HoldsUp

Huberman Lab · 2025-12-15 · Andrew Huberman (host), Martin Picard

Improve Energy & Longevity by Optimizing Mitochondria | Dr. Martin Picard

82 research-tied claims examined: 4 contradicted 2 overstated 5 context 65 supported 6 unverified

65 Supported by research
0:00:10Martin Picardsupportedlow

Hair graying is at least temporarily reversible.

"And I think what we discovered is that hair graying, at least temporarily, is reversible." (said at 0:00:10)

A 2021 study by Martin Picard's group (Rosenberg et al.) quantitatively mapped hair pigmentation patterns across single hair shafts in humans and demonstrated that naturally occurring graying can reverse, with white/gray hair shafts regaining pigmentation across various ages, sexes, ethnicities, and body sites, frequently corresponding with periods of stress reduction. Because this is an observational cohort study mapping individual hair shafts with mathematical modeling, the certainty of evidence is low, but it directly demonstrates and supports the exact claim.

0:01:07Martin Picardsupportedmoderate

Genetic inheritance accounts for no more than 10% (around 7%) of human lifespan, with about 90% driven by non-genetic factors.

"Because it's very clear that there's no more than 10% of how long you live that's genetically driven. Like the best studies put this at around 7%. 7% of longevity is genetically inherited maybe, and then about 90% is not." (said at 0:01:07)

The claim accurately reflects findings from a landmark pedigree study of over 400 million historical individuals (Ruby et al., 2018, PMID: 30401766). While traditional twin studies historically reported narrow-sense heritability of lifespan at roughly 15–30%, Ruby et al. demonstrated that these estimates were inflated by assortative mating and shared nongenetic environments. Once assortative mating was accounted for, the estimated heritability of human longevity fell to well below 10% (approximately 7%), leaving ~90% or more explained by environmental and non-genetic factors.

0:20:05Martin Picardsupportedvery low

In genetically identical mice, differences in mitochondrial energetics account for approximately half of inter-individual differences in anxiety-like behavior.

"For example, in genetically identical mice, right, there are mice that all have the same genome, and some are like very anxious and some are super chill. It can't be encoded in the genes somehow. We found recently that's actually there are differences in mitochondria, and part of the reason why these animals behaviorally are different, maybe half of what half of the variance, half of like the inter-individual differences—what makes one mouse super chill and the other, the brother, the sister that is genetically identical, very anxious—has to do with energetics in some way." (said at 0:20:05)

A 2023 study by Martin Picard's research group evaluated mitochondrial respiratory chain enzyme activities and mtDNA content across 17 brain regions in mice. They identified a cortico-striatal mitochondrial network where variations in mitochondrial functional capacity correlated with and accounted for up to 50% of inter-individual (animal-to-animal) differences in anxiety- and stress-related behaviors. Because this evidence is derived from preclinical, cross-sectional animal data, the certainty is graded as very low.

0:28:47Martin Picardsupportedhigh

Human mitochondrial DNA is 100% maternally inherited, and published claims of paternal mitochondrial inheritance were due to sequencing artifacts.

"and the mitochondria have their own genetic material. We all have our mom's mitochondria, which is really beautiful... And there were a few papers a few years ago that said, 'Oh, no, look here. There's this like this one case, this one kid or this, you know, these two kids that have paternal, you know, father mitochondria.' Turns out it was like a mistake in the sequencing." (said at 0:28:47)

Human mitochondrial DNA (mtDNA) is strictly maternally inherited. Although a prominent 2018 study (Luo et al., PNAS) reported biparental mtDNA transmission in several families, subsequent comprehensive re-analyses showed that these findings were methodological and sequencing artifacts. Specifically, large nuclear insertions of mitochondrial DNA (mega-NUMTs) in the autosomal genome were unintentionally co-amplified and sequenced, mimicking apparent paternal mtDNA heteroplasmy and biparental inheritance.

0:29:45Martin Picardsupportedmoderate

The heritability of human longevity shows stronger maternal transmission than paternal transmission.

"Turns out the heritability of longevity is more maternal than paternal." (said at 0:29:45)

Large-scale genealogical and longevity cohort studies demonstrate that human longevity exhibits stronger maternal transmission compared to paternal transmission. For example, in the Leiden Longevity Study, offspring of long-lived mothers had significantly lower mortality than offspring of long-lived fathers. Furthermore, extended pedigree analysis of over 176 million kinship links in the Utah Population Database revealed that matrilineal relatives were significantly more concordant in exceptional longevity than non-maternal relatives, reflecting the contribution of maternally inherited mitochondrial DNA alongside nuclear inheritance.

0:31:45Martin Picardsupportedmoderate

A human egg contains approximately half a million mitochondria.

"the egg that the mother carries and, you know, releases from the ovary, there's about half a million uh mitochondria in that egg." (said at 0:31:45)

Human mature oocytes contain the highest mitochondrial count of any mammalian cell type, typically estimated in the literature to range from 100,000 to over 500,000 mitochondria (and mitochondrial DNA copies, generally organized at 1–2 mtDNA copies per organelle). The speaker's estimate of 'approximately half a million' falls well within the standard range established in mammalian reproductive biology.

0:34:15Martin Picardsupportedmoderate

Subsarcolemmal and interfibrillar mitochondria in skeletal muscle have different proteomic compositions, morphologies, rates of ATP synthesis, ROS production, and calcium handling capacities.

"subsarcolemmal mitochondria and interfibrillar mitochondria, two populations. Their proteome is different, their their molecular composition of those different types of mitochondria are different. Their functions, ATP synthesis, reactive oxygen species production, their ability to handle calcium and release calcium is different. Their morphology is very different." (said at 0:34:15)

Extensive muscle physiology and biochemical research demonstrates that subsarcolemmal mitochondria (SSM, located beneath the plasma membrane) and interfibrillar mitochondria (IFM, located between myofibrils) represent distinct subpopulations. Published studies show clear differences in their morphological dimensions and connectivity, proteomic/biochemical profiles, oxidative phosphorylation and ATP synthesis rates, reactive oxygen species (ROS) production, and calcium handling properties.

0:42:45Martin Picardsupportedmoderate

Training for a marathon can double the quantity of mitochondria in skeletal muscle.

"Like if you train to run a marathon, for example, you can double the number of mitochondria in your muscles." (said at 0:42:45)

Extensive exercise physiology literature demonstrates that prolonged endurance training (such as marathon preparation or long-distance running) stimulates mitochondrial biogenesis in skeletal muscle. This adaptation leads to substantial increases in mitochondrial volume, number, and oxidative enzyme capacity, with classic endurance training interventions showing up to a twofold (100%) increase in key mitochondrial enzymes and cytochrome c content, and typical short-to-medium-term interventions producing 40% to 50%+ increases in mitochondrial volume density in previously untrained muscle.

