17 Supported by research
Chronic stress response accelerates DNA aging and brain aging.
"I recently have been talking about some of the negative effects of the stress and the stress, the chronic stress response, and how that literally ages your DNA. It ages your brain." (said at 0:02:00)
A substantial body of observational, longitudinal, and mechanistic research demonstrates that chronic psychological stress and dysregulation of the physiological stress response (such as elevated cortisol) accelerate markers of cellular and DNA aging—including telomere shortening and accelerated DNA methylation (epigenetic) age—as well as structural brain changes associated with aging, such as hippocampal volume loss. A meta-analysis of 22 studies (n=8,948) confirmed a statistically significant relationship between higher perceived psychological stress and shorter telomere length, with stronger effects observed in individuals undergoing chronic stress exposure. Furthermore, elevated diurnal cortisol output has been shown to correlate directly with accelerated epigenetic DNA aging and subsequent reductions in hippocampal volume.
- supports: Perceived stress and telomere length: A systematic review, meta-analysis, and methodologic… (Brain, behavior, and immunity 2016) · cited 258x in the literature
"Increased PS was associated with a very small decrease in TL (n=8724 total; r=-0.06; 95% CI: -0.10, -0.008; p=0.01; α=0.025), adjusting for age. This relationship was similar between sexes and within studies using validated measures of PS, and marginally (nonsignificantly) stronger among samples recruited for stress exposure (r=-0.13; vs. general samples: b=-0.11; 95% CI: -0.27, 0.01; p=0.05; α=0.013)." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Accelerated DNA methylation age in adolescent girls: associations with elevated diurnal co… (Translational psychiatry 2017) · cited 89x in the literature
"We found that greater diurnal cortisol production was associated with accelerated DNA methylation age, which in turn was associated with reduced left hippocampal volume. Finally, accelerated DNA methylation age significantly mediated the association between diurnal cortisol and left hippocampal volume." (abstract, results, passage verified)
pubmedfull study (doi)
Meditating 20 minutes a day alters the expression of hundreds of genes in the body.
"if you meditate 20 minutes a day, you will change the use of hundreds of genes in your body." (said at 0:05:00)
Published genomic studies investigating daily mind-body practices and meditation (such as the 20-minute daily relaxation response protocol) show significant changes in the expression of hundreds to thousands of genes. In clinical trials evaluating 8-week training protocols in healthy novices as well as long-term practitioners, whole-blood transcriptome profiling identified between 400 and over 1,500 differentially expressed genes. These changes were characterized primarily by the downregulation of pro-inflammatory pathways (such as NF-κB) and the upregulation of pathways involved in mitochondrial energy metabolism, oxidative phosphorylation, and telomere maintenance. However, the overall certainty is low due to small sample sizes in the genomic trials and reliance on peripheral blood cells.
- supports: Genomic counter-stress changes induced by the relaxation response. (PloS one 2008) · cited 247x in the literature
"2209 genes were differentially expressed in group M relative to group N(1) (p<0.05) and 1561 genes in group N(2) compared to group N(1) (p<0.05). Importantly, 433 (p<10(-10)) of 2209 and 1561 differentially expressed genes were shared among long-term (M) and short-term practitioners (N(2))." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Relaxation response induces temporal transcriptome changes in energy metabolism, insulin s… (PloS one 2013) · cited 317x in the literature
"Both short-term and long-term practitioners evoked significant temporal gene expression changes with greater significance in the latter as compared to novices. RR practice enhanced expression of genes associated with energy metabolism, mitochondrial function, insulin secretion and telomere maintenance, and reduced expression of genes linked to inflammatory response and stress-related pathways." (abstract, results, passage verified)
pubmedfull study (doi) - supports: What Is the Molecular Signature of Mind-Body Interventions? A Systematic Review of Gene Ex… (Frontiers in immunology 2017) · cited 226x in the literature
"Overall, the studies indicate that these practices are associated with a downregulation of nuclear factor kappa B pathway; this is the opposite of the effects of chronic stress on gene expression and suggests that MBI practices may lead to a reduced risk of inflammation-related diseases." (abstract, results, passage verified)
pubmedfull study (doi)
In a breast cancer-susceptible rat strain, social isolation increased tumor incidence from 20% to 80%, enlarged tumor size by 84-fold, and caused metastasis.
