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Science of Stress, Testosterone & Free Will | Dr. Robert Sapolsky — Whalespan

Content›Video›Science of Stress, Testoster…

Science of Stress, Testosterone & Free Will | Dr. Robert Sapolsky

Andrew Huberman1h 30m · 2021-08-30

Claims Made

141

Claims Supported

108

Support Rate

77%

Support rate

108 of 141 claims supported

108 supported33 partial / not

Claims from this content

85

✓Well SupportedInside Tracker's platform provides actionable protocols to adjust blood markers into ideal ranges for health.✓Well SupportedInside Tracker's platform helps users understand blood test data and provides protocols to adjust numbers into ideal ranges.✓Well SupportedRegenerative agriculture practices benefit the animal, the soil, and the overall ecosystem.✓Well SupportedBelcampo's regenerative agriculture practices result in meat that is higher in nutrients and healthy fats, and is climate positive and carbon negative.Well Supported

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A. Volkovreader

4h

Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

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N. Park

2d

Would love a "what would change this verdict" RSS feed. Sign me up if it exists.

✓

Testosterone amplifies an individual's existing traits, such as sexual arousal, libido, aggressiveness, spontaneous aggression, and reactive aggression.

✓Well SupportedThe D2 to D4 digit ratio is greater in self-reported females than in males, meaning D2 and D4 are more similar in length in females.

✓Well SupportedDopamine is primarily involved in the anticipation of reward and generating motivation for goal-directed behavior.

✓Well SupportedEstrogen is important for libido, brain function, and bone health in both men and women, and levels should be kept as high as possible without negative symptoms.

✓Well SupportedTestosterone can make individuals cocky and impulsive, potentially contributing to miscalculations in risk assessment.

✓Well SupportedIn humans, testosterone can boost status-seeking behaviors, including conspicuous displays of wealth.

✓Well SupportedLab rats will self-administer testosterone to achieve levels that optimize dopamine release.

✕Not SupportedTestosterone does not cause aggression; it lowers the threshold for aggressive behaviors, making them happen more easily and increasing their intensity.

✓Well SupportedDedicating 20-30 minutes daily to a chosen stress management technique accounts for 80% of the benefit for well-being.

✓Well SupportedEstrogen dominance can manifest as relatively high estrogen compared to progesterone, or absolutely high estrogen levels.

◐Partially SupportedAndrew Huberman consumes pasta and rice later in the day or evening to facilitate sleep transition.

◐Partially SupportedThe specific type of meditative or reflective practice chosen for daily stress management is less important than the consistent practice itself.

◐Partially SupportedGnawing on a bar or engaging in displacement aggression can reduce the stress response.

◐Partially SupportedTestosterone powerfully shifts neural circuit function and adjusts amygdala gain.

◐Partially SupportedA sense of control and predictability make stressors less stressful and are protective against negative health outcomes.

◐Partially SupportedThe amygdala has a high concentration of receptors for testosterone.

◐Partially SupportedMen and women should consult physicians regarding testosterone and estrogen replacement to avoid potential long-term problems during periods of insufficient levels.

◐Partially SupportedVoluntary exercise in rats provides benefits, while forced exercise under duress results in severe stress.

◐Partially SupportedDeprivation of testosterone or estrogen during fetal development can prevent the emergence of brain circuits responsible for sexual behavior.

◐Partially SupportedCold showers are a safe and effective method for stress management.

✓Well SupportedPrenatal testosterone exposure significantly impacts brain development, whereas in adulthood, testosterone acts more as a non-signal with limited influence.

◐Partially SupportedFemales generally have sufficient estrogen to trigger aggression, as they typically produce less testosterone relative to estrogen.

◐Partially SupportedActivities involving deliberate aggression, such as contact sports, can increase androgen levels.

◐Partially SupportedWinning competitions can lead to increased testosterone levels in winners and decreased levels in losers.

◐Partially SupportedThe amygdala acts as a checkpoint in determining whether a physiological response is due to excitement or terror.

✕Not SupportedPromoting stress management focused on control to individuals facing severe adversity is counterproductive.

✕Not SupportedThe Women's Health Initiative showed an increased risk of stroke with both estrogen alone and estrogen plus progestin.

◐Partially SupportedThe prefrontal cortex creates situational explanations for negative actions, attributing them to external factors.

◐Partially SupportedHumans can mitigate negative health effects of being low in one social hierarchy by being high-ranking in another.

◐Partially SupportedInterpreting circumstances as good news rather than bad news can reduce the impact of stress.

◐Partially SupportedAfter an early critical period, gonads remain quiescent until puberty, when hormones reactivate previously organized brain circuits to display adult behaviors.

◐Partially SupportedChronic stressors, such as daily traffic jams or an abusive boss, are undeniably in the chronic range and lead to negative outcomes.

◐Partially SupportedIndividual differences in stress response are significant, meaning that what is optimally stimulating for one person may be overwhelming or insufficient for another.

◐Partially SupportedConventionally-raised animals are confined and eat grains, while regenerative farm animals graze on pastures and seasonal grasses.

◐Partially SupportedDecreasing testicle size in crocodiles and declining sperm counts in humans suggest environmental endocrine disruptors are a real issue.

◐Partially SupportedThe second to fourth digit ratio reflects prenatal androgen exposure and predicts adult behavior.