0:46:10Martin Picardsupportedmoderate

Scientific data show an inverse relationship between the duration of an endurance athletic event and the maximum metabolic power output sustained per day.

"And there's beautiful data showing that the longer the event, the athletic event, the lower the max output per day." (said at 0:46:10)

Observational and doubly labeled water studies analyzing human endurance events demonstrate that maximal sustained metabolic scope (daily energy expenditure relative to basal metabolic rate) decreases curvilinearly as the duration of the event increases, plateauing around 2.5× to 3× basal metabolic rate for multi-month events.

0:46:30Martin Picardsupportedmoderate

Carrying a human pregnancy for nine months operates at the upper limit of sustained human metabolic expenditure capacity.

"some of the data suggest that when you grow a human being for nine months, you're basically operating at the max of her capacity if you integrate over, you know, a nine-month period." (said at 0:46:30)

The claim accurately reflects findings from research on sustained human energy expenditure (notably Thurber, Pontzer, et al., 2019, *Science Advances*). The study evaluated maximum sustained metabolic scope (SusMS = total energy expenditure / basal metabolic rate) across endurance events and physiological states, establishing an alimentary metabolic ceiling of approximately 2.5× BMR for durations beyond several months. Long-term measurements of metabolic expenditure during pregnancy (~2.2× BMR) fall just below/at this theoretical upper ceiling of sustained metabolic capacity over a 9-month period without catastrophic depletion of body energy stores.

0:50:45Martin Picardsupportedhigh

The digestive process consumes approximately 10% to 15% of a human's daily energy expenditure.

"The orchestration of digestion is pretty expensive. It's like 10-15% of your daily energy budget." (said at 0:50:45)

The speaker's statement accurately reflects established human nutritional physiology. The thermic effect of food (TEF), also called diet-induced thermogenesis (DIT)—representing the energetic cost of ingestion, digestion, absorption, and metabolic processing of nutrients—is broadly established to account for roughly 10% of total daily energy expenditure on a standard mixed diet, typically ranging between 10% and 15% depending on meal composition (with protein eliciting a higher thermic response of 20–30% compared to carbohydrates at 5–10% and fats at 0–3%).

0:55:45Martin Picardsupportedvery low

A Scottish man holds the record for the longest fast at 382 days without eating food, losing approximately 250 pounds.

"The record actually for not eating is from this uh Scottish man: 382 days. ... he lost uh How much he lost? Like 250 lbs, I think." (said at 0:55:45)

A 1973 case report documented a 27-year-old male patient in Dundee, Scotland (Angus Barbieri) who underwent a supervised therapeutic fast lasting 382 days. Over the course of the fast, his weight decreased from 456 lb (207 kg) to 180 lb (82 kg), representing a weight loss of 276 lb (closely matching the speaker's approximation of ~250 lb). As this is a single case report, the GRADE certainty is very low.

0:46:47Martin Picardsupportedmoderate

Pregnancy induces structural remodeling and long-lasting morphological changes in specific areas of the female brain.

"We know certain brain areas grow during pregnancy... and even long-lasting brain changes happen in in the woman's brain." (said at 0:46:47)

Prospective longitudinal neuroimaging studies have confirmed that pregnancy induces substantial, selective structural remodeling and long-lasting morphological changes in the female brain. Hoekzema et al. (2017) demonstrated pronounced gray matter remodeling—primarily selective volume reductions/fine-tuning in regions subserving social cognition—that endured for at least 2 years postpartum and correlated with maternal-infant attachment. Subsequent follow-up studies (e.g., Martinez-Garcia et al., 2021) showed that these structural changes persist up to at least 6 years after parturition. While the primary human gray matter adaptation during pregnancy represents neural pruning/refinement rather than generalized volumetric growth, the core claim that pregnancy drives structural remodeling and long-lasting neuroanatomical changes is well-supported.

0:47:10Martin Picardsupportedhigh

Exercise-induced amenorrhea in female athletes is caused by an overall shortage of available energy budget rather than intrinsic ovarian pathology.

"So this economy of energy between organs is likely what explains if you're a young woman and you exercise a lot, you lose your menses, right, amenorrhea. Then this is not because the the reproductive system is broken or because the ovaries are or are sick or something like that. The best explanation we have is there's a short shortage of energy." (said at 0:47:10)

Exercise-associated menstrual dysfunction (functional hypothalamic amenorrhea), recognized as a core component of the Female Athlete Triad and Relative Energy Deficiency in Sport (RED-S), is caused by low energy availability (energy intake minus exercise energy expenditure relative to fat-free mass) rather than intrinsic pathology or disease of the ovaries or reproductive tract. When energy intake is insufficient to cover both metabolic demands and physical activity, the hypothalamic-pituitary-gonadal axis suppresses gonadotropin-releasing hormone pulsatility to conserve energy, downregulating reproductive function. Controlled experimental studies and consensus statements demonstrate that restoring adequate energy availability restores ovulatory function without requiring reductions in exercise volume.

1:00:58Martin Picardsupportedhigh

The psychological urge and anxiety to breathe during breath-holding is driven by the accumulation of carbon dioxide in the blood.

"And uh so why is that? Like what is that sense of urgency, of anxiety? It's CO2 building up in your blood, right? CO2 is the product that mitochondria release as they transform energy." (said at 1:00:58)

The claim accurately reflects human respiratory physiology. Breath-holding causes carbon dioxide (a byproduct of cellular metabolism) to accumulate in the blood, leading to hypercapnia. This rise in arterial PCO2 stimulates chemoreceptors and generates the sensation of 'air hunger' and the urgent urge to breathe. Experimental human studies show that hypercapnia directly reproduces this urge even in completely paralyzed subjects, while individuals lacking chemosensory ventilatory response to CO2 do not experience the urge or respiratory distress during breath-holding.

1:06:25Martin Picardsupportedmoderate

Having higher mitochondrial content in skeletal muscle does not correlate with having higher mitochondrial content in other organs such as the brain, heart, liver, or skin.

"we tested the hypothesis that if you have more mitochondria in your muscles, you also have more in your brain and then your heart and then your liver and then your skin. And the result is that's not the case." (said at 1:06:25)

A multi-tissue study evaluating mitochondrial DNA copy number, oxidative phosphorylation capacity, and mitochondrial gene expression across up to 22 mouse tissues and 45 human postmortem tissues (from 948 individuals in the GTEx project) specifically tested this hypothesis. The authors found that mitochondrial density, capacity, and mtDNA copy number lacked coherence across different tissue types within individuals (median correlation r = -0.01 to 0.16 in mice; r = 0.01 between brain-body tissue pairs in humans). Having high mitochondrial content in muscle does not indicate high content in other organs such as the brain, heart, liver, or skin.

