cold exposure is often presented as a test of tolerance. In this conversation with Dr. Jack Kruse, it becomes something more specific: a metabolic signal that asks the body to adapt.
The claims are bold, and some should be held with care. Still, the central idea is useful. Cold is not decoration. Used deliberately, it can sharpen the conversation between hormones, environment, and behavior.
Full transcript from the source video, grouped by timestamp for easier reading.
Hi there Welcome to the Fat burning Man Show I'm your Host AB James and ladies and gentlemen You better buckle Up Because This is the much anticipated interview with Dr Jack Cruz neurosurgeon Guru welling Cave of in We going to Talking somei tos As well As covering How Jack enables miraculous Fat loss and Weight loss and increases in Health You Know Jack himself Lost well Over 100 PS in less than a Year using No exercise so we're going to geek out about Brain Stuff talk about SA stars and other T subjects and have a bit of Fun so without further Let Ja Hey Jack What's Cooking in Nashville spent a lot of Time actually talking to my surgical Team about My Ted Talk Because uh Some of them Wanted to see The Video and then uh i actually started to show them Some of the videos that I've done on several of The patients Who I've used pre-op and Post CT on Yeah and they were Just floored I just did uh
I just had a lady Come In Yesterday that I did A T with and We US weeks ofe c h Yeah and She Came Back to see me She's Only eight Days Out And The incision goes Right through her armit You Know so It's a very Sensitive Area Yeah She on Camera All She took was Two TS In The First Week Je and You Know that all the [__] Going On in theos it amuses me so much you know these guys are mentally masturbating Over rats and Rod and Here i am I prov This [__] on Myself and Now I'm actually using it to Help People and Dude they Just It's Unbelievable What's Going on Out there that Is So Cool Yeah You Know I don't even really Keep up with a lot of that paleo pale nonsense you know i'm Never really on paleo hacks or anything like that I don't know It's a lot of arguing being A Small New hamp Boy You're probably Smart for doing that I have to tell you I mean I told you I not Technology GU bych I have gotten to use you Facebook
Twitter My Blog has grown You Know so much I mean I didn't even realize How much until I Came Home From P FX actually sent me a Personal email and told me that My Blog has More Traffic than his now you No not I didn't know This WoW and cuz You Know he asked me Could He He Start advertising bulletproof Coffee on the S I Said Yeah I Don't give A [__] The Only Place I don't have As Big A following He does is that The T that I'm Taking is actually of What he's doing in terms of biohack Totally bioh doing are Pretty they Pretty Intense You Know People Are Just not Ready for What I'm bringing to the got you to Help People you reviewing Artic on rats All Day On A Blog that Just doesn't Cut it it doesn't I'm sorry You Know It's Funny How many Rabbit holes There are Oh there is and It's Funny Because like a lot of these people Totally Get caught Up in This Little minu which is almost bringing the whole Field backwards rehash these things that Don't
Need to be talked about instead of actually Moving Forward and trying New things and accepting Some of the things that you know we're Never going to know with 100% certainty If This Stuff Works and nothing is Ever going to Work on anyone But like It's obvious that your results are there and it Works at least on some people and You're trying All This awesome Stuff and so I Think you know there's No use arguing about any of This crap well You Know The Funny Thing is they do they continue And I keep giving People you know examples you know through they want Act like Everything you say has to be absolut Spot on otherwise Everything you say is invalidated and I'm like really Is that The samee like I just Saw com today give you Perfect Example One of the What's her name Melissa m he's going to Put theory Out he has to have proof and really If you go Back and Look at Einstein's Paper From 1905 there's not One foote in it Yeah and the reason Why is what what I'm saying to everyone and This is what I think People have a Hard Time with I'm Telling You that I Found A pathway in our Brain that dates all the way Back that None of Us are privy to We haven't known About It and No one's Written About It well How am I going to have a Paper to cite in that Case some degree When You're ahead of the research how can you have The
research support you right That's the way I Look at it But I Guess My sensibilities are Just a Little Bit different than everyone else's And I I know This experiment that I just did with the Ted Talk is really I mean I'm actually surprised Yeah at How freaked Out People Are by This really So what was The resp to the Ted Talk I did Watch it by the way well This is what i was going to actually email you ear today Tell you to Go read Richard Nickol Blog On You have Kurt har and M so He does not want to Come Out and Give me the Stamp of approval Because Right Now I'm the Guy with the Target I'm the bad Guy I'm the Guy ruining paleo You Know and All That But he calls me up out of the Blue Yesterday and He goes If you give me some Lee let me Post This Blog and see What happens the Blog almost got 400 coms and Dude if you read The coms they are incendiary I mean they are unbelievably incendiary so these are This is his following Right so People Who May not have heard of you before like They try to
har Bad B and Richard And I talked About It And I even baed A couple of the coms on my Facebook page I knew that The usual suspects would Come Out Yeah I made A Thread on my Public Facebook page to bait You Know The hook and Dude they All took it hook line ander My And I told Richard You Know I Said Look Just do I told Richard What was and it stopped Him Dead in tracks did He About It no I told Him he's not allowed to talk about it here's The Thing You don't know and I'm going to tell You this Richard out of the Blue happened to Call on January 9 the day of the Epic biohack while was packed I and knew I The was you know you tell People What
