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Chronic Stress, Cortisol, and Longevity: The Biology of Psychological Aging

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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon, Balance Foot & Ankle PLLC · Howell, MI · Updated May 2026

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Chronic psychological stress accelerates biological aging by 9–17 years in the most-stressed populations — measurable by telomere length, epigenetic clocks, and hippocampal volume. Sustained cortisol elevation damages the hippocampus (reversible with 6 weeks of MBSR), erodes telomeres via TERT suppression, and impairs wound healing by suppressing TGF-β, PDGF, and macrophage M1→M2 polarization. HRV biofeedback, breathwork, and adequate sleep are the best-validated stress-longevity interventions.

Chronic Stress, Cortisol, and Longevity: The Biology of Psychological Aging

In 2004, Elissa Epel and Elizabeth Blackburn published a study in Proceedings of the National Academy of Sciences that changed how scientists think about stress and aging. They measured telomere length in two groups of mothers: those caring for a chronically ill child (a recognized extreme psychological stressor) and age-matched controls with healthy children. The caregivers showed dramatically shorter telomeres — equivalent to 9–17 years of accelerated biological aging compared to controls. Those who perceived their stress as highest showed the shortest telomeres. The study was the first direct molecular evidence that subjective psychological experience could leave a measurable biological imprint on the genome.

The mechanism linking stress to biological aging runs primarily through the hypothalamic-pituitary-adrenal (HPA) axis and its primary effector hormone, cortisol. When cortisol is acutely and transiently elevated — the healthy stress response — it mobilizes energy, focuses attention, and suppresses inflammatory processes that would be counterproductive during an immediate threat. When cortisol is chronically elevated — the modern disease state of unresolved psychosocial stress, sleep deprivation, metabolic dysfunction, and social isolation — it does the opposite: it suppresses immune function, erodes hippocampal neurons, promotes visceral adiposity, drives insulin resistance, accelerates telomere shortening, and activates epigenetic aging pathways. Chronic cortisol elevation is not stress resilience — it is accelerated biological aging measured in years.

The HPA Axis: How Psychological Stress Becomes Biological Aging

The hypothalamic-pituitary-adrenal (HPA) axis is the primary neuroendocrine stress response system. In response to perceived threat — psychological, physiological, or immunological — the hypothalamus releases corticotropin-releasing hormone (CRH), which stimulates the anterior pituitary to secrete ACTH (adrenocorticotropic hormone), which drives the adrenal cortex to synthesize and release cortisol. The entire cascade activates within minutes; plasma cortisol peaks 15–30 minutes after a stressor and returns to baseline within 60–90 minutes through negative feedback: cortisol binds glucocorticoid receptors (GR) in the hypothalamus and hippocampus to suppress further CRH release.

In chronic stress, this negative feedback fails. The mechanism is glucocorticoid receptor (GR) downregulation: sustained cortisol exposure reduces GR expression in the hippocampus (by ~40% in chronically stressed animal models), impairing the hippocampal feedback signal that tells the hypothalamus “enough cortisol.” The result is a progressively dysregulated HPA axis that produces elevated basal cortisol, blunted diurnal cortisol rhythm (normally highest within 30 minutes of waking, lowest at midnight), and exaggerated or prolonged cortisol responses to new stressors. This is the cortisol dysregulation pattern seen in PTSD, major depression, burnout syndrome, chronic sleep deprivation, and poorly managed type 2 diabetes — all conditions associated with accelerated aging in epidemiological studies.

Allostatic Load: The Biological Cost of Sustained Stress

Bruce McEwen at Rockefeller University developed the concept of allostatic load — the cumulative biological “wear and tear” from chronic stress response activation — as a framework for understanding how psychosocial stress translates into disease risk. A high allostatic load score (composed of elevated waist-to-hip ratio, blood pressure, triglycerides, glucose, cortisol/DHEA ratio, norepinephrine, IL-6, fibrinogen, and reduced HDL) predicts mortality, cognitive decline, and functional disability more accurately than any single biomarker. MacArthur Study of Successful Aging data (n = 1,189, 10-year follow-up) showed that high allostatic load at baseline was associated with 2-fold higher 10-year all-cause mortality after adjustment for age, sex, and comorbidities.