  • supports: Brain-body mitochondrial distribution patterns lack coherence and point to tissue-specific… (Life metabolism 2025) · cited 4x in the literature
    "Across up to 22 mouse tissues, neither mitochondrial OxPhos capacity nor mitochondrial DNA (mtDNA) density was correlated between tissues (median r = -0.01 to 0.16), indicating that animals with high mitochondrial content or capacity in one tissue may have low content or capacity in other tissues. Similarly, RNA sequencing (RNAseq)-based indices of mitochondrial expression across 45 tissues from 948 women and men (genotype-tissue expression [GTEx]) showed only small to moderate coherence between some tissues, such as between brain regions ( r = 0.26), but not between brain-body tissue pairs ( r = 0.01). The mtDNA copy number (mtDNAcn) also lacked coherence across human tissues." (abstract, results)
    pubmedfull study (doi)
1:08:10Martin Picardsupportedlow

Greater psychological well-being and sense of purpose reported before death correlate with higher mitochondrial energy transformation capacity in the dorsolateral prefrontal cortex (DLPFC).

"what she found is that people who felt more purpose in life and who felt more connected to others and who felt, you know, well-being uh for whatever whatever was bringing them well-being, it seemed like that was sufficient to increase the energy transformation capacity of the mitochondria in their brain." (said at 1:08:10)

A 2024 study led by Caroline Trumpff and Martin Picard (PMID 38889126) evaluated longitudinal antemortem psychosocial assessments alongside postmortem dorsolateral prefrontal cortex (DLPFC) proteomics and transcriptomics in older adults. The authors found that higher self-reported psychological well-being was significantly correlated with greater abundance of mitochondrial oxidative phosphorylation (OxPhos) proteins, explaining 18-25% of the variance in complex I abundance. Because the data are from an observational postmortem cohort, the evidence demonstrates correlation rather than proven causation, resulting in low GRADE certainty.

1:09:00Martin Picardsupportedvery low

Directly manipulating mitochondrial function in the rat brain changes social behavior between dominance and submissiveness.

"So if you tweak the mitochondria in a rat brain, you can change the behavior of that animal to from more submissive to more dominant or from more dominant to more submissive. Beautiful work by Carmen Sandi at EPFL in Switzerland that showed this." (said at 1:09:00)

Research from Carmen Sandi's laboratory at EPFL demonstrated that direct pharmacological and genetic manipulation of mitochondrial function in the rat and mouse nucleus accumbens directly alters social hierarchy status. Microinfusion of mitochondrial complex I or II inhibitors into the nucleus accumbens reduced social rank in rats, whereas boosting energy metabolism (via nicotinamide) or overexpressing the mitochondrial fusion protein mitofusin-2 (Mfn2) enhanced social dominance and prevented subordination.

1:09:18Martin Picardsupportedvery low

Chronic stress in animals damages brain mitochondria, reducing mitochondrial density and energy transformation capacity in specific brain areas.

"if you chronically stress animals, you deprive them of kind of freedom of choosing different, you know, options. So chronically stressful things actually damage the mitochondria in the brain. And there in some brain areas there are fewer mitochondria and they don't transform energy as well." (said at 1:09:18)

The speaker accurately describes findings from animal models of chronic stress. In rodent paradigms of chronic stress (such as chronic mild stress or chronic restraint stress) or chronic glucocorticoid exposure, researchers observe structural damage to mitochondria (e.g., cristae disruption/ultrastructural damage) and functional deficits in energy transformation (such as reduced mitochondrial respiration rates, complex I/ETS capacities, ATP production, and dissipated membrane potential) across specific brain regions including the hippocampus, prefrontal cortex, and hypothalamus. Because the claim is based entirely on preclinical animal model evidence, the certainty is graded as very low.

1:15:30Martin Picardsupportedvery low

The developmental pace of mouse versus human cells is controlled by mitochondrial metabolism and regulated by NAD.

"And they found that the main driver of this—and then they did experiments where you can accelerate or decelerate the pace of development by modulating mitochondrial metabolism... And that was regulated by NAD." (said at 1:15:30)

The speaker accurately describes published developmental biology research demonstrating that species-specific differences in developmental tempo (such as between human and mouse cells) are driven by mitochondrial metabolism and cellular respiration. In these experimental models, modulating mitochondrial activity or the NAD+/NADH ratio directly accelerates or decelerates the pace of cellular maturation and developmental oscillations (such as the segmentation clock and cortical neurogenesis). Because the evidence derives from in vitro cellular and animal developmental models, GRADE certainty is rated very low.

1:19:32Andrew Huberman (host)supportedmoderate

Basal metabolic rate does not significantly decrease during young-to-middle adulthood.

"we understand from this paper published in Science a few years ago that basal metabolism doesn't change much as we age. We thought, "Oh, my metabolism slows." It's not true. Once you hit adulthood, once you hit your 20s, your metabolism is not changing much at all, I think as you pointed out, until one's 80s." (said at 1:19:32)

A landmark 2021 study by Pontzer et al. published in Science analyzed energy expenditure using doubly labeled water across 6,400+ individuals aged 8 days to 95 years. The authors found that after adjusting for fat-free mass, daily energy expenditure remains remarkably stable throughout young and middle adulthood (ages 20 to 60 years) before beginning to decline in older adulthood (~60 years and older). While the host colloquially refers to metabolism remaining unchanged 'until one's 80s' (the decline actually begins around age 60), the core claim that basal/adjusted metabolic rate does not significantly decline during young-to-middle adulthood (20s through middle age) is supported.

1:20:25Martin Picardsupportedmoderate

Senescent cells burn energy at a faster rate than non-senescent cells.

"When cells become senescent, they burn energy faster, and then they're sending signals, "I'm struggling energetically speaking."" (said at 1:20:25)

Published cell biology and bioenergetics research, including work by Martin Picard's group and others examining cellular senescence and mitochondrial stress, demonstrates that senescent cells undergo metabolic reprogramming characterized by hypermetabolism. Despite arresting proliferation, senescent cells exhibit markedly increased cellular energy expenditure (burning energy faster via heightened glycolysis and/or mitochondrial oxidative phosphorylation), driven by the energetic demands of maintaining cellular integrity, mitochondrial stress responses, and the synthesis/secretion of the senescence-associated secretory phenotype (SASP; metabokines/cytokines signaling cellular stress).

1:18:33Martin Picardsupportedmoderate

Mitochondrial metabolites such as acetyl-CoA, citrate, lactate, and alpha-ketoglutarate act as messengers to the nucleus that modify the epigenome and alter gene expression.

