The real sauna benefits are recovery, stillness, and a cleaner protocol. This piece separates longevity signals from stories the evidence cannot hold.
Video·The Kevin Bass Show·8 min read·May 17, 2022
A grounded look at why confident sauna-longevity claims need more caution than the podcast version allows. The article follows the evidence trail from mortality statistics to heat shock proteins, dynorphin, and the limits of mechanistic storytelling.
The Claim Under Review
Longevity claims ask for precision. When a protocol enters the culture with the promise of fewer fatal events and a longer life, the standard rises. The ritual can still hold value, but the evidence must carry the weight placed on it.
Kevin Bass frames his video as a systematic check of Andrew Huberman's sauna claims from a Lex Fridman podcast clip. The claim under review is direct: regular sauna use, performed thirty minutes two or three times per week, was presented as reducing the likelihood of dying from a cardiovascular event by 27 percent. More frequent use was presented as even stronger.
Bass narrows the review to three linked ideas. First, he examines the mortality benefit itself. Then he turns to heat shock proteins, the repair-focused explanation often used to make sauna sound like a longevity engine. Finally, he looks at dynorphin, the discomfort signal Huberman connects to heat and adaptation.
This is the right sequence. Start with the outcome people care about, then move inward toward the proposed mechanism. If the mortality evidence lacks causal strength, the mechanism cannot rescue it. A beautiful biological story does not transform a fragile association into proof.
We value sauna as a deliberate recovery ritual. Heat can create stillness, mark a pause in the day, and help you return to your body with more presence. That experience matters, but it is different from claiming that sauna itself sharply reduces all-cause or cardiovascular mortality.
The distinction protects the practice. Overstatement can make a useful protocol feel suspect once the evidence is tested. A calmer frame gives sauna room to be what it is: a sanctuary for recovery, not a certainty machine for longevity.
hey y'all this is uh kevin bass from the dot wars.com i'm a medical student and dot wars.com i'm a medical student and phd student phd student uh uh finishing my finishing my phd and about to finish my medical phd and about to finish my medical degree as well and head out to the uh degree as well and head out to the uh to the great world of clinical medicine to the great world of clinical medicine soon soon um um but in you know my spare time i like to but in you know my spare time i like to dispel misinformation and of course dispel misinformation and of course learn more about science and learn more about science and these two activities are actually these two activities are actually closely tied together for me because closely tied together for me because sometimes i'll hear some sort of claim sometimes i'll hear some sort of claim i'll be like hmm is that really true i'll be like hmm is that really true because i'm gonna know like if it's true because i'm gonna know like if it's true then maybe we can use that information then maybe we can use that information and then i'll look deeper into it i'll and then i'll look deeper into it i'll find find usually the more sensational claims are usually the more sensational claims are not true not true and so uh that's what i've done here and so uh that's what i've done here i saw this clip on youtube or sorry it i saw this clip on youtube or sorry it was instagram actually um was instagram actually um podcast number 277 in the lex friedman
podcast number 277 in the lex friedman podcast with andrew huberman podcast with andrew huberman and um and um they they're here they're talking about they they're here they're talking about sauna and i'm what i'm going to do now sauna and i'm what i'm going to do now is i'm going to systematically dismantle is i'm going to systematically dismantle um um this misinformation about sauna use this misinformation about sauna use i'll explain each and every i'll explain each and every like minute detail about why it's wrong like minute detail about why it's wrong and hopefully we can get this done and hopefully we can get this done pretty quick but i'm going to explain pretty quick but i'm going to explain every single claim every single claim let's let's hit it let's let's hit it if you get into the sauna the way i just if you get into the sauna the way i just described 30 minutes twice a week or described 30 minutes twice a week or three times per week you reduce the three times per week you reduce the likelihood of dying of a cardiovascular likelihood of dying of a cardiovascular event by 27 event by 27 if you do it four or more times per week if you do it four or more times per week you reduce the probability of dying by it's very clear that what you need is the release of something called the release of something called dinorphin which is the terrible feeling dinorphin which is the terrible feeling that you get when you're in really hot that you get when you're in really hot temperatures it's also the terrible temperatures it's also the terrible effect that alcoholics feel when they effect that alcoholics feel when they are in withdrawal that's what you're are in withdrawal that's what you're trying to trigger when you do that a trying to trigger when you do that a number of things happen you set off heat