"What you see is that the tumor incidence, which at a certain time is 20% in the population, goes to 80. The tumor size is 84 times bigger, and it starts to spread out in the body, metastasize." (said at 0:12:45)
The speaker accurately describes the findings of a preclinical lifespan study in tumor-prone Sprague-Dawley rats (Hermes et al., 2009). The researchers found that female rats subjected to chronic social isolation developed a mammary tumor burden (size/mass) up to 84 times greater than age-matched group-housed controls, alongside significantly higher rates of malignancy and invasive ductal carcinoma. Because these findings are derived from an animal model, the certainty of evidence for direct application to humans is very low.
The transcription factor NF-κB regulates about 200 genes involved in immune response and regulates vascular endothelial growth factor (VEGF).
"a very important protein in DNA regulation is called NF-κB, which is a factor which switches on and off about 200 genes very strongly involved in the immune response, but also responsible for this vascular growth factor." (said at 0:15:05)
Nuclear factor kappa B (NF-κB) is a well-characterized family of inducible transcription factors that regulates the expression of hundreds of target genes central to innate and adaptive immune responses, inflammation, and cell survival. Among its regulated targets is vascular endothelial growth factor (VEGF), an essential promoter of angiogenesis.
- supports: Mollugin Has an Anti-Cancer Therapeutic Effect by Inhibiting TNF-α-Induced NF-κB Activatio… (International journal of molecular sciences 2017) · cited 33x in the literature
"The NF-κB signaling pathway plays a pivotal role in regulating the immune response and inflammation... pretreatment of cells with mollugin prevented the TNF-α-induced expression of NF-κB target genes, such as genes related to proliferation (COX-2, Cyclin D1 and c-Myc), anti-apoptosis (Bcl-2, cIAP-1 and survivin), invasion (MMP-9 and ICAM-1), and angiogenesis (VEGF)." (abstract, results)
pubmedfull study (doi) - supports: The role of Nuclear Factor-kappa B signaling in human cervical cancer. (Critical reviews in oncology/hematology 2017) · cited 275x in the literature
"The Nuclear Factor kappaB (NF-kB) family consists of transcription factors that play a complex and essential role in the regulation of immune responses and inflammation... NF-kB can stimulate transcription of proliferation regulating genes (eg. cyclin D1 and c-myc), genes involved in metastasis, VEGF dependent angiogenesis and cell immortality by telomerase." (abstract, background and results)
pubmedfull study (doi)
A 12-year retrospective study of surgical ward patients found that patients with a window view of trees required less pain medication and had shorter hospital stays than those facing a brick/concrete wall.
"So then he started to analyze for 12 years all the documentation on surgery, the outcome of it, how long and how well did the patient perform. Guess what? The guys who were laying in the room looking at the tree have less pain medication, shorter hospitalization days, were doing better and whatever." (said at 0:18:06)
The speaker accurately describes the findings of Roger Ulrich's landmark 1984 study published in Science. Examining retrospective medical records of cholecystectomy patients from 1972 to 1981 (a 9-year span), the study compared 23 patients assigned to surgical recovery rooms with a window view of trees against 23 matched patients whose windows faced a brick wall. Patients with the natural view had significantly shorter postoperative hospital stays (8.70 days vs. 9.60 days), took fewer potent analgesic pain medications, and had fewer negative evaluative comments in their nursing notes. Because this evidence comes from a single retrospective matched cohort with a small sample size (n = 46 total patients), the overall certainty of evidence is low.
The cortisol receptor complex acts as a transcription factor regulating approximately 20% of the human genome.
"and the complex of cortisol and receptor goes into the nucleus and is called a transcription factor and regulates 20% of our genome. So one in five genes is under control of cortisol." (said at 0:20:30)
Cortisol (the primary endogenous glucocorticoid) binds to the intracellular glucocorticoid receptor (GR). Upon ligand binding, the glucocorticoid-receptor complex translocates into the nucleus where it functions as a ligand-activated transcription factor. Published reviews in human and mammalian endocrinology establish that the glucocorticoid receptor directly or indirectly influences the transcriptional rate of up to approximately 10% to 20% of expressed genes in the genome depending on tissue type and cellular context.