"There are metabolites that mitochondria are producing based on the energetic state of the mitochondria. There will be more acetyl-CoA and citrate and lactate and alpha-ketoglutarate, and those are all molecular imprints of an energetic state. And then those molecules carry this energetic signature that's in the mitochondria to the nucleus, and then boom, they get written down as the epigenome." (said at 1:18:33)

The speaker's statement accurately describes retrograde mitonuclear signaling. Key TCA cycle and mitochondrial/cellular metabolites—including acetyl-CoA (which acts as a substrate for histone acetyltransferases), citrate (cleaved by ACLY to produce nuclear-cytosolic acetyl-CoA), alpha-ketoglutarate (a required co-substrate for Jumonji C-domain histone demethylases and TET DNA demethylases), and lactate (involved in histone lactylation)—serve as metabolic messengers that regulate chromatin modifications, DNA methylation, and nuclear gene transcription.

1:17:05Andrew Huberman (host)supportedmoderate

Consuming leafy greens and supplementing with N-acetylcysteine (NAC) supports glutathione production and physiological detoxification.

"making an effort to eat more leafy greens and supplementing with NAC, N-acetylcysteine, both of which can support glutathione production and detoxification." (said at 1:17:05)

N-acetylcysteine (NAC) is a well-established precursor that provides rate-limiting cysteine for the synthesis of intracellular glutathione (GSH), which is essential for antioxidant defense and Phase II conjugation/detoxification pathways. Leafy and cruciferous vegetables contain bioactive constituents (such as glucosinolates and isothiocyanates) that induce Phase II detoxification enzymes, particularly glutathione S-transferases (GSTs), which facilitate the conjugation of electrophiles and xenobiotics to glutathione for elimination.

1:35:27Martin Picardsupportedmoderate

IL-6 acts on adipose tissue to stimulate lipolysis and on the liver to stimulate glucose production.

"And then IL-6 goes to your fat, and then it says, "We need energy," like lipolysis. Chop out those lipids that are stored in your fat, release that in the blood, because the liver needs it to make glucose. And then the IL-6 goes to the liver as well, and then tells the liver, "Make glucose, because the muscle is depleted,"" (said at 1:35:27)

During prolonged exercise or muscle glycogen depletion, skeletal muscle secretes interleukin-6 (IL-6) as an endocrine myokine. Human physiological and tracer studies demonstrate that IL-6 acts on adipose tissue to stimulate lipolysis and fat mobilization, and signals to the liver to support hepatic substrate metabolism and glucose output to meet systemic energy demands.

1:35:50Martin Picardsupportedhigh

The post-exercise spike in IL-6 is particularly pronounced when skeletal muscle glycogen stores are depleted.

"And the IL-6 burst after exercise is particularly strong if you're glycogen depleted, right?" (said at 1:35:50)

Direct human physiological studies using muscle biopsies and arterial-femoral venous catheterization consistently demonstrate that skeletal muscle IL-6 mRNA expression and net cytokine release during and following exercise are markedly enhanced when muscle glycogen levels are low or depleted.

1:36:08Martin Picardsupportedhigh

The brain expresses receptors for IL-6.

"The brain has IL-6 receptors as well." (said at 1:36:08)

Receptors for interleukin-6 (IL-6Rα and the signal-transducing subunit gp130) are well-characterized components of the central nervous system. They are expressed on various cell types in the brain, including microglia, oligodendrocytes, astrocytes, and specific neuronal subpopulations (such as preproglucagon neurons in the hindbrain and hypothalamic circuits), mediating both classical membrane-bound signaling and soluble receptor trans-signaling.

1:37:53Martin Picardsupportedhigh

GDF15 is secreted by cells in response to mitochondrial dysfunction or when cellular energy consumption exceeds sustainable levels.

"GDF15, this growth differentiation factor 15, which is a protein, it's a cytokine, it's secreted by cells when energy can't flow properly in mitochondria. So if the cell is burning energy faster than it can sustain, it will start to secrete GDF15." (said at 1:37:53)

The speaker accurately describes Growth Differentiation Factor 15 (GDF15) as a cytokine/protein secreted by cells in response to mitochondrial dysfunction and cellular metabolic/energetic stress. Extensive biomedical literature identifies GDF15 as a stress-induced mitokine/cytokine that is upregulated and secreted downstream of the integrated stress response following mitochondrial respiratory chain impairment, oxidative stress, or unsustainable metabolic demand.

1:38:11Martin Picardsupportedhigh

Cancer patients who develop cachexia exhibit elevated circulating levels of GDF15.

"So people with cancer who end up developing cachexia, right, their muscles melt away, they tend to have very high GDF15." (said at 1:38:11)

Multiple clinical studies, observational cohorts, and clinical trials confirm that circulating levels of growth differentiation factor 15 (GDF15) are significantly elevated in patients with cancer who develop cachexia. Elevated circulating GDF15 drives anorexia and adipose/muscle wasting via central (brainstem GFRAL receptor) and peripheral pathways, and neutralizing GDF15 has been shown in clinical trials to alleviate cachexia symptoms and improve body weight.

1:38:19Martin Picardsupportedhigh

Receptors for GDF15 are localized exclusively in the brain, while GDF15 itself is synthesized by non-brain peripheral tissues and tumors.

"And then GDF15 can go to the brain, and as far as we know, the only place, or as far as the community believes, the only place where there's a receptor for GDF15 is in the brain. But the brain doesn't make GDF15; GDF15 is made by every other organ in the body, including tumors." (said at 1:38:19)

Multiple landmark studies identified GFRAL (GDNF family receptor alpha-like) as the specific, high-affinity receptor for GDF15. Receptor expression is restricted almost exclusively to the hindbrain (specifically the area postrema and nucleus of the solitary tract), whereas GDF15 is produced by various peripheral tissues and organs under cellular stress, as well as by diverse tumors.

1:38:37Martin Picardsupportedvery low

Injecting GDF15 into animals induces vomiting and visceral malaise.

"And if you actually inject GDF15 into an animal to ask what does it do, like what does GDF15 mean if you have a lot of it in your blood, animals actually puke, and it causes an aversive reaction. Visceral malaise is the technical term." (said at 1:38:37)

Animal studies demonstrate that systemic administration of growth differentiation factor 15 (GDF15) triggers emesis in emetic animal models (such as musk shrews) and behaviors indicative of visceral malaise, conditioned aversion, and nausea (such as pica and anorexia) in non-emetic species (such as mice and rats). Because the claim specifically references preclinical animal experiments, the GRADE certainty is rated very low in accordance with guidelines for purely animal evidence.

1:38:58Martin Picardsupportedhigh

GDF15 is the trigger for morning sickness and hyperemesis gravidarum in pregnancy, during which its levels can increase up to 10,000-fold.