number of things happen you set off heat shock proteins that go repair broken shock proteins that go repair broken proteins it also makes it so that later proteins it also makes it so that later endorphin binds its receptor more endorphin binds its receptor more strongly strongly all right so all right so in this uh video i'm going to address in this uh video i'm going to address three claims in particular three claims in particular first claim is his mortality benefit first claim is his mortality benefit claims which i think are claims which i think are not supported by the literature not supported by the literature and not supported by the evidence i'm and not supported by the evidence i'm going to explain exactly in precise going to explain exactly in precise detail how that is not the case detail how that is not the case second second thing i'm going to address is this heat thing i'm going to address is this heat shock protein claim that heat shock shock protein claim that heat shock proteins are responsible for the health proteins are responsible for the health effects of sauna effects of sauna there's no evidence that that's the case there's no evidence that that's the case and then last we're going to talk about and then last we're going to talk about about dinorphin and what we know about about dinorphin and what we know about dinorphin and in each case i'm going to show that [Music] [Music] it doesn't seem that any of his claims it doesn't seem that any of his claims are supported by anything are supported by anything uh in the scientific literature uh in the scientific literature okay so the first okay so the first claim that he made was based on this
claim that he made was based on this paper association between sauna bathing paper association between sauna bathing and fatal cardiovascular and fatal cardiovascular and all-cause mortality events and all-cause mortality events and it showed that the more frequency and it showed that the more frequency you have you have with the sauna with the sauna the uh the uh lower your risk lower your risk of cardiovascular events of cardiovascular events i'll cause mortality etc i'll cause mortality etc and his numbers that he used for and his numbers that he used for uh the podcast with lex are exactly the uh the podcast with lex are exactly the same numbers same numbers that were reported by this paper so it's that were reported by this paper so it's exactly the same thing the problem with this paper is that is that there was a commentary published by there was a commentary published by kivamaki kivamaki and it's called the link between and it's called the link between sonobathing mortality maybe non-causal sonobathing mortality maybe non-causal and i want to focus on one particular and i want to focus on one particular criticism in particular and i'm just going to read it off simple adjustment simple adjustment for disease versus no disease may not for disease versus no disease may not entirely solve
entirely solve the problem of converse causation bias the problem of converse causation bias because it operates within disease because it operates within disease groups the more severe disease groups the more severe disease the greater the fear of cardiac the greater the fear of cardiac challenge challenge consistent with this reasoning the consistent with this reasoning the association between saunas and cardiac association between saunas and cardiac death was seen in individuals with death was seen in individuals with diabetes but not without diabetes but not without uh among hypertensives but not normal uh among hypertensives but not normal intensive individuals among patients intensive individuals among patients with cardiovascular disease but not with cardiovascular disease but not their healthy their healthy counterparts a more robust finding counterparts a more robust finding at reduced risk of reverse causation at reduced risk of reverse causation bias would be a graded association bias would be a graded association between number of sauna sessions and between number of sauna sessions and mortality in an initially healthy mortality in an initially healthy cardiorespiratory fit population but cardiorespiratory fit population but this was not observed we urge caution this was not observed we urge caution against the interpretation that saunas against the interpretation that saunas are a major cardiovascular prophylactic are a major cardiovascular prophylactic and to respond to this and to respond to this um um well well the authors responded not very the authors responded not very compellingly and i'm going to compellingly and i'm going to explain why that's the case explain why that's the case but first i want to explain like exactly but first i want to explain like exactly what this means so
what this means so this the relationship between sauna this the relationship between sauna bathing and mortality and cardiovascular bathing and mortality and cardiovascular governance only existed governance only existed only existed only existed in people with disease in people with disease it didn't exist in healthy people it it didn't exist in healthy people it only existed in people with disease what only existed in people with disease what does this mean does this mean the idea is the idea is if it also existed in healthy people if it also existed in healthy people that would suggest that maybe that would suggest that maybe even in healthy people it's preventing even in healthy people it's preventing it's causally preventing it's causally preventing death or cardiovascular events but the death or cardiovascular events but the fact that it's only happening in sick fact that it's only happening in sick people suggests that among sick people people suggests that among sick people the people who are more sick the people who are more sick are just not able to go into the sauna are just not able to go into the sauna whether they're whether they're you know disabled or you know disabled or they're too fatigued or they're afraid they're too fatigued or they're afraid of the challenge of the sauna because of the challenge of the sauna because it's a quite stressful experience to be it's a quite stressful experience to be in the sauna in the sauna they're simply not going into the sauna they're simply not going into the sauna so actually sauna bathing frequency and so actually sauna bathing frequency and duration may be associated with just