What makes allostatic load particularly valuable as a concept is that it captures the cumulative effect of multiple sub-threshold stressors: inadequate sleep, diet-driven inflammation, metabolic dysfunction, psychosocial adversity, and physical sedentariness each contribute partial allostatic load increments that summate to disease risk. No single stressor is necessarily catastrophic; the total integrated stress burden across all physiological systems is what predicts aging outcomes. This explains the consistent finding that socioeconomic disadvantage — a compound exposure to multiple simultaneous stressors — produces some of the strongest allostatic load effects, reducing healthy life expectancy by 10–15 years compared to advantaged peers.

HPA AXIS DYSREGULATION PATTERN

The chronically stressed cortisol pattern is: blunted morning cortisol awakening response (CAR), elevated afternoon/evening cortisol, flattened diurnal slope, elevated midnight cortisol, and exaggerated responses to new stressors. This pattern can be measured by salivary cortisol sampling (morning/afternoon/evening/midnight) or estimated by HRV monitoring. A flat or inverted cortisol curve is associated with double the cardiovascular mortality of a normal-slope curve in prospective studies.

Cortisol and the Brain: Hippocampal Atrophy and Cognitive Aging

The hippocampus — the brain region essential for forming new episodic memories, spatial navigation, and HPA axis negative feedback regulation — is uniquely vulnerable to cortisol toxicity. It expresses some of the highest densities of glucocorticoid receptors in the brain, making it exquisitely sensitive to cortisol signals. In acute stress, this sensitivity is adaptive: cortisol consolidates emotionally important memories in the hippocampus and enhances vigilance circuits. In chronic stress, sustained cortisol exposure triggers a cascade of hippocampal damage mechanisms: suppression of BDNF production (reducing synaptic plasticity), reduction of hippocampal neurogenesis (adult hippocampal neurogenesis continues throughout life and is cortisol-sensitive), dendritic retraction of CA3 pyramidal neurons, and eventually apoptosis of granule cells in the dentate gyrus.

MRI studies consistently show that chronic stress and elevated cortisol are associated with smaller hippocampal volumes. A meta-analysis of 47 MRI studies by Gerritsen and colleagues (2011, Neuroscience & Biobehavioral Reviews) found that individuals with chronic stress, PTSD, major depression, or Cushing’s syndrome (pathological hypercortisolism) had hippocampal volumes 5–15% smaller than age-matched controls. The clinical consequence is measurable: smaller hippocampal volume predicts episodic memory performance, risk of developing MCI, and conversion rate from MCI to Alzheimer’s disease. Chronic stress, through cortisol-mediated hippocampal atrophy, is a dementia risk factor — independent of and additive to the vascular and amyloid mechanisms discussed elsewhere in this series.

The critical finding for clinical practice is reversibility. A 2011 RCT by Hölzel and colleagues at Harvard Medical School published in Psychiatry Research: Neuroimaging showed that 8 weeks of Mindfulness-Based Stress Reduction (MBSR) increased gray matter density in the hippocampus by a measurable degree on voxel-based morphometry, alongside reductions in perceived stress and amygdala reactivity. The ability of a behavioral intervention to reverse stress-associated hippocampal atrophy within 8 weeks — a shorter timeline than most pharmaceutical interventions for cognitive protection — has become one of the most compelling arguments for stress reduction as a genuine neurocognitive longevity strategy.

Stress and Telomere Erosion: The Molecular Clock of Psychological Aging

The Epel-Blackburn 2004 caregiver study, discussed in the introduction, established the stress-telomere connection at the population level. The mechanism operates through two converging pathways. First, cortisol directly suppresses TERT expression (telomerase reverse transcriptase, the catalytic component of telomerase) in immune cells and other cycling tissues. Human T-lymphocytes exposed to cortisol at concentrations observed in chronic stress show 40–60% reduction in TERT mRNA within 48 hours — impairing the telomere maintenance mechanism at the cellular level. Second, the oxidative stress component of the chronic stress response accelerates telomere erosion: each cell division shortens telomeres by 50–200 base pairs in the absence of adequate telomerase, and ROS-driven single-strand breaks in G-rich telomeric DNA accelerate this attrition. The combination of suppressed telomerase and elevated oxidative stress produces the telomere shortening rate seen in chronically stressed individuals.