"We know now also GDF15 is the trigger for morning sickness in pregnancy. So the reason, you know, women, especially hyperemesis gravidarum, HG, which is terrible—women who have this, many of them want to terminate their pregnancy, it's so horrible. GDF15 rises like 10,000-fold." (said at 1:38:58)

High-quality human genetic, observational, and mechanistic studies (including landmark publications in Nature and Nature Communications) have established that GDF15 (growth differentiation factor 15), largely produced by the feto-placental unit, is a key causative trigger for nausea and vomiting of pregnancy and its severe form, hyperemesis gravidarum (HG). Maternal sensitivity to GDF15 and high circulating levels during pregnancy mediate these symptoms. During normal human pregnancy, circulating maternal GDF15 levels rise dramatically (from basal non-pregnant levels of a few hundred pg/mL up to tens or hundreds of thousands of pg/mL, representing up to several thousand-fold increases).

1:40:51Martin Picardsupportedhigh

GDF15 is significantly elevated in heart failure and dilated cardiomyopathy and serves as a diagnostic/prognostic biomarker in cardiology.

"when the heart struggles, dilated cardiomyopathy or congestive heart failure, energetically it's really demanding for the heart to be pushing against high blood pressure or to be failing, right? So there's an energetic stress in the heart at that point, GDF-15 goes through the roof. So now people know in cardiology GDF-15 is a really good marker of heart failure." (said at 1:40:51)

Substantial evidence from systematic reviews and large meta-analyses confirms that circulating growth differentiation factor 15 (GDF-15) is markedly elevated in heart failure and dilated cardiomyopathy and functions as a robust diagnostic and prognostic biomarker. High GDF-15 levels consistently predict all-cause mortality and heart failure hospitalization across both acute and chronic heart failure presentations, as well as in patients with dilated cardiomyopathy.

1:43:09Martin Picardsupportedmoderate

Human hair graying is naturally and at least temporarily reversible in association with reduced stress.

"And I think what we discovered is that hair graying at least temporarily is reversible. And this was surprising because it goes against this notion that aging is a linear, you know, uh process that just happens over time no matter what you do." (said at 1:43:09)

Martin Picard's laboratory quantitatively demonstrated that human hair greying is naturally and temporarily reversible. By developing high-resolution hair pigmentation pattern (HPP) profiling along individual hair shafts across different sexes, ages, and ethnicities, they showed that grey or white hairs can naturally regain pigmentation. Furthermore, they found that greying and repigmentation transitions correlated longitudinally with periods of increased and reduced psychological stress, respectively.

  • supports: Quantitative mapping of human hair greying and reversal in relation to life stress. (eLife 2021) · cited 62x in the literature
    "Using this method, we show white/grey hairs that naturally regain pigmentation across sex, ethnicities, ages, and body regions, thereby quantitatively defining the reversibility of greying in humans... Combining HPP profiling and proteomics on single hairs, we also report hair greying and reversal that can occur in parallel with psychological stressors. To generalize these observations, we develop a computational simulation, which suggests a threshold-based mechanism for the temporary reversibility of greying." (abstract, results)
    pubmedfull study (doi)
1:44:11Martin Picardsupportedmoderate

Studies indicate that no more than 7% to 10% of human longevity is determined by genetics.

"because it's very clear that there's no more than 10% of how long you live that genetically driven. Like the best studies put this at around 7%. 7% of of longevity is genetically inherited maybe, and then about 90% is not" (said at 1:44:11)

Large-scale genealogical and genomic analyses support the speaker's statement. While earlier classical twin studies estimated the heritability of lifespan at roughly 20% to 30%, a landmark 2018 pedigree study of over 400 million historical individuals (Ruby et al., Genetics) accounted for assortative mating and demonstrated that previous estimates were inflated, concluding that true heritability of human longevity is well below 10% (around 7%). Subsequent genome-wide association studies also confirm that common genetic variation accounts for up to approximately 8% of the variance in lifespan.

1:45:08Martin Picardsupportedhigh

The human genome was sequenced in 2001.

"And then the human genome was sequenced 2001." (said at 1:45:08)

The initial draft sequence of the human genome was completed and published in February 2001 in landmark papers by both the publicly funded International Human Genome Sequencing Consortium (Nature) and Celera Genomics (Science). While subsequent work refined gaps leading to a finished sequence in 2003 and a telomere-to-telomere assembly in 2022, 2001 is the recognized milestone year for the initial sequencing of the human genome.

1:52:40Martin Picardsupportedlow

In a participant study, a two-month period of peak psychological stress precisely corresponded to a 2 cm unpigmented gray segment of hair.

"And her graph looked, you know, exactly like this. And, and that period lasted two months, and it mapped to the gray zone. It it mapped surprisingly perfectly with the with the the graying, right, where the hair lost color. So it was the hair the the stress peaked for two months and then came back down." (said at 1:52:40)

The speaker accurately describes findings from a 2021 study by Rosenberg, Picard, and colleagues published in eLife. The researchers developed high-resolution hair pigmentation pattern (HPP) profiling along single hair shafts and correlated pigmentation changes with longitudinally tracked psychological stress events in human subjects. They demonstrated that periods of elevated psychological stress closely mapped to reversible segments of hair greying (loss of pigment) along the hair shaft, followed by repigmentation when the stress resolved.

1:56:00Martin Picardsupportedhigh

Hair contains high concentrations of mitochondrial DNA, which is what is sequenced in forensic hair analysis.

"Turns out every hair that we walk around with is loaded with mitochondrial DNA. And you know forensic, if you find a hair on a crime scene you can figure out who was there. The DNA that gets sequenced is not the nuclear genome. It's a mitochondrial genome." (said at 1:56:00)

Forensic analysis of naturally shed, rootless hair shafts routinely relies on mitochondrial DNA (mtDNA) sequencing rather than nuclear DNA sequencing. Because human hair shafts contain thousands of copies of the mitochondrial genome per cell but highly degraded and minute amounts of nuclear DNA, mtDNA analysis is the standard method used in forensic investigations to analyze hair evidence.

1:56:31Martin Picardsupportedmoderate

Proteomic analysis reveals that three mitochondrial proteins are consistently upregulated in gray hair compared to pigmented dark hair.

"The signature, the molecular signature that was the most robust comparing the white hair to the dark hair in the same person or comparing white to dark in different people was mitochondrial proteins... and three mitochondrial proteins were consistently upregulated. There was more of the mitochondrial energy transformation machinery in the the gray hair compared to to the dark hair." (said at 1:56:31)

A 2021 study by Picard and colleagues (Rosenberg et al., eLife, PMID: 34155974) used single-hair proteomics to compare white/grey hairs to dark pigmented hairs (both within-person and across individuals). They demonstrated that unpigmented grey hair segments consistently upregulated proteins linked to mitochondria, energy metabolism, and antioxidant defenses compared to pigmented hair segments.