Meditation directly lowers circulating levels of the pro-inflammatory cytokine IL-6.
"you can measure this pro-inflammatory cytokines, IL-6 and whatever, and you directly influence IL-6 by meditation. It goes down." (said at 0:26:54)
Multiple meta-analyses of randomized controlled trials (RCTs) confirm that mindfulness-based interventions and meditation practices lead to statistically significant reductions in circulating levels of the pro-inflammatory cytokine interleukin-6 (IL-6), alongside other inflammatory markers such as C-reactive protein (CRP) and TNF-alpha.
- supports: The effect of mindfulness-based interventions on immunity-related biomarkers: a comprehens… (Clinical psychology review 2022) · cited 65x in the literature
"Pooled effect sizes indicated a reduction in C-reactive protein (SMCD = -.14, 95% CI [-.26 - -.01]) and interleukin-6 (SMCD = -.35, 95% CI [-.67 - -.03]), and an increase in CD4+ (SMCD = .09, 95% CI [-.05 - .22]), telomere length (SMCD = .12, 95% CI [.00 - .24]) and telomerase activity (SMCD = .81, 95% CI [.17 - 1.46]) at post-intervention." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Comparative efficacy of psychological interventions on immune biomarkers: A systematic rev… (Brain, behavior, and immunity 2023) · cited 25x in the literature
"Compared with the control conditions, cognitive therapy (d = - 0.95, 95% CI: -1.64 to - 0.27), lifestyle (d = - 0.51, 95% CI: -0.99 to - 0.02), and mindfulness-based (d = - 0.38, 95% CI: -0.66 to - 0.09) interventions were associated with post-treatment reduction of proinflammatory cytokines and markers." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Effectiveness of mindfulness-based interventions on inflammaging: a systematic review and … (Biogerontology 2025) · cited 2x in the literature
"In RCTs, MBIs reduced levels of TNF-α (d ppc = -0.40), IL-6 (d ppc = -0.70), CRP (d ppc = -0.48), and PWV (d ppc = -0.30) while increasing FMD (d ppc = 0.24), TL (d ppc = 0.43) and TA (d ppc = 0.84)." (abstract, results, passage verified)
pubmedfull study (doi)
An eight-week meditation training program in meditation-naive individuals caused structural and functional changes in brain regions, including decreased amygdala size and activity and increased prefrontal cortex activity.
"I remember reading a study where people that had never meditated before were trained to meditate for eight weeks and they had changed like five regions of their brain. They had decreased the amygdala, which is part of the limbic system. They decreased the activity of it and increased parts of the prefrontal cortex." (said at 0:34:39)
Published neuroimaging studies and systematic reviews corroborate the claim that an 8-week mindfulness-based meditation program (such as Mindfulness-Based Stress Reduction, or MBSR) in meditation-naive participants induces structural and functional neuroplastic changes. Landmark longitudinal MRI studies (e.g., Hölzel et al., 2010 and 2011) demonstrated that an 8-week MBSR course in naive participants resulted in structural gray matter changes across multiple brain regions (including the hippocampus, posterior cingulate cortex, and temporo-parietal junction) as well as reductions in amygdala gray matter density correlating with decreased stress. Furthermore, systematic reviews of functional MRI literature confirm that 8-week secular mindfulness training increases activity, volume, and connectivity within the prefrontal cortex while decreasing amygdala functional reactivity to emotional stimuli.
- supports: Stress reduction correlates with structural changes in the amygdala. (Social cognitive and affective neuroscience 2010) · cited 611x in the literature
"Stressed but otherwise healthy individuals (N = 26) participated in an 8-week mindfulness-based stress reduction intervention... Reductions in perceived stress correlated positively with decreases in right basolateral amygdala gray matter density." (abstract, results)
pubmedfull study (doi) - supports: Mindfulness practice leads to increases in regional brain gray matter density. (Psychiatry research 2011) · cited 1911x in the literature
"Anatomical magnetic resonance (MR) images from 16 healthy, meditation-naïve participants were obtained before and after they underwent the 8-week program... Analyses in a priori regions of interest confirmed increases in gray matter concentration within the left hippocampus. Whole brain analyses identified increases in the posterior cingulate cortex, the temporo-parietal junction, and the cerebellum in the MBSR group compared with the controls." (abstract, results)
pubmedfull study (doi) - supports: 8-week Mindfulness Based Stress Reduction induces brain changes similar to traditional lon… (Brain and cognition 2016) · cited 346x in the literature
"The prefrontal cortex, the cingulate cortex, the insula and the hippocampus showed increased activity, connectivity and volume in stressed, anxious and healthy participants. Additionally, the amygdala showed decreased functional activity, improved functional connectivity with the prefrontal cortex, and earlier deactivation after exposure to emotional stimuli." (abstract, results, passage verified)
pubmedfull study (doi)
Normal physiological baseline human blood pH is approximately 7.4.