duration may be associated with just reduced disease severity and if you have reduced disease severity and if you have reduced disease severity you're less reduced disease severity you're less likely to die of cardiovascular events likely to die of cardiovascular events in general in general in the uh the near future in the uh the near future so this relationship between sauna so this relationship between sauna bathing and lower risk of disease might bathing and lower risk of disease might actually reverse causation it's actually actually reverse causation it's actually you have lower risk of disease which you have lower risk of disease which causes you to be able to sauna bathe causes you to be able to sauna bathe more often more often and and this is again because this relationship this is again because this relationship between more sauna bathing and lower between more sauna bathing and lower risk of disease was not found in healthy risk of disease was not found in healthy people it was only found in people people it was only found in people at risk for disease or sorry with at risk for disease or sorry with diseases with hypertension with diseases with hypertension with cardiovascular disease with cardiovascular disease with diabetes it was not seen in healthy diabetes it was not seen in healthy people suggesting that there's a reverse people suggesting that there's a reverse causation problem going on here it's causation problem going on here it's people who are really sick people who are really sick who are unable to do sauna bathing who are unable to do sauna bathing versus people who are less sick with versus people who are less sick with those same diseases who are able to do those same diseases who are able to do sauna bathing who are dying more but not sauna bathing who are dying more but not because they're not doing sauna bathing because they're not doing sauna bathing but because
but because they're simply more sick they're simply more sick this is the problem with uh this is the problem with uh with um with um [Music] [Music] with epidemiological research now it's with epidemiological research now it's not that epidemiology isn't useful it is not that epidemiology isn't useful it is epidemiology is useful but you have to epidemiology is useful but you have to understand what the limitations are in understand what the limitations are in order to draw the right conclusions and order to draw the right conclusions and the right conclusions are being drawn in the right conclusions are being drawn in this particular case this particular case so let's go revisit the criticism real so let's go revisit the criticism real quick and then we're going to go address quick and then we're going to go address a response to the criticism by rhonda a response to the criticism by rhonda patrick so here the criticism is patrick so here the criticism is simple adjustment for disease versus no simple adjustment for disease versus no disease may not entirely solve this disease may not entirely solve this problem problem since reverse causation bias since reverse causation bias operates within disease groups operates within disease groups okay so but so so ronna patrick has a okay so but so so ronna patrick has a response to this or at least in her response to this or at least in her review about this she has a response review about this she has a response her view is called sauna use as a her view is called sauna use as a lifestyle practice to extend lifespan lifestyle practice to extend lifespan and she writes she writes similarly whereas reverse causation bias
similarly whereas reverse causation bias figures prominently in observational figures prominently in observational studies and is a valid concern when studies and is a valid concern when investigating links between investigating links between cardiovascular disease and lifestyle cardiovascular disease and lifestyle the kihd the kihd findings this is the study the original findings this is the study the original study we were talking about were study we were talking about were adjusted for potential biases including adjusted for potential biases including lifestyle factors such as socioeconomic lifestyle factors such as socioeconomic status physical activity and cardio status physical activity and cardio respiratory fitness so it's just respiratory fitness so it's just confusing because the original confusing because the original commentary says simple adjustment for commentary says simple adjustment for disease versus no disease may not disease versus no disease may not entirely solve this problem she's saying entirely solve this problem she's saying well they adjusted for disease versus no well they adjusted for disease versus no disease disease um um but they didn't see a it didn't it didn't it still didn't affect the relationship but what this affect the relationship but what this these guys are saying is you can't these guys are saying is you can't actually adjust away that problem you actually adjust away that problem you have to actually see have to actually see the reduction in risk the reduction in risk uh uh for using the sun among healthy people for using the sun among healthy people and you don't and you don't it doesn't matter how much adjustments it doesn't matter how much adjustments you do you don't see the the reduction you do you don't see the the reduction among healthy people okay cool