1:58:24Martin Picardsupportedvery low

Complete sleep deprivation causes death in animals.

"And if you sleep deprive a mouse or rat or, you know, an animal, they die eventually." (said at 1:58:24)

Classic laboratory studies by Rechtschaffen and colleagues demonstrated that prolonged total sleep deprivation (using the disk-over-water method with yoked controls) is fatal to rats within approximately 11 to 32 days, accompanied by severe metabolic dysfunction, weight loss despite hyperphagia, and impaired thermoregulation. Because the evidence rests entirely on animal experimental models, the certainty is graded as very low.

1:34:20Andrew Huberman (host)supportedmoderate

Stimulant use, particularly cocaine, is associated with a high incidence of heart failure and premature cardiac death.

"And I think this is why people who use amphetamines and cocaine and things like that, stimulants, we often find that, sure, they die of heart failure. That's very common, actually, in people who use cocaine earlier." (said at 1:34:20)

The host's statement that stimulant use (such as cocaine and amphetamines) is associated with premature heart failure and mortality is well-supported by observational registries and clinical literature. Chronic stimulant use causes direct cardiotoxicity and severe cardiomyopathy (stimulant-associated cardiomyopathy). Registry data (such as the ADHERE-EM study of over 11,000 acute heart failure presentations) show that stimulant users present with acute decompensated heart failure at markedly younger ages (median ~50 vs 76 years) with substantially higher odds of severe left ventricular systolic dysfunction.

2:03:39Martin Picardsupportedhigh

During sleep, heart rate variability increases, parasympathetic tone increases, and the sympathetic nervous system becomes quiet.

"When you sleep, heart rate variability increases, right? Parasympathetic tone increases. Sympathetic nervous system goes very quiet." (said at 2:03:39)

The claim accurately describes the predominant autonomic shifts that occur during normal sleep compared to wakefulness. Non-rapid eye movement (NREM) sleep, which constitutes approximately 75% to 80% of total sleep time, is characterized by marked parasympathetic (vagal) dominance, increased heart rate variability (specifically vagally mediated high-frequency HRV), and sympathetic withdrawal (the sympathetic nervous system becomes quiet). While rapid eye movement (REM) sleep features episodic bursts of sympathetic activation and shifts in autonomic balance, sleep as a whole is characterized by enhanced parasympathetic tone and reduced sympathetic tone relative to wakefulness.

2:04:05Martin Picardsupportedvery low

Expert meditators can enter a deep meditative state where their energy expenditure decreases by 40%.

"there's this beautiful study that shows expert meditators uh can go into, you know, a deep state where their energy expenditure goes down by 40%." (said at 2:04:05)

A classic physiological study by Benson et al. (1990) investigated three advanced Tibetan Buddhist monks and demonstrated that during specific deep meditative practices, resting metabolic rate (measured by oxygen consumption, VO2) decreased by up to 64% (and increased by up to 61% in other practices). While the speaker's claim accurately describes the findings of this published study, the overall certainty of the evidence is very low because it is an uncontrolled case series in only three participants.

2:04:20Martin Picardsupportedmoderate

Sleeping reduces energy expenditure by 10% to 15%.

"So 10 to 15%, we said earlier, that's how much you can save energy by just sleeping." (said at 2:04:20)

Whole-room indirect calorimetry studies consistently show that sleeping metabolic rate (SMR) is approximately 5% to 15% lower than waking basal metabolic rate (BMR) or resting energy expenditure during quiet wakefulness. During sleep, energy expenditure decreases across deeper non-REM sleep stages (stage 2 and slow-wave sleep) and reaches its nadir during the early-to-middle sleep period.

2:07:34Martin Picardsupportedlow

Exposing cultured human cells to glucocorticoids or norepinephrine increases their energetic metabolic rate by approximately 60%.

"You give cells glucocorticoids, like a cortisol mimetic, or norepinephrine, and then we wanted to know how much energy does it cost, right, to mount a stress response? Like, those hormones are not damaging by themselves, but if you give them to cells, those cells go into like a whole choreographed response... And we found it was about 60%." (said at 2:07:34)

The speaker is accurately describing findings from their laboratory published in 2023 (Bobba-Alves et al., PMID 37423094). In that study, longitudinally profiling primary human fibroblasts exposed to chronic glucocorticoid treatment demonstrated that stress hormone exposure increased cellular energy expenditure by approximately 60% (accompanied by a shift toward oxidative phosphorylation and accelerated cellular aging markers). As an in vitro study on cultured human cells, certainty for whole-body physiological translation is graded low.

2:09:25Martin Picardsupportedmoderate

GDF-15 is the best biomarker of mitochondrial disease.

"The best biomarker of mitochondrial disease is actually GDF-15, which, you know, tells us something about what GDF-15 means to the organism." (said at 2:09:25)

Comparative reviews and clinical evaluation studies identify growth differentiation factor 15 (GDF-15), alongside fibroblast growth factor 21 (FGF-21), as the highest-performing circulating biomarkers for mitochondrial disorders, significantly outperforming traditional markers such as blood lactate, pyruvate, and creatine kinase. Some studies note that GDF-15 can also be elevated in non-mitochondrial conditions (e.g., renal or cardiovascular disease) or that FGF-21 may offer superior specificity in certain pediatric cohorts, but GDF-15 is widely recognized in comparative literature as having the greatest diagnostic sensitivity and utility for screening mitochondrial diseases.

2:05:36Martin Picardsupportedmoderate

Excessive endurance training can decrease testosterone levels and impair reproductive function in young, healthy males.

"Like, if you exercise too much and you're a young, healthy male, you can actually decrease testosterone level, right? Like, endurance training can shut down your testosterone production, your reproductive system, basically." (said at 2:05:36)

Substantial clinical and sports endocrinology research documents the 'Exercise-Hypogonadal Male Condition' (EHMC) and Relative Energy Deficiency in Sport (RED-S). Chronic, high-volume endurance exercise training in men—often interacting with low energy availability—can suppress the hypothalamic-pituitary-gonadal (HPG) axis, leading to significantly lower resting basal free and total testosterone levels and potential impairment of spermatogenesis and sexual function.

2:02:21Martin Picardsupportedhigh

Exposure to microgravity in spaceflight leads to bone demineralization, muscle atrophy, and cardiovascular deconditioning.

"Same thing if you send an astronaut in outer space, their body gets like so weak, their bones like demineralize and their muscles atrophy and, you know, their hearts weaken, and then they come back onto onto Earth and then they struggle." (said at 2:02:21)

Spaceflight and microgravity exposure are well documented to cause skeletal unloading, muscle disuse, and fluid redistribution, resulting in progressive bone demineralization (especially in weight-bearing bones), skeletal muscle atrophy, and cardiovascular deconditioning (including myocardial remodeling and post-flight orthostatic intolerance).