"In the normal situation, the acid-alkaline balance, which is called pH, the strict balance is pH 7, and our body is 7.4. That is our regular situation." (said at 0:43:00)
Normal baseline arterial blood pH in humans is tightly maintained around 7.40 (typically within a physiological reference range of 7.35 to 7.45).
Wim Hof's specialized breathing technique expels carbon dioxide and elevates blood pH up to 7.7 or 7.8.
"By this breathing technique and pumping out a lot of carbon dioxide and having periods in not breathing, heavy breathing, and well, he can tell people how to do, you change your pH. And now comes a little trick that in his training, that type of breathing raises the pH sometimes to 7.7, 7.8, and for biology that is a lot." (said at 0:43:38)
Controlled experimental research evaluating the Wim Hof method (which combines cyclic hyperventilation with breath retention) demonstrates that the breathing technique causes marked hypocapnia (elimination of carbon dioxide) resulting in acute respiratory alkalosis and profound temporary elevations in blood pH, reaching levels around 7.7. In randomized testing by Kox and colleagues, this intermittent respiratory alkalosis and hypoxia voluntarily triggered a major sympathetic surge, characterized by significant epinephrine release and modulation of innate immune responses.
Cold exposure triggers norepinephrine release, which activates uncoupling protein 1 (UCP1) to uncouple mitochondrial oxidative phosphorylation in brown fat and generate heat.
"UCP1 the uncoupling protein which norepinephrine which is cold releases norepinephrine and that activates uncoupling protein 1 which then uncouples your mitochondria. So your mitochondria usually are sensing you know the electrochemical gradient and when that becomes uncoupled your mitochondria go oh my god I need to make energy so they burning more you know you're basically burning all the energy like you said to uh you know generate heat and to also make energy ATP so you end up burning fat" (said at 0:52:25)
The biological mechanism described is well-established. Cold exposure stimulates the sympathetic nervous system to release norepinephrine, which acts on adrenergic receptors in brown adipose tissue. This signaling activates uncoupling protein 1 (UCP1) in the inner mitochondrial membrane, allowing protons to re-enter the mitochondrial matrix without driving ATP synthase. This uncoupling of oxidative phosphorylation dissipates the electrochemical proton gradient as heat (non-shivering thermogenesis) and accelerates substrate oxidation, including fatty acids.
- supports: Switching on the furnace: Regulation of heat production in brown adipose tissue. (Molecular aspects of medicine 2019) · cited 97x in the literature
"Heat production in BAT depends primarily on the activity of uncoupling protein 1 (UCP1), which decouples transport of protons across the inner mitochondrial membrane from synthesis of ATP. UCP1 and hence heat production of BAT is regulated by many factors. In this paper we discuss the main factors activating UCP1 and increasing heat production. Probably the most well-known activator is the catecholamine norepinephrine (NE) which is released from sympathetic nerve endings and binds to adrenergic receptors that are abundantly expressed on BAT." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Signaling Pathways Regulating Thermogenesis. (Frontiers in endocrinology 2021) · cited 88x in the literature
"brown and brown-like or beige adipocytes utilize fatty acids (FAs) and glucose at a high rate mainly by uncoupling protein 1 (UCP1) action to uncouple mitochondrial proton gradient from ATP synthesis, dissipating energy as heat... Classically, the main signaling pathway known to activate thermogenesis in adipocytes is β 3 -adrenergic signaling, which is activated by norepinephrine in response to cold, leading to activation of the thermogenic program and browning." (abstract, results, passage verified)
pubmedfull study (doi)
A study published in Nature showed that exposing mice to 4°C for 45 minutes significantly upregulated the cold-shock protein RBM3 in the brain at dendritic spines, which mediates synapse regeneration.