among healthy people okay cool so that's like the first thing so this so that's like the first thing so this isn't this criticism is never really isn't this criticism is never really responded to it's just some summarily responded to it's just some summarily dismissed it's somewhere is summarily dismissed it's somewhere is summarily dismissed in this review dismissed in this review so so that's not good science in my opinion that's not good science in my opinion but we'll let's continue on to the next but we'll let's continue on to the next claim so we talk about the mortality claim so we talk about the mortality benefit claim let's talk about the heat benefit claim let's talk about the heat shock protein claim shock protein claim so so kubernetes claims that heat shock kubernetes claims that heat shock proteins are the mediating mechanism by proteins are the mediating mechanism by which sauna reduces um which sauna reduces um mortality and actually this is mortality and actually this is interesting because because ronda does the same thing she says the she says in particular the the risk the she says in particular the the risk of all-cause mortality was 40 lower of all-cause mortality was 40 lower among frequent sun users compared to among frequent sun users compared to infrequent users independent of infrequent users independent of conventional risk factors conventional risk factors so it's basically going to be based on so it's basically going to be based on not not these conventional risk factors but on these conventional risk factors but on stuff like stuff like as we as we pointed out as we as we pointed out um
um heat shock proteins that's that's like heat shock proteins that's that's like the mechanism that these guys are the mechanism that these guys are promoting promoting but what's the problem with he shocked but what's the problem with he shocked proteins is there's no good evidence in proteins is there's no good evidence in the heat shock protein literature that the heat shock protein literature that um this is the case so um this is the case so i'm going to read bronda's paragraph i'm going to read bronda's paragraph and she's got uh it says one of the and she's got uh it says one of the protective protective adaptive mechanisms to heat stress is adaptive mechanisms to heat stress is the increased expression heat shock the increased expression heat shock proteins heat shock proteins comprise a proteins heat shock proteins comprise a large highly conserved family of large highly conserved family of proteins that are present in all cells proteins that are present in all cells heat shock proteins are also present in heat shock proteins are also present in the extracellular environment they play the extracellular environment they play a prominent role in many cellular a prominent role in many cellular processes including immune function cell processes including immune function cell signaling cell cycle regulation and signaling cell cycle regulation and proteome homeostasis proteome homeostasis loss of protein integrity is a hallmark loss of protein integrity is a hallmark of aging process of aging process and intrinsically disorder or damaged and intrinsically disorder or damaged dysfunctional proteins are common dysfunctional proteins are common features and age-related diseases such features and age-related diseases such as cardiovascular disease and as cardiovascular disease and neurodegenerative diseases increased neurodegenerative diseases increased expression of heat shock proteins expression of heat shock proteins prevents protein expression and prevents protein expression and aggregation protein disorder and aggregation protein disorder and aggregation by repairing proteins that aggregation by repairing proteins that have been damaged and animal evidence have been damaged and animal evidence suggests that heat shock proteins may suggests that heat shock proteins may offer protection against
offer protection against neurodegenerative diseases neurodegenerative diseases uh heat shock proteins also moderate uh heat shock proteins also moderate muscle atrophy findings from a small muscle atrophy findings from a small interventional study in rodents interventional study in rodents demonstrated that local heat application demonstrated that local heat application during immobilization decreased muscle during immobilization decreased muscle attribute by 37 percent attribute by 37 percent uh so they there's not a single animal uh so they there's not a single animal model that shows that increased model that shows that increased expression of heat shock proteins expression of heat shock proteins actually causes uh this longevity actually causes uh this longevity phenotype and this leak i don't know i phenotype and this leak i don't know i haven't even looked at haven't even looked at this is it a review this is it a review maybe a review maybe a review it's a review we're not looking at it it's a review we're not looking at it because it's a review because it's a review okay but in any case i what i decided to okay but in any case i what i decided to do is okay do is okay if increased heat shock proteins reduces if increased heat shock proteins reduces mortality if it increases longevity then mortality if it increases longevity then we should see in animal models where you we should see in animal models where you increase the expression of heat shock increase the expression of heat shock proteins you should see a longevity proteins you should see a longevity phenotype because we actually see that phenotype because we actually see that with stuff like autophagy genes if you with stuff like autophagy genes if you increase autophagy expression you're increase autophagy expression you're going to get a longevity phenotype going to get a longevity phenotype sometimes sometimes in these particular cases