2:35:53Martin Picardsupportedhigh

Clinical trials of SS-31 as a treatment for mitochondrial disease have mostly been negative.

"It was supposed to be a treatment for mitochondrial disease, and mostly the trials have been negative." (said at 2:35:53)

SS-31 (elamipretide) was evaluated across multiple randomized, placebo-controlled clinical trials for primary mitochondrial diseases, including primary mitochondrial myopathy (PMM) and Leber hereditary optic neuropathy (LHON). The pivotal Phase 3 MMPOWER-3 trial (N=218) failed to meet its primary endpoints, showing no statistically significant improvement over placebo in the 6-minute walk test (p=0.69) or fatigue scores (p=0.37). Earlier Phase 2 trials (such as MMPOWER-2 and trials in LHON) also failed to achieve statistical significance on their primary efficacy endpoints.

2:37:26Martin Picardsupportedhigh

Many parts of mitochondria require B vitamins to flow electrons towards oxygen.

"there are many parts of mitochondria that require B vitamins to flow electrons towards oxygen." (said at 2:37:26)

The claim is an accurate description of established mitochondrial biochemistry. In the mitochondrial electron transport chain, multiple complexes and dehydrogenase reactions rely on cofactors derived from B vitamins to transfer electrons that ultimately reduce molecular oxygen to water. Specifically, vitamin B3 (niacin) forms NAD+/NADH, which acts as the primary electron donor for respiratory Complex I, and vitamin B2 (riboflavin) forms flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), which serve as essential redox cofactors within Complex I, Complex II (succinate dehydrogenase), and the electron-transferring flavoprotein system.

2:37:50Martin Picardsupportedhigh

Vitamin B12 deficiency can cause chronic fatigue-like syndromes.

"vitamin B deficiency, different vitamin B's including NAD, right, can really be terrible and people have chronic fatigue-like syndromes from vitamin B12 deficiency, for example." (said at 2:37:50)

Vitamin B12 (cobalamin) deficiency is well established in clinical literature to cause pronounced fatigue, cognitive difficulties ('brain fog'), muscle weakness, depression, and neuropsychiatric symptoms that mimic or present as chronic fatigue-like syndromes. Clinical reviews emphasize that severe or subclinical B12 deficiency often overlaps with and mimics other chronic fatigue-associated conditions, and routinely warrants exclusion during the diagnostic workup for chronic fatigue.

2:40:03Andrew Huberman (host)supportedlow

Methylene blue can intercalate into DNA and possibly cause mutations.

"there are some data that point to the fact that methylene blue can intercalate into DNA and possibly cause some mutations there." (said at 2:40:03)

In vitro and microbiological studies demonstrate that methylene blue is a DNA-intercalating dye capable of binding DNA and inducing genotoxic effects and mutations under certain experimental conditions (such as in repair-deficient bacterial assays and sister-chromatid exchange tests). The host's statement accurately reflects these findings using suitably qualified language.

2:36:53Martin Picardsupportedmoderate

Overconsuming calories increases blood glucose and blood lipids, leading to increased reactive oxygen species and molecular damage.

"When you eat too much, you're putting too much food, too much energy into the system and then the system gets overwhelmed and then that increases blood glucose or, you know, blood lipids. And so the effect this has, we understand it, it pushes electrons onto your poor mitochondria... you just put too much food in the system, it increases the the resistance to energy flow, and then you start to have more dissipative loss, like too much reactive oxygen species and too much, you know, molecular damage can happen." (said at 2:36:53)

The speaker accurately describes a well-established biochemical mechanism in metabolic pathophysiology. Caloric excess and overnutrition lead to elevated circulating glucose and lipids (glucolipotoxicity), overloading the mitochondrial electron transport chain with reducing equivalents (such as NADH). This results in electron leakage, elevated generation of mitochondrial reactive oxygen species (ROS), oxidative stress, and downstream molecular damage to cellular proteins, lipids, and nucleic acids.

2:40:07Martin Picardsupportedlow

Data show that advanced meditators can increase blood flow to a specific part of the brain.

"There's even data showing that uh advanced meditators can increase blood flow in like one uh part of the brain." (said at 2:40:07)

Neuroimaging studies using SPECT, PET, and perfusion fMRI have shown that experienced and advanced meditators exhibit region-specific increases in cerebral blood flow (rCBF) during meditation tasks compared to baseline or non-meditators. Commonly increased regions include the prefrontal cortex, cingulate gyrus, and thalamus. The certainty is low due to small sample sizes characteristic of expert meditator imaging studies.

2:35:53Martin Picardsupportedhigh

Mitochondria synthesize hormones and signaling molecules in addition to generating ATP.

"mitochondria transform energy and make ATP, they make hormones, and they make signals." (said at 2:35:53)

The speaker's statement accurately reflects established cell biology. In addition to generating cellular ATP through oxidative phosphorylation, mitochondria play central roles in steroid hormone biosynthesis (steroidogenesis, including the conversion of cholesterol to pregnenolone and subsequent steps in producing glucocorticoids, mineralocorticoids, and sex steroids) and act as hubs for intracellular and inter-organelle signaling (such as reactive oxygen species, calcium flux, and metabolite signaling).

2:35:53Martin Picardsupportedhigh

The peptide SS-31 was discovered by Hazel Szeto.

"Hazel Szeto, who discovered SS-31. She was presenting at meetings, and so I've seen it now commercialized as, you know, Stealth peptide" (said at 2:35:53)

SS-31 (also known as elamipretide, Bendavia, or MTP-131) is a cell-permeable, mitochondria-targeting tetrapeptide discovered by Dr. Hazel H. Szeto (Weill Cornell Medicine) and Dr. Peter W. Schiller (Clinical Research Institute of Montreal), hence the 'SS' designation (Szeto-Schiller peptides). Dr. Szeto co-founded Stealth Peptides (now Stealth BioTherapeutics) to commercialize SS-31 and related mitochondrial-targeted therapeutics, exactly matching the speaker's statement.

5:03:32Martin Picardsupportedlow

When cultured cells are starved of nutrients in a dish, their mitochondria start to fuse, bad mitochondria are cleared, and new, more efficient mitochondria are generated.

"what we know that the science is if a cell is hungry in the dish, the mitochondria start to fuse, and there's more kind of the social connection between your mitochondria. Maybe it happens inside the body, and then you get rid of the bad mitochondria. You make more new ones that work better, more more efficient." (said at 5:03:32)

Cell biology studies confirm that when cultured cells undergo nutrient starvation, mitochondria undergo unopposed fusion and elongate into interconnected networks (mediated by PKA activation and cytoplasmic retention/down-regulation of the pro-fission GTPase Drp1). These elongated, fused networks are protected from non-specific autophagic degradation, maintain cristae structure, increase ATP synthase dimerization/activity, and optimize energy production during starvation while damaged or dysfunctional fragments are targeted for mitophagy. The speaker explicitly frames this as an in vitro observation in a dish ('if a cell is hungry in the dish... maybe it happens inside the body'). Evidence is derived from in vitro and animal models.

