FIELD NOTE #5: Sauna Stories Episode One
There’s a woman at my local gym who has never once considered the existence of an inside voice. She holds court in the sauna like she’s giving a TED Talk — thick accent, full volume, zero awareness that she’s essentially screaming inside a small, crowded, cedar-lined box created to instill a sense of relaxation.
A few months back, a father came in with his special needs son, both regulars. The woman had already rocketed into her usual soliloquy, bellowing about her daughter’s brilliance in medical school. The son, quickly reaching his limit, began huffing and muttering under his breath, finally responding loudly to the woman with one of two phrases, delivered with perfect timing and context:
WOMAN: (shouting) JUST LAST WEEK, MY DAUGHTER TOLD ME—
SON: Spaghetti meatballs.
WOMAN: (taken aback) Uh. Anyway, her professor SAID THAT MY DAUGHTER WAS THE BEST—
SON: Bart Simpson! Spaghetti meatballs!
Every night my family hounds me for the latest “Sauna Story” overheard in, as I’ve come to call it, “The Sardine Sweatbox.” More importantly, my family has adopted “spaghetti meatballs” as code for anyone talking uncomfortably loud in public. You’d be surprised how many opportunities we’ve had to use it.
Despite the routine insanity, the sauna has become a mainstay of my routine.
THE RABBIT HOLE
Back near the beginning of the Selfaissance, I stumbled across a YouTube video (it’s long, so best listened to as a podcast) discussing the health benefits of sauna. To that point, my sauna history dated back to my childhood when I was grounded for peeing on the hot rocks at a ski hotel.
What I found is that the sauna — specifically dry heat (not infra-red) at a minimum of 160°F, used consistently — has some of the most compelling longevity data in the habits space. Long-term, large-population, decades-long data.
THE SCIENCE
The landmark work comes from a Finnish research team led by Dr. Jari Laukkanen, who followed over 2,300 middle-aged men in eastern Finland for more than twenty years. Finland is arguably the only country on earth where you can get this kind of sauna data, because a Finn without a sauna is like an American without a TV — technically possible, but culturally suspicious.
Laukkanen found that compared to men who used the sauna once a week, men who used it four to seven times per week had a 63% lower risk of sudden cardiac death, a 48% lower risk of fatal coronary heart disease, and a 40% lower risk of all-cause mortality. A separate analysis from the same cohort found that the most frequent users had a 66% lower risk of dementia and a 65% lower risk of Alzheimer's disease, compared to once-weekly users.
These are massive numbers.
To be precise, this is observational data, meaning the researchers tracked what people did and what happened to them over time — they didn’t randomly assign people to saunas. So the relationship is association, not proven cause. Frequent sauna users may also have other healthy habits that contribute. But the dose-response relationship — more sessions per week, better outcomes, consistently — is the kind of pattern that earns serious scientific attention. And twenty-plus years of follow-up on thousands of people is not a small study.
The cardiovascular and longevity data is the strongest case. The cognitive data is striking enough to take seriously even with the observational caveats. Taken together, this is one of the better-studied low-effort habits in the longevity toolkit — and “low effort” is doing real work in that sentence. You sit. In a hot (hopefully quiet) room. That’s the protocol.
WHAT I DO
Six months in, I dry sauna at my local gym — four to five days a week at around 160-175°F — depending on the crowd — immediately after my workout and before I shower. I started at ten minute sessions and slowly built up to twenty over the first few weeks.
I hydrate both before and after. I also leave out any electronics — over time, the heat can create thermal stress on the batteries and cause internal condensation.
That last part might be an underrated benefit — twenty minutes a day in a room where scrolling is not an option.
Just heat, and your thoughts, and Bart Simpson.
STUDIES CITED
Laukkanen, T., et al. (2015). Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine, 175(4), 542–548. https://doi.org/10.1001/jamainternmed.2014.8187
Laukkanen, T., et al. (2017). Sauna bathing is inversely associated with dementia and Alzheimer’s disease in middle-aged Finnish men. Age and Ageing, 46(2), 245–249. https://doi.org/10.1093/ageing/afw212