.
A few specific findings stand out.
Drinking more than 3 cups a day was associated with a lower risk of high blood pressure, even though 1–3 cups was linked to a
slightly higher risk, a counterintuitive dose-response curve the authors
themselves flagged as surprising. Coffee consumption was also linked to a
reduced risk of atrial fibrillation in randomized trials, even as it was
associated with more frequent minor extra heartbeats (PVCs), which are usually
harmless. And people who like their coffee unfiltered, espresso, French press,
Turkish coffee, should know that a compound called cafestol in unfiltered brews
is linked to higher LDL (“bad”) cholesterol; paper filters remove it.
Where the statement draws a hard line is energy
drinks. Their caffeine is far more concentrated, some energy shots pack 3 to 4
times more caffeine per ounce than regular coffee, and higher doses like that
are linked to real cardiovascular harm, including spikes in blood pressure and
arrhythmia risk, especially in young, otherwise healthy people.
The bottom line the authors want people to take away:
there’s no universal “safe” number, since genetics, metabolism, age, and
existing health conditions all shape how someone responds to caffeine. But for
most people, their daily coffee habit isn’t something to feel guilty about.
Original source: American Heart Association, “Coffee and heart health: How many cups of caffeinated coffee are safe to drink each day?” Scientific Statement published in Circulation, July 20, 2026. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001454
No comments:
Post a Comment