in these particular cases for heat shock proteins that's not the for heat shock proteins that's not the case look so over expression of heat case look so over expression of heat shock protein 70 in mice is associated shock protein 70 in mice is associated with growth retardation tumor formation with growth retardation tumor formation and early death this paper showed if you and early death this paper showed if you increase the expression of heat shock increase the expression of heat shock proteins in these mice you actually kill proteins in these mice you actually kill them earlier they die earlier them earlier they die earlier so contrary to what this she says here so contrary to what this she says here heat shock proteins actually cause these heat shock proteins actually cause these animals to die earlier well so that's animals to die earlier well so that's interesting so what does that mean interesting so what does that mean exactly well if you go look at the exactly well if you go look at the heatoc protein if you go look at the heat shock protein literature it's not that heat shock literature it's not that heat shock proteins are like protecting these proteins are like protecting these animals and they're like making sure animals and they're like making sure that they like that they like you know live longer they're actually you know live longer they're actually just preventing proteins from being just preventing proteins from being misfolded they're just an adaptive misfolded they're just an adaptive response to damage response to damage why do you think that just increasing why do you think that just increasing the expression is something that just the expression is something that just responds to damage is necessarily going responds to damage is necessarily going to produce a longevity phenotype and to produce a longevity phenotype and furthermore if you're doing sauna and furthermore if you're doing sauna and you're inducing damage and you need heat you're inducing damage and you need heat shock proteins to compensate for it is
shock proteins to compensate for it is that a good thing that a good thing like how is that a good thing if you're like how is that a good thing if you're inducing damage and you're expressing inducing damage and you're expressing like repair enzymes and stuff you're like repair enzymes and stuff you're causing damage causing damage that would be my way of looking at it as that would be my way of looking at it as far as i can tell far as i can tell okay well so okay well so the only models the animal models that the only models the animal models that we have are we have are showing that he shocked proteins showing that he shocked proteins actually cause a shorter life the only actually cause a shorter life the only human studies that we have are seriously human studies that we have are seriously confounded and these confounding confounded and these confounding problems are basically overlooked problems are basically overlooked they're basically overlooked by rhonda they're basically overlooked by rhonda patrick and huberman whenever they patrick and huberman whenever they interpret the research literature they interpret the research literature they they kind of ignore it there's no they kind of ignore it there's no randomized controlled trial that shows randomized controlled trial that shows that if you assign people to sonoverse that if you assign people to sonoverse not assigning them to sonic they live not assigning them to sonic they live longer there's no literature like that longer there's no literature like that but instead we only have this highly but instead we only have this highly confounded observational literature yet confounded observational literature yet um often these claims are made with this um often these claims are made with this great amount of certainty and and sort great amount of certainty and and sort of almost a zealousness on these of almost a zealousness on these podcasts that are listened to by podcasts that are listened to by millions of people millions of people well
well okay be that as it may so i decided to okay be that as it may so i decided to like fact check the last thing you like fact check the last thing you talked about dinorphin and how dinorphin talked about dinorphin and how dinorphin um um is important for the expression of heat is important for the expression of heat shock proteins so i looked in rhonda shock proteins so i looked in rhonda patrick's review patrick's review and and she says that denorphin is an and and she says that denorphin is an opioid that is generally responsible for opioid that is generally responsible for the sensation of dysphoria a profound the sensation of dysphoria a profound sense of unease or satisfaction sense of unease or satisfaction dinorphin may also mediate the body's dinorphin may also mediate the body's response to heat helping the body to response to heat helping the body to cool heat activates neurons in the cool heat activates neurons in the dorsal lateral peribrachial nucleus the dorsal lateral peribrachial nucleus the expressed dinorphin the activation of expressed dinorphin the activation of this thermosensory pathway elicits heat this thermosensory pathway elicits heat defense responses in which the binding defense responses in which the binding of dinorphone to kappa opioid receptors of dinorphone to kappa opioid receptors triggers cellular events that promote triggers cellular events that promote pain in distress the heat stress caused pain in distress the heat stress caused by sonoma pronounced dynorphin release by sonoma pronounced dynorphin release which may be responsible for the general which may be responsible for the general sense of discomfort experience from heat sense of discomfort experience from heat exposure so kubernetes says that exposure so kubernetes says that dominorfin causes the expression of heat dominorfin causes the expression of heat shock proteins i've never i don't see shock proteins i've never i don't see that anywhere i don't see that anywhere that anywhere i don't see that anywhere here i don't see anywhere in this review here i don't see anywhere in this review that that's the case i googled it i that that's the case i googled it i couldn't find anything i wouldn't pubmed