"because there was a paper that was published in Nature last January where researchers took mice and exposed them to about 4° C for 45 minutes caused their core body temperature so unlike Wim their core body temperature dropped from you know 98.6 to about 65° F. Um, so very I mean hypothermia almost. But what was very interesting is that they the cold shock there's a a whole class of proteins called cold shock proteins that are activated by the cold. And one of them specifically is in uh the brain and at the dendritic spine region of neurons and it increases dramatically in the cold. And what's really interesting is that what the function of this protein is is RBM3 is to regrow lost synapses." (said at 0:54:40)
A landmark 2015 study published in Nature (Peretti et al.) demonstrated that cooling laboratory mice to induce hypothermia triggers expression of the cold-shock RNA-binding protein RBM3 in the brain (specifically in the hippocampus and synaptic compartments). This induction of RBM3 was found to be critical for the structural plasticity and regeneration/reassembly of synapses upon rewarming, and boosting RBM3 protected against synapse and neuronal loss in mouse models of neurodegenerative disease. Because this is animal and mechanistic laboratory evidence, certainty for human clinical translation remains very low, but the description of the study's findings is accurate.
Hibernating mammals lose 30% to 40% of their neuronal synapses during hibernation and regrow them upon waking via upregulation of the cold-shock gene RBM3.
"So hibernating animals, bears for example, you know, some hibernating rodents, when they go into hibernation, they lose a significant amount of their synapses. I forgot like 30 or 40% or something like that. But when they come out of the hibernation they regrow the synapses that they lost which has huge implications of course for neurodegenerative disease brain aging in general. Uh so this is kind of what instigated the study because they found that what happens is upon hibernation they have this huge increase in this gene in the brain RBM3 and that regulates you know regrowing the synapses." (said at 0:56:11)
Animal and preclinical research supports the claim. In hibernating mammals and artificially cooled rodents, hypothermia triggers substantial disassembly of synaptic contacts, which are rapidly reformed upon rewarming. This reversible structural plasticity is mediated by the upregulation of cold-shock proteins, specifically RNA-binding motif protein 3 (RBM3). When RBM3 expression is knocked down or fails to induce (such as in late-stage neurodegenerative disease models), synaptic regeneration upon rewarming is impaired, whereas boosting RBM3 restores synapse reassembly and confers neuroprotection. Certainty is rated very low because the findings are established in animal models and mechanistic preclinical studies rather than human trials.
- supports: RBM3 mediates structural plasticity and protective effects of cooling in neurodegeneration… (Nature 2015) · cited 258x in the literature
"In hibernating mammals, cooling induces loss of synaptic contacts, which are reformed on rewarming, a form of structural plasticity. We have found that similar changes occur in artificially cooled laboratory rodents. Cooling and hibernation also induce a number of cold-shock proteins in the brain, including the RNA binding protein, RBM3 (ref. 6)... Enhanced expression of RBM3 in the hippocampus prevented this deficit and restored the capacity for synapse reassembly after cooling." (abstract, results, passage verified)
pubmedfull study (doi) - supports: ASO targeting RBM3 temperature-controlled poison exon splicing prevents neurodegeneration … (EMBO molecular medicine 2023) · cited 37x in the literature
"Increasing the expression of the cold-shock protein RBM3 through therapeutic hypothermia is remarkably neuroprotective. However, systemic cooling poses a health risk, strongly limiting its clinical application." (abstract, results, passage verified)
pubmedfull study (doi)
Capsaicin from red peppers binds to thermal receptors sensitive to temperatures around 40°C, triggering physiological mechanisms that reduce core body temperature.
