alt.hn

7/20/2026 at 3:00:27 PM

Caffeine and Cardiovascular Disease: AHA Scientific Statement

 https://www.ahajournals.org/doi/epub/10.1161/CIR.0000000000001454

by brandonb

7/20/2026 at 4:27:51 PM

> Randomized controlled trial data among regular caffeinated coffee drinkers showed that caffeinated coffee decreases the risk of atrial fibrillation occurrence but increases the frequency of premature ventricular contractions

That is interesting because caffeine as low as ~80mg is one of my triggers for AFIB and arrhythmia and absolutely wrecks me within 15 minutes of consumption. I was not a regular coffee drinker though, so maybe the "regular drinkers" bit in that statement is the significant factor here.

by y-c-o-m-b

7/20/2026 at 4:31:03 PM

The lead author ran a study of personalized trigger mapping for Afib, using an n-of-1 study design: https://jamanetwork.com/journals/jamacardiology/fullarticle/...

Unfortunately this particular intervention wasn't successful (not much difference between treatment and control groups). But conceivably, afib triggers is something that varies from person to person and perhaps a future design would tease this out.

by brandonb

7/20/2026 at 4:46:24 PM

Interesting to see dehydration on there. I never even thought of that as a possible trigger. It's good to see this is specifically looking at Paroxysmal AFIB patients as that's what I fall under. Mine is very mild and self-corrects within hours to a few days.

Biggest triggers are caffeine, alcohol, and sleep deprivation (correlated with my sleep apnea events) for me. I see exercise is only reported as being slightly higher than caffeine here, but exercise (stationary bike, strength training) usually causes my episodes to self-correct; I usually attribute this to the more controlled breathing during exercise, but I have no proof. I also seem to have a much larger threshold of triggering AFIB with alcohol than I do coffee. I have to reach the moderately drunk stage to induce a flare with alcohol. If I keep things near a light-buzz, I can typically get away with no issues.

by y-c-o-m-b

7/20/2026 at 5:42:09 PM

Doctors blamed my first afib episode on dehydration. I had been very sick, could not eat or drink for days, and just experienced the highest fever of my adult life, nearly 105F. A few hours after the fever finally broke, I went into afib.

At that time, I was on an opioid pain killer for an abscess. The next time I was on an opioid pain killer, years later, I also had an afib episode. So I wonder if maybe I have some sensitivity to opioids.

by nabbed

7/20/2026 at 6:33:43 PM

Electrolyte imbalances (alcohol, dehydration), and catecholamine surges (sleep deprivation, stress) are excellent triggers

by eur0pa

7/20/2026 at 4:53:49 PM

dehydration impacts electrolyte balance, the muscle cells of the heart work through moving these ions through their membrane. changes in the concentrations changes both the rhythm and rate depending on how the concentrations of each ion is shifted

by ahueb

7/20/2026 at 4:20:24 PM

It appears this study does not conclude whether abstainers should pick up caffeine.

Under "Conclusions and Research Needs":

> Last, in terms of applications of the potential beneficial effects of coffee intake, it is worth studying whether introducing or initiating regular coffee consumption among current abstainers yields positive cardiovascular health benefits.

In other words, more study is needed to determine whether abstainers should start consuming caffeine.

Additionally, the study suggests much of the cardiovascular benefits are from non-caffeine compounds in coffee/tea:

> Although much of the evidence on caffeine derives from studies of coffee consumption, coffee contains numerous bioactive compounds beyond caffeine, including chlorogenic acids, diterpenes, trigonelline, and melanoidins. In large cohort studies, inverse associations between coffee intake and risk of type 2 diabetes and cardiovascular disease have also been observed for decaffeinated coffee, supporting a role for noncaffeine components.

by jader201

7/20/2026 at 4:38:29 PM

Abstainers become regular drinkers in 2 weeks if they keep drinking coffee. What can be gained from testing abstainers for medium or long term health effects

by ipaddr

7/20/2026 at 4:02:15 PM

Concluded is "...dose-response and thresholds in individuals with hypertension and other cardiovascular diseases. Because there is already substantial evidence of heterogeneous effects within individuals...". Sensitivity to caffeine is one of the most accurate and valuable results you can get from a DNA test. We all know people that drink it all day and sleep all night, and the reverse.

by IndySun

7/20/2026 at 3:54:15 PM

This statement is particularly interesting as it goes against the common sense, and the common suggestion that some (most?) cardiologists and doctors give to cardiac patients (lower / no caffeine).

However, some arrhythmologists and electrophysiologists sing a different tune. When I was diagnosed with something complex and novel that results in ventricular arrhythmia (PVCs and VT), my EP was, to put it mildly, uninterested in my consumption of caffeine. He said that, at worst, it made no significant difference. That was a few years ago. I was pleasantly surprised.

by eur0pa

7/20/2026 at 5:30:54 PM

I have paroxysmal afib. After my third episode, the doctor told me to quit consuming caffeine. Before quitting caffeine, I had an episode every 2 years. After quitting caffeine, I had an episode every 2 years. So I believe the statement that coffee is not associated with higher incidence of afib (at least in the general case... as the article states, your mileage may vary).

One the other hand, I find that dark chocolate has more negative heart effects: I associate dark chocolate, maybe unfairly, with premature beats (several 1000s per day). For that reason, I've avoided dark chocolate, which I love, for almost 25 years.

by nabbed

7/20/2026 at 8:37:19 PM

> This statement is particularly interesting as it goes against the common sense

could you give some explanation why it is against common sense exactly in your opinion?

by andriy_koval

7/21/2026 at 6:36:54 AM

Because usually doctors and cardiologists recommend people drink less caffeine, as it tends to increase blood pressure (hence a cascade of things you want to avoid in hypertensive and cardio patients), disrupts sleep quality to some degree, and might increase the ectopic burden

by eur0pa

7/21/2026 at 3:24:12 PM

Similarly, blood pressure increases during running, doctors and cardiologists also recommend to run less, lol?

by andriy_koval

7/20/2026 at 3:51:00 PM

AHA as in American Heart Association. Not "Aha! Journals" (which would be a rather corny name for a scientific publisher)

by HPsquared

7/20/2026 at 5:58:19 PM

Well, there is Eureka[!] magazine: https://mathigon.org/eureka

by tomjakubowski

7/20/2026 at 6:29:32 PM

That gets a whimsy pass for the recreational tilt.

by HPsquared

7/20/2026 at 4:32:08 PM

(OP) Updated the title. This was unfortunately a mis-fire of some of HN's automatic title formatting.

by brandonb

7/20/2026 at 6:00:53 PM

I thought it was an “Aha” moment :)

by bicepjai

7/20/2026 at 4:21:53 PM

I thought it meant like this was an “Aha! Moment”

by idontwantthis

7/20/2026 at 3:59:14 PM

Why can’t it be both?

by rubyfan

7/20/2026 at 6:04:18 PM

Can't really trust the AHA whose guidelines promoted ultra-processed sugar-filled food.

by Cider9986

7/20/2026 at 8:39:37 PM

Wondering if you could give us specifics..

by andriy_koval

7/20/2026 at 7:03:04 PM

Once money or prestige gets in play, science leaves the room

by readthenotes1

7/20/2026 at 3:50:39 PM

Unrelated: The document viewer on this website has a semitransparent gradient at the top, which shows a pretty strong horizontal Mach band [1] at its bottom. Any ideas how to avoid these in CSS?

1: https://en.wikipedia.org/wiki/Mach_bands

by cubefox