couldn't find anything i wouldn't pubmed i couldn't find anything i couldn't find anything if it's true that that dinorphin causes if it's true that that dinorphin causes the upregulation heat shock proteins the upregulation heat shock proteins cool but i still couldn't even get this cool but i still couldn't even get this fact to work out but if if it does fact to work out but if if it does that's cool but if it does it's kind of that's cool but if it does it's kind of irrelevant because the human data isn't irrelevant because the human data isn't good there's no good animal data the good there's no good animal data the animal data that we have shows that animal data that we have shows that animals die earlier so why do we peddle animals die earlier so why do we peddle the story it's kind of simple all right the story it's kind of simple all right it's like you say new things you say new it's like you say new things you say new exciting things you make people think exciting things you make people think that they're in the know that they're in the know like i'm learning this new stuff i'm i'm like i'm learning this new stuff i'm i'm i'm in the like cutting edge of what i'm in the like cutting edge of what everything is and then you make everything is and then you make basically making people feel good about basically making people feel good about themselves you're basically flattering themselves you're basically flattering people's egos and so people's egos and so many of these people get many of these people get basically like idolized because they're basically like idolized because they're flattering lay people's egos to make flattering lay people's egos to make them think that they're in the know and them think that they're in the know and they they like they they like they know more than other people or they know more than other people or something about longevity and all this something about longevity and all this stuff but there's no evidence whatsoever stuff but there's no evidence whatsoever that sauna that sauna actually causes these effects and actually causes these effects and in fact there's a new body of literature in fact there's a new body of literature john speakman is is kind of a part of
john speakman is is kind of a part of this he he published a paper i want to this he he published a paper i want to say it was in nature neuroscience or or say it was in nature neuroscience or or maybe it's a nature metabolism what was maybe it's a nature metabolism what was it sorry it was in it was in nature aging and it's called body temperature not and it's called body temperature not metabolic rate metabolic rate modulates lifespan modulates lifespan that's our research highlight let's get that's our research highlight let's get to the actual paper itself sorry my mistake again it's in nature metabolism it's called body temperature metabolism it's called body temperature is a more important modulator of is a more important modulator of lifespan than metabolic rate in two
lifespan than metabolic rate in two small animals and what this study found small animals and what this study found is actually if you keep the animals is actually if you keep the animals hotter over the entire course of their hotter over the entire course of their life life that's not the same as acute that's not the same as acute intermittent heating to be sure it's not intermittent heating to be sure it's not the same as sauna to be sure there's no the same as sauna to be sure there's no question about that but among the question about that but among the evidence that we do have if you keep evidence that we do have if you keep these animals hotter for their entire these animals hotter for their entire life as opposed to cooler they end up life as opposed to cooler they end up dying earlier dying earlier so again we have so again we have multiple different lines of evidence the multiple different lines of evidence the human evidence is not very clear that it human evidence is not very clear that it gets rid of reverse causation the um the gets rid of reverse causation the um the animal evidence of overexpressing heat animal evidence of overexpressing heat shock proteins actually shows a reduced shock proteins actually shows a reduced lifespan the animal evidence of keeping lifespan the animal evidence of keeping animals hot for their entire life shows animals hot for their entire life shows the reduced lifespan whereas if you the reduced lifespan whereas if you would get more heat shock proteins would get more heat shock proteins because they're hot most of the time because they're hot most of the time you'd expect increased you'd expect increased lifespan lifespan and then many of the mechanisms don't and then many of the mechanisms don't even make sense either for example the even make sense either for example the dinorphin mechanism i don't think as dinorphin mechanism i don't think as actually substantiated by the research actually substantiated by the research literature so again the question is why literature so again the question is why are these claims repeatedly stated it's are these claims repeatedly stated it's not a good thing to tell to tell people