"a compound with a beautiful name in uh the red pepper is binding to one of these family members which senses heat. Not the extreme heat, not 50, but so around 40° C or so around 100 Fahrenheit. What it's doing that the pepper stimulates this receptor. So the receptor thinks you are too hot... Capsaicin is that... specifically that is the the name. But uh the receptor senses, hey, it's hot. And is reducing your body temperature to neutralize the effect of the outside temperature. So you lower your body temperature by spicy food." (said at 0:57:30)
Capsaicin from chili peppers is a well-established agonist of the transient receptor potential vanilloid 1 (TRPV1) channel, a thermal receptor activated by warm to noxious temperatures (~42–43°C). Binding of capsaicin to TRPV1 activates sensory afferents that project to central thermoregulatory circuits, mimicking heat exposure and triggering physiological heat-loss responses (such as cutaneous vasodilation and sweating), which acutely reduces core body temperature.
- supports: Effect of capsaicin on thermoregulation: an update with new aspects. (Temperature (Austin, Tex.) 2015) · cited 93x in the literature
"In mammals, systemic application of capsaicin induces complex heat-loss response characteristic for each species and avoidance of warm environment. Capsaicin activates cutaneous warm receptors and polymodal nociceptors but has no effect on cold receptors or mechanoreceptors." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Oral gavage of capsaicin causes TRPV1-dependent acute hypothermia and TRPV1-independent lo… (Physiology & behavior 2019) · cited 19x in the literature
"Oral gavage of CAP acutely decreased core body temperature and alternatively increased tail surface temperature of wild type (WT) mice, whereas such acute temperature changes were not observed in TRPV1 knockout (KO) animals." (abstract, results, passage verified)
pubmedfull study (doi) - supports: TRPV1 drugs alter core body temperature via central projections of primary afferent sensor… (eLife 2022) · cited 53x in the literature
"TRPV1, a capsaicin- and heat-activated ion channel, is expressed by peripheral nociceptors and has been implicated in various inflammatory and neuropathic pain conditions... selectively eliminating TRPV1 expression in sensory neurons or vSMCs and show that only the former abrogates agonist-induced hypothermia and antagonist-induced hyperthermia." (abstract, results)
pubmedfull study (doi)
Menthol and eucalyptus compounds bind to cold-sensing TRP receptors on the skin, causing local vasodilation and increased blood flow to generate heat after an initial cold sensation.
"The point is that compounds from these plants bind to the cold receptor. So as soon as you rub in your chest it feels cold because you sense cold like the pepper you feel hot but um that temperature receptor is not only making more energy and whatever but changing the blood flow. So the blood flow increases in this area where you put menthol or eucalyptus and you generate heat." (said at 0:58:50)
Menthol and related plant-derived compounds (such as eucalyptol) activate transient receptor potential melastatin 8 (TRPM8) cold receptors on sensory neurons and vascular tissue. In randomized human crossover studies, topical application induces a sensory cooling effect alongside localized cutaneous vasodilation and significantly increased skin blood flow mediated by sensory nerve activation, nitric oxide, and endothelium-derived hyperpolarizing factors.
- supports: Topical menthol increases cutaneous blood flow. (Microvascular research 2016) · cited 48x in the literature
"Menthol, the active ingredient in several topically applied analgesics, activates transient receptor potential melastatin 8 (TRPM8) receptors on sensory nerves and on the vasculature inducing a cooling sensation on the skin... Topically applied menthol, but not ilex, dose-dependently increases blood flow in the cutaneous microvasculature. This increase in blood flow is mediated, in-part by sensory nerves and EDHFs." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Mechanisms and time course of menthol-induced cutaneous vasodilation. (Microvascular research 2017) · cited 50x in the literature
"Menthol induces cutaneous vasodilation in the skin through multiple vasodilator pathways, including NO, EDHF, and sensory nerves." (abstract, conclusions, passage verified)
pubmedfull study (doi) - supports: Menthol-induced activation of TRPM8 receptors increases cutaneous blood flow across the de… (Microvascular research 2022) · cited 9x in the literature
"Topical menthol-based analgesics increase skin blood flow (SkBF) through transient receptor potential melastatin 8 (TRPM8) receptor-dependent activation of sensory nerves and endothelium-derived hyperpolarization factors." (abstract, results, passage verified)
pubmedfull study (doi)
Studies demonstrate that an optimistic versus pessimistic psychological attitude statistically correlates with differences in disease recovery, life expectancy, and disease-free days.