5:04:50Martin Picardsupportedmoderate

A piece published in Nature Reviews Cardiology discussed Transcendental Meditation as a potential treatment to aid cardiac recovery and treat cardiovascular disease.

"And just yesterday there was a piece published in Nature Reviews Cardiology about Transcendental Meditation. I think the that shows that the world is changing. You know, a clinical medical journal like Nature Reviews Cardiology saying maybe there's something about like calming down the body, right? And not only is this like calming down the mind, sure, like maybe it it improves well-being, this could actually be a treatment to help the heart recover, right? And to help treat a very serious, um you know, life-threatening disease, cardiovascular disease." (said at 5:04:50)

A review article entitled 'Transcendental Meditation to combat psychosocial stress, hypertension and cardiovascular disease' was published in Nature Reviews Cardiology (PMID: 41266880), directly matching the speaker's description of a piece in that journal discussing Transcendental Meditation in the context of cardiovascular disease and cardiac recovery.

5:07:36Martin Picardsupportedvery low

Studies in cultured cells and animal models show that urolithin A improves mitochondrial quality.

"There's some good data uh on urolithin A um that improves quality in cultured cells and then in animals." (said at 5:07:36)

Preclinical studies demonstrate that urolithin A stimulates mitophagy and enhances mitochondrial quality control in both cultured cells and animal models (such as C. elegans and rodents). For example, landmark research demonstrated that urolithin A induces mitophagy in vitro and in vivo, prevents the buildup of dysfunctional mitochondria, and improves muscle function in aging rodents. Because the available evidence supporting the speaker's claim comes entirely from cell culture and animal models, the GRADE certainty is rated as very low.

5:07:50Martin Picardsupportedmoderate

Compelling scientific data links sperm mitochondrial DNA content per sperm to infertility.

"And I think I saw recently some very compelling data on sperm mitochondrial DNA uh content, mitochondrial DNA content like per sperm, um linked to infertility." (said at 5:07:50)

A robust body of observational and clinical studies demonstrates that sperm mitochondrial DNA copy number (mtDNA content per sperm) is significantly associated with semen quality and male fertility. Systematic evidence indicates that elevated sperm mtDNA copy number is consistently associated with impaired sperm concentration, motility, and morphology, as well as prolonged time-to-pregnancy and reduced fertilization success in assisted reproductive technologies.

5:08:05Martin Picardsupportedhigh

Society is currently experiencing a massive drop in fertility and birth rates are well below replacement level.

"Uh so I suspect that this massive crash, which is really worrying, in fertility um We're well below replacement right now. We're having very few babies as a as a society." (said at 5:08:05)

Comprehensive global demographic analyses confirm that fertility rates have experienced a massive decline over recent decades and that birth rates in many societies, including over half of all countries worldwide and nearly all developed nations, are now well below the replacement level of approximately 2.1 births per woman. Global Burden of Disease (GBD) data show that the global total fertility rate (TFR) decreased by roughly 50% between 1950 and 2021, with projections indicating that the vast majority of countries will remain below replacement level.

5:09:41Martin Picardsupportedhigh

Mitochondria contain iron-sulfur clusters that are paramagnetic and can physically interact with magnetic fields.

"in the mitochondria there's a bunch of iron, you know, iron-sulfur clusters which uh some of them at least are paramagnetic, meaning they interact with magnetic fields." (said at 5:09:41)

The speaker's statement is accurate based on fundamental biophysics and mitochondrial biochemistry. Mitochondria contain numerous iron-sulfur (Fe-S) clusters (for example, in respiratory complexes I, II, and III, and aconitase). In specific oxidation/reduction states, these clusters possess unpaired electron spins, making them paramagnetic (and detectable via Electron Paramagnetic Resonance, EPR, or paramagnetic NMR), meaning they inherently interact with applied magnetic fields.

5:10:05Martin Picardsupportedlow

Laboratory data shows that applying magnetic fields of varying strengths affects mitochondrial respiration and oxygen consumption.

"I know some data where people have measured mitochondrial respiration, right, which is flowing electrons to oxygen and you see oxygen disappearing. So you can measure this very well in the lab, and then you can measure this in the absence of any magnetic field, and then with a bit of a field, a stronger field, a stronger field, stronger field. Uh and it seems like there's there's there's an effect uh on this one function of mitochondria which is uh respiration." (said at 5:10:05)

Laboratory and in vitro studies confirm that applying magnetic fields of varying field strengths modulates mitochondrial respiration and oxygen consumption. For example, experimental studies on isolated rat heart mitochondria demonstrated a bell-shaped increase in State 3 respiration across a range of static low magnetic field strengths (from ~0.27 mT to ~1.9 mT), while other studies show field-dependent modulation or disruption of electron transport chain activity and oxygen consumption in isolated mitochondria and cell cultures.

5:09:00Andrew Huberman (host)supportedlow

Meta-analytic evidence indicates that exposure to electromagnetic fields can adversely impact sperm motility.

"I did an episode on fertility where I reviewed a meta-analysis of data showing that indeed uh sperm motility can be impacted." (said at 5:09:00)

Multiple meta-analyses have evaluated the association between radiofrequency electromagnetic wave exposure (such as from mobile phone usage) and semen parameters. An updated 2021 meta-analysis of 18 studies (4,280 samples) found that mobile phone exposure was associated with reduced sperm motility, viability, and concentration across in vitro and in vivo studies (Kim et al., 2021). Earlier meta-analyses (e.g., Adams et al., 2014) similarly demonstrated detrimental effects on sperm motility in experimental in vitro and animal models. However, overall certainty is low because observational human studies suffer from high risk of bias, confounding, and exposure misclassification, with recent WHO systematic reviews noting substantial uncertainty in human observational data.

5:06:41Andrew Huberman (host)supportedmoderate

Mitochondrial genes and function are involved in meiotic spindle formation and embryo development.

"This makes sense because the mitochondrial genes are involved in the spindle and the formation of the embryo, etc." (said at 5:06:41)

Mitochondria and mitochondrial genes play critical roles in oocyte maturation, meiotic spindle assembly/integrity, chromosome segregation, and early embryo development. Mitochondrial dysfunction leads to ATP depletion, oxidative stress, and calcium dysregulation, which directly causes meiotic spindle abnormalities, aneuploidy, and impaired embryonic developmental competence.

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.