not a good thing to tell to tell people things that are not true so this is the things that are not true so this is the the basic position i have on this so the basic position i have on this so i don't know i would like for for things i don't know i would like for for things to be different but but they are what to be different but but they are what they are they are so if you like this video if you like my so if you like this video if you like my debunkings in general my commitment debunkings in general my commitment right now is to do four right now is to do four kind of positive videos quote unquote kind of positive videos quote unquote like four new things that people can like four new things that people can learn about all sorts of different areas learn about all sorts of different areas that i'm interested in to every one like that i'm interested in to every one like debunking video and so i've done my four debunking video and so i've done my four i'm doing my one debunking video and if i'm doing my one debunking video and if you like these debunk videos cool if you you like these debunk videos cool if you like the positive videos as well check like the positive videos as well check those out uh you can find me on those out uh you can find me on instagram tick tock twitter at um kevin instagram tick tock twitter at um kevin and bask avi and nbass you can also find and bask avi and nbass you can also find me patreon at the same thing please me patreon at the same thing please donate because i need the money so donate because i need the money so so you send me the money send me the so you send me the money send me the money send me the money money send me the money um um patreon if you do become a patron uh you patreon if you do become a patron uh you can even can even i'll prioritize your questions of course i'll prioritize your questions of course i try to respond to as many comments as i try to respond to as many comments as i can but i don't always get to
i can but i don't always get to everybody's comment i try to respond to everybody's comment i try to respond to your questions more your questions more um and of course um and of course if you're an upper tier patron you can if you're an upper tier patron you can um you know talk with me once a month um you know talk with me once a month about the various different things i'm about the various different things i'm reading about and thinking about and reading about and thinking about and things that you might want to know more things that you might want to know more about yourself about yourself uh uh so yeah and then check out my website at thedietwars.com check out the diet wars thedietwars.com check out the diet wars dot com dot com slot forward slash support dash me if slot forward slash support dash me if you want to donate directly you want to donate directly as opposed to become a patron as opposed to become a patron if you want to check out the podcast to if you want to check out the podcast to get a the kevin bass show check out get a the kevin bass show check out youtube at cabez philadelphia that's youtube at cabez philadelphia that's going to be my going to be my youtube channel youtube channel and uh yeah so and uh yeah so i hope you enjoyed it like comment i hope you enjoyed it like comment subscribe and subscribe and let me know what i can do better give me let me know what i can do better give me some feedback i would very much some feedback i would very much appreciate the feedback both positive appreciate the feedback both positive and negative and of course i would and negative and of course i would probably prefer positive because i get a
probably prefer positive because i get a lot of negative i think it's just kind lot of negative i think it's just kind of the tendency of the internet but of the tendency of the internet but if i could also get some positive that if i could also get some positive that would be cool too so let me know what would be cool too so let me know what i'm doing right as well as wrong so i'm doing right as well as wrong so uh please do that and then you know uh please do that and then you know check things out check things out um um see you guys in the next episode bye-bye
Transcript auto-generated by YouTube. Verbatim — duplicates intentionally preserved.
Where The Mortality Evidence Gets Fragile
The mortality numbers Bass reviews come from observational research on sauna bathing and fatal cardiovascular and all-cause mortality events. Observational work can reveal important patterns, but it cannot, by itself, prove that one behavior caused the outcome. It shows association; causation requires more restraint.
The central criticism is reverse causation. In simple terms, the people who use saunas more often can already be different from the people who avoid them. Within groups that carry disease, the difference can be especially important because the least healthy people have more reasons to avoid heat.
Bass highlights a commentary arguing that adjustment for disease versus no disease does not fully solve the problem. The concern operates within disease groups. Among people with diabetes, hypertension, or cardiovascular disease, those with milder illness can be more able and more willing to sit in a hot room.
That changes the meaning of the association. Frequent sauna use can become a marker of lower disease severity rather than the cause of lower risk. The ritual then reflects capacity. The person who can enter the heat may already have more reserve.
This does not make the research useless. It makes the interpretation more exacting. Epidemiology can guide attention and generate better questions, but it asks us to notice who is entering the sauna before we decide what the sauna is doing.
The commentary Bass reads makes one point especially important: a stronger finding would show a graded association between sauna frequency and mortality in an initially healthy, cardiorespiratory fit population. According to the criticism, that was not observed. The pattern appeared in people with conditions, not in their healthier counterparts.
Sauna bathing frequency and duration may be associated with just reduced disease severity.
That gap weakens causal confidence. If sauna were acting as a major preventive force, we would expect the clearest signal to appear before disease has already shaped behavior. Instead, the association Bass emphasizes sits where selection can speak loudly.