"And there are a lot of studies of people who are optimistic or pessimistic and that really makes a difference statistically in how they cope with diseases, life expectance, the number of days without disease. That is directly related to a positive or negative uh attitude to life." (said at 1:03:30)
Multiple systematic reviews and meta-analyses of prospective observational cohort studies support the claim that dispositional optimism and positive psychological attitudes statistically correlate with lower all-cause mortality, improved survival, and better disease outcomes. A 2019 meta-analysis of 15 cohort studies involving 229,391 participants found that high optimism was significantly associated with a lower risk of all-cause mortality (RR 0.86) and cardiovascular events (RR 0.65). Similarly, a 2023 meta-analysis in cancer patients demonstrated that positive psychological factors, including optimism, were associated with longer survival and lower overall mortality. In patients with established cardiovascular disease, positive psychological constructs have also been systematically linked to reduced rates of rehospitalization and mortality.
- supports: Relationships between positive psychological constructs and health outcomes in patients wi… (International journal of cardiology 2015) · cited 195x in the literature
"An exploratory meta-analysis of 11 studies showed that positive constructs were associated with reduced rates of rehospitalization or mortality in unadjusted (odds ratio=.87; 95% confidence interval [.83, .92]; p<.001) and adjusted analyses (odds ratio=.89; 95% confidence interval [.84, .91]; p<.001); there was little suggestion of publication bias." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Association of Optimism With Cardiovascular Events and All-Cause Mortality: A Systematic R… (JAMA network open 2019) · cited 221x in the literature
"On pooled analysis, optimism was significantly associated with a decreased risk of cardiovascular events (relative risk, 0.65; 95% CI, 0.51-0.78; P < .001), with high heterogeneity in the analysis (I2 = 87.4%). Similarly, optimism was significantly associated with a lower risk of all-cause mortality (relative risk, 0.86; 95% CI, 0.80-0.92; P < .001), with moderate heterogeneity (I2 = 73.2%)." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Happy thus survivor? A systematic review and meta-analysis on the association between canc… (Psycho-oncology 2023) · cited 16x in the literature
"The meta-analysis reveals that positive affect is associated with longer survival (Hazard Ratio [HR] = 0.91; 95% CI [0.86, 0.96], z = -3.58, p < 0.001) and lower mortality (Odd Ratio [OR] = 0.59; 95% CI [0.45, 0.78], z = -3.70, p < 0.001). Sub-group analyses indicated that the main predictors of survival are emotional and physical well-being, optimism, and vitality." (abstract, results, passage verified)
pubmedfull study (doi)
Major histocompatibility complex (MHC) molecules are chopped up and secreted in sweat and other bodily fluids.
"I first of all I had no idea that you uh secreted the major histocompatibility complex. You chopped it up. You chopped them as little and secrete them as uh in in your sweat and other bodily fluids." (said at 1:09:18)
The host's claim that major histocompatibility complex (MHC/HLA) molecules are truncated or broken down and secreted in sweat and other bodily fluids is supported by biochemical studies. Soluble HLA (sHLA) molecules—including truncated and lower molecular mass forms (ranging from ~45 kD down to 21–23 kD)—have been isolated and quantified in human sweat, urine, plasma, and saliva.
- supports: Molecular forms of soluble HLA in body fluids: potential determinants of body odor cues. (Genetica ) · cited 22x in the literature
"This study was aimed at investigating whether sHLA are excreted in human urine, saliva and sweat. In particular examination of the molecular forms in these fluids would give clues to whether break down forms of soluble MHC molecules might participate in shaping behavior. Major bands of 45, 40, and 23 kD were detectable." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Characterization of soluble HLA molecules in sweat and quantitative HLA differences in ser… (Journal of immunogenetics 1990) · cited 42x in the literature
"These results show for the first time that soluble class I peptides are excreted in relatively high concentrations in sweat and possess polymorphic structures identical to those of serum HLA and that serum HLA levels are allotype dependent." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Soluble MHC class I molecules in human body fluids. (Journal of clinical laboratory analysis 1994) · cited 21x in the literature
"Biochemical analysis of affinity purified serum class I molecules revealed a variety of molecules within the molecular weight region of 45 to 21 kD... sHLA were detected and quantitated in serum, plasma, urine, cerebrospinal fluid, and sweat." (abstract, results)
pubmedfull study (doi)
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.