He I Said Dude You don't understand I Said Good and Bad publicity is good Because You Know What they're All talking about me It's True it doesn't matter I me if you Look at My Traffic It's [__] ridiculous I mean I've Only been blogging eight months And I mean I'm In The Top 100000 of the world Yeah Yeah that is bonkers That's Just like completely unprecedented well and You Know All I'm doing here I think The Thing that separates Me From everyone else is I'm Not regita papers Yeah My Stuff is this is coming out of my head This is Stuff that I physically don't on me you would Think that People would Stop and say This Dude Lost 157 by rewiring his Brain gut circadian and Cold biology that Alone should give me some credibility But No I'm Crazy well Yeah and That's One of the things that I Wanted to talk to you about today like actually I originally started interviewing People Who had like inspiring Weight loss Stories and Most Pretty actually was One of The First guys on podcast and a Few other People Over 1 like David Garcia And actually I had Richard nikol on also But Most of those people You Know aside From Richard and and Guess to some degree it wasn't Like A paleo Thing it was a Story about inspiration and Fighting on the treadmill and All these things like that not to say that You Know I supp that condone it anything like that inspiring ST Because they're losing
Weight Now yours is completely different you lost like 13 and 11 months then 167 Few months later like That's insanity And you didn't you weren't spending that Time On A treadmill or like ST stap exc One Bit through that whole Thing That's that is to me tell you I haven't really told a lot of people that I'm Telling You that here's and This is Why I Can Say It loudly Now Because I've Laid The Foundation in the CT Series If You realize and I told You this When We were at that picnic MM that A Polar Bear Comes out of the Ground completely shredded with Big muscles After he hibernator Because what he's what He is subjected his biology to is Sleep and Deep Deep Cold that is precisely the path that I used to Lose The Weight The Only Thing i added to the uh the mix was The lepton prescription efficient My own vegus nerve to rewire You Know My hypothalamus so for you which One Came First was it leptin or The Cold well actually they Came Together Because if you understand How I Came to the You Know The Genesis like if you Listen to the Ted Talk I told you I was at the Foot of michelangelo's David Where What inspired me or I should say What was The
Spark of a Flame was I looked Up at Him I standing Behind The statue everyone in front it And I Said The difference between Perfection and my Fat ass And I realized What it was the world that He lived in was radically different than the world I lived and Home I writing Down allas on that This day I even Tell you What happens on my Tri it From that Day for I Came Home WRC I Came with hoin blind myy B I know to Out it there was neural wiring in and Out And I Said You Know This doesn't Make any Sense that We don't have neural wiring Going In and Out I Said there's Got to be a Way To Access This pathway and When I Real it was circ biology then I said I Got to look for Link and When I found wasit I Totally Get On that ST to It's Like You Know I think I told you that My
background As an undergrad at dartmouth was psychological and Brain sciences And actually I just Put Out A Book Yesterday Dude I was going to tell you that When you posted that The Video I didn't know that talented oh thanks thanks Yeah Last Year I played like 250 shows When On Tour I've toured A bunch of times All Over I Have Many separate Lives I'll Send you a Copy My Book to I Think you find it interesting It's about The biological basis of the faculty of Music and and How Brain of musan is From that of the Non I would love to read it Oh to you guys out there It's Free until Friday I'm Not really sure When I'm going to Post This But I just Put that Out and It's Funny Because I actually wrote that A Few years ago Jack and it was When I was deeply entrenched in in the Science of It All and This kind of gets Back to What You're talking about earlier about like How do you cite all the research When You're kind of ahead of the Field so I went and revisited This and basically Put an Intro and or not You necessarily Need All Science it A Gift and We Enjoy and the Thing that I Learn I studying Science that number one neur
that you know What Say I think What After and That's What We Need to be Chasing After that instead of Going backwards and Just trying to research well That's That's Part of What My Ultimate I Guess I would Say my Ultimate Plan I think It's What kind of happened to me at the Foot of that statue kind of
Transcript auto-generated by YouTube. Verbatim — duplicates intentionally preserved.
77 lb reported loss in three months 140 lb reported loss in eleven months Cold the pathway used to drive adaptation
Leptin is one of the body's appetite and energy-status messengers. Kruse frames it as a central signal for whether the body feels resourced, resilient, and metabolically safe.
In plain language, the body does not respond only to calories. It responds to signals. Sleep, temperature, light, food timing, and stress all help tell the system whether to store, spend, repair, or protect.
Cold thermogenesis exposes the body to a controlled environmental stress. That stress can increase alertness, demand heat production, and invite metabolic adaptation.
The felt experience is immediate: sharper breath, clearer attention, and a stronger sense of being present. The deeper work is slower. Consistency teaches the body that discomfort can be met without panic.
One of the most practical themes in the interview is the value of being directionally accurate. A protocol does not need to be theatrical to be useful.
Start where the body can respond well. Short exposure, steady breathing, and repeatable practice matter more than proving endurance.
"The strongest protocol is the one your body can absorb and repeat."
Begin with brief cold exposure and build only when your breathing stays controlled.
Pair cold practice with sleep, nutrition, and morning light rather than treating it as a standalone fix.
Track steadiness, recovery, and appetite before chasing longer sessions.
cold exposure works best as a deliberate signal, not a random shock. Leptin is a useful lens for thinking about energy, appetite, sleep, and metabolic state.