Rhonda Patrick's review is presented as a response, noting adjustments for lifestyle factors such as socioeconomic status, physical activity, and cardiorespiratory fitness. Bass argues that this answer misses the core critique. Adjustment does not erase the need to see the association where reverse causation is less likely to dominate.
The practical lesson is not to abandon sauna. It is to hold the mortality claim with more care. You can build a heat protocol for recovery, calm, and consistency without converting observational statistics into certainty.
The Heat Shock Protein Story
The next claim moves from population data to cellular repair. Huberman, and Patrick in related writing, present heat shock proteins as a likely explanation for sauna's health effects. The story is appealing because it gives discomfort a purpose and turns heat into a visible signal of adaptation.
Heat shock proteins respond to stress. They help manage damaged or misfolded proteins, support protein integrity, and take part in cellular processes that matter for resilience and recovery. In plain language, they are part of how the body tries to maintain order when heat creates strain.
That does not prove sauna-driven longevity. A stress response can be protective in context, but its presence is not proof of a long-term health benefit. The body often repairs after challenge; repair does not automatically mean the challenge added years to life.
Bass pushes on this exact point. If increased heat shock proteins were the mechanism that lengthened life, animal models that increase their expression should offer strong support. Instead, he cites a paper in which overexpression of heat shock protein 70 in mice was associated with growth retardation, tumor formation, and early death.
That animal result does not map neatly onto a human sauna session. Bass acknowledges that lines of evidence differ. Still, it undermines the simplest version of the claim: more heat shock proteins equals more longevity. Biology is rarely that obedient.
The more grounded reading is narrower. Heat shock proteins show that heat creates enough stress for the body to respond. They can be part of repair and recovery, but they cannot be treated as automatic proof that a sauna protocol will extend life.
This matters because mechanistic language carries authority. When people hear about damaged proteins being repaired, the conclusion can feel complete before the outcome evidence has done its work. A mechanism can explain plausibility. It cannot replace a demonstrated result.
A premium wellness practice does not need inflated certainty. The strongest protocols respect limits. You enter the sauna to practice stillness, tolerate heat with intention, and create a clean recovery boundary in the day. Longevity claims require a different burden.
That burden remains unmet in Bass's review. The human evidence is confounded, the animal evidence cited is not a clean confirmation, and the mechanism is indirect. Heat shock proteins belong in the conversation, but they should not be used as a shortcut to confidence.
They're just an adaptive response to damage.
Dynorphin, Heat, And The Bigger Lesson
The final mechanism is dynorphin, the opioid signal Huberman links to the discomfort of intense heat. In the clip Bass reviews, dynorphin is described as the difficult feeling that arises in high temperatures. That discomfort becomes part of the story about adaptation, endorphin sensitivity, and heat shock protein activation.
Bass cannot find clear support for the specific claim that dynorphin causes heat shock protein expression. Patrick's review, as he reads it, describes dynorphin in relation to heat discomfort and cooling responses. It does not establish the chain Huberman presents.
That distinction is essential for anyone building a deliberate heat ritual. Dynorphin can help explain why heat feels hard and why leaving the sauna can bring relief, calm, or presence. It does not, on the evidence Bass presents, prove that discomfort is the signal of a longevity pathway.
Bass then widens the lens to animal work on body temperature and lifespan. He notes research suggesting that keeping small animals hotter across life shortened lifespan compared with cooler conditions. He is careful that lifelong heat exposure is not the same as intermittent sauna.
That caution matters. The animal work does not disprove sauna benefits, but it also does not support simple heat optimism. When whole-life heat, heat shock protein overexpression, and human observational findings all point in mixed or indirect directions, certainty loses its footing.
The bigger lesson is restraint. A compelling sequence of mechanisms can make a wellness claim feel complete: heat creates discomfort, discomfort triggers dynorphin, dynorphin connects to repair, repair becomes longevity. Bass's review shows why each link needs evidence, not just narrative force.
For Contrast Collective, that does not diminish sauna. It clarifies its place. Sauna can be a recovery sanctuary, a precise pause, and a practice in controlled discomfort. It can support consistency, focus, and a calmer relationship with stress.
What it cannot honestly carry, from this evidence trail, is certainty about sharply reducing mortality. The ritual remains valuable when the claim becomes quieter. Longevity is built through disciplined patterns, clear thinking, and respect for what the evidence can actually hold.
The human data isn't good. There's no good animal data.