◐Partially SupportedMaintaining high estrogen levels post-menopause in non-human primates is associated with better brain health and reduced risk of dementia and stroke.

◐Partially SupportedTestosterone replacement therapy in aging males can increase energy, alertness, and motivation, and it rapidly increases glucose uptake into skeletal muscle.

◐Partially SupportedTestosterone can decrease cooperation by increasing confidence, leading individuals to believe they can succeed independently.

◐Partially SupportedEstrogen enhances cognition, stimulates neurogenesis in the hippocampus, increases glucose and oxygen delivery, protects against dementia, and decreases inflammatory oxidative damage to blood vessels.

◐Partially SupportedAvoiding social media and news consumption can be freeing and conducive to insightful thinking.

◐Partially SupportedAdministering testosterone to individuals can increase generosity and the performance of random acts of kindness.

◐Partially SupportedThe Challenge Hypothesis of testosterone action posits that testosterone is secreted when status is challenged, promoting behaviors to maintain that status.

◐Partially SupportedWatching a favorite team play a sport can raise testosterone levels due to psychological framing.

◐Partially SupportedAndrew Huberman eats meat about once a day, prioritizing high-quality sources.

◐Partially SupportedIncreasing testosterone levels by 30% in males or females has essentially zero effect on sexual behavior.

◐Partially SupportedDedicating 20 minutes daily to stress management can yield 80% of well-being benefits.

◐Partially SupportedA sense of control is beneficial for mild stressors but detrimental for major stressors.

◐Partially SupportedPhysical practices like exercise, breathing, and hypnosis can help mitigate stress by shifting focus away from rumination.

◐Partially SupportedScheduling an appointment with a mental health professional can improve well-being for individuals with chronic depression.

◐Partially SupportedNegative outcomes in the Women's Health Initiative study with post-menopausal estrogen were likely due to administering it after a significant delay post-menopause.

◐Partially SupportedNeural circuits can change in response to experience, and top-down mechanisms from the prefrontal cortex can shape circuitry.

◐Partially SupportedUnderstanding that change can happen within a mechanistic neurobiological framework increases optimism and resilience to discouragement.

◐Partially SupportedCognitive flexibility allows individuals to influence their physiology by reframing experiences.

◐Partially SupportedOptimal function is achieved at an optimal level of stimulation, with function decreasing at both too little (boredom) and too much (stress) stimulation.

◐Partially SupportedUnderstanding that change is possible without volitional self-change can alter the brain's ability to respond to optimistic stimuli.

◐Partially SupportedThe interpretation of a stressor, rather than the physical expenditure, determines its impact.

◐Partially SupportedConsistent daily practice of 20-30 minutes is required for effective stress management.

◐Partially SupportedThe neurobiological pathways involved in fear conditioning and alertness are conserved across species.

◐Partially SupportedPerception of stimuli by the prefrontal cortex can powerfully influence incoming reality.

◐Partially SupportedForced exercise can have negative health effects; individuals should choose and initiate personally enjoyable stress mitigation techniques.

◐Partially SupportedThe prefrontal cortex acts as a switch for the hypothalamus and amygdala, influencing context and gain control over physiological responses.

◐Partially SupportedPredictive information about stressors is only beneficial within a narrow domain; warnings too close or too far in advance can be detrimental.

◐Partially SupportedThinking about mortality, cold extremities, and blood clotting can activate the sympathetic stress response.

◐Partially SupportedOptimal estrogen replacement involves understanding the types, quantities, and origin (natural vs. synthetic) of estrogens.

◐Partially SupportedScheduling an appointment with a mental health professional can lead to immediate improvements in individuals with untreated chronic depression.

◐Partially SupportedThe effectiveness of a stress management technique depends on individual suitability.

◐Partially SupportedSteroid hormone receptors, when devoid of estrogen binding, can trigger opposing biochemical cascades.

◐Partially SupportedKnowledge can change the brain and influence how individuals think and respond.

◐Partially SupportedMaintaining physiological estrogen levels into post-menopause may offer protective effects against Alzheimer's disease.

◐Partially SupportedStress management techniques like transcendental meditation, mindfulness, exercise, prayer, and gratitude reflection can collectively lower heart rate and cholesterol levels, but must be personally suitable.

◐Partially SupportedIndividuals can benefit from dedicated breathing and shorter rounds of meditation, even if they are not proponents of long meditation sessions.

◐Partially SupportedThe neurobiology of learning and fear conditioning is conserved across species, involving the same signal transduction pathways.

◐Partially SupportedCastration reduces sexual behavior and aggression, but residual behavior is predicted by prior levels, indicating the role of social learning and context over hormones.

◐Partially SupportedIncreasing testosterone by 30% has essentially zero effect on sexual behavior in males or females.

◐Partially SupportedThe female endocrine system is more complex than the male system due to cyclicity.

◐Partially SupportedSudden cessation of estrogen post-menopause followed by attempts to reactivate hormonal pathways can lead to negative health consequences.

◐Partially SupportedTestosterone replacement therapy in aging males can increase energy, sense of presence, alertness, and motivation.

◐Partially SupportedShort-term stress can enhance mental acuity and focus.

◐Partially SupportedThe amygdala's involvement in brain activation biases the interpretation of an experience towards being perceived as adverse.

◐Partially SupportedThe interpretation and perception of an activity, rather than the physical exertion itself, can determine its biological outcomes.