Subsequent studies have quantified the magnitude of stress-related telomere shortening across different stressor types. A 2011 meta-analysis by Mathur and colleagues in Psychosomatic Medicine of 27 studies found that major depression, PTSD, early-life adversity, and caregiver stress were each independently associated with telomere shortening equivalent to 4–11 additional years of biological aging. Childhood adversity (abuse, neglect, parental mental illness) showed the largest effects — suggesting a biological embedding of early-life stress in the telomere biology that persists into adulthood. A 2004 prospective study by Epel and colleagues in Proceedings of the National Academy of Sciences found that women with the highest perceived stress had telomeres 9–17 years shorter than those with the lowest stress — the equivalent of a decade of premature aging from psychological perception alone.

Can Stress-Related Telomere Shortening Be Reversed?

The reversibility of stress-induced telomere shortening is a subject of active investigation. The Ornish trial mentioned in the telomeres article found that comprehensive lifestyle intervention (diet, exercise, stress management, social support) produced +10% telomere length increase after 5 years — but the stress management component was integral to the protocol, making isolated stress effects hard to quantify. A 2014 RCT by Carlson and colleagues published in Cancer examined mindfulness meditation in breast cancer survivors: the 3-month intervention prevented telomere shortening that occurred in the wait-list control group (relative telomere length maintained versus −0.02 units in controls, p=0.05), alongside reduced diurnal cortisol slope flattening. The evidence suggests that stress reduction can slow or partially reverse stress-associated telomere attrition, though the biological timescales are months to years rather than weeks.

Stress and Epigenetic Age Acceleration

As discussed in the epigenetics post, biological age can be estimated by DNA methylation clocks (Horvath, PhenoAge, GrimAge) that predict morbidity and mortality more accurately than chronological age. Chronic psychological stress accelerates epigenetic aging as measured by these clocks — with effects that are magnitude-comparable to heavy smoking or extreme obesity. A 2017 study by Zannas and colleagues in Translational Psychiatry found that higher lifetime stress exposure (operationalized as cumulative trauma and adversity scores) was associated with 1.5–2.0 year acceleration in Horvath epigenetic age per unit increase in stress score, after adjustment for chronological age, sex, BMI, and smoking. Post-traumatic stress disorder specifically accelerated PhenoAge by 3.5 years compared to trauma-exposed controls without PTSD in a Veterans Affairs cohort study.

The cortisol mechanism for epigenetic age acceleration involves glucocorticoid receptor (GR) binding to glucocorticoid response elements (GREs) near CpG sites across the genome. GR activation drives changes in DNMT (DNA methyltransferase) activity at specific loci, adding or removing methylation marks in patterns that correspond to accelerated epigenetic aging signatures. A 2016 study by Heim and colleagues identified a cortisol-responsive methylation pattern at the NR3C1 (GR) gene itself — early-life stress drives methylation of the GR promoter, reducing GR expression in the hippocampus and perpetuating the HPA dysregulation that drives further stress aging in a self-amplifying epigenetic loop.

STRESS AGING QUANTIFICATION

Caregiving stress = 9–17 years of telomere aging. PTSD = 3.5 years epigenetic age acceleration. Cumulative lifetime stress = 1.5–2.0 years epigenetic acceleration per stress unit. These are not metaphors — they are measurable molecular aging rates that explain why chronically stressed individuals develop age-related diseases a decade earlier than their chronological peers. They also explain why stress reduction is a legitimate longevity medicine intervention, not just a wellness amenity.

HRV as the Cortisol Proxy and Intervention Target

Heart rate variability (HRV) — the beat-to-beat variation in cardiac inter-beat intervals — is the most accessible and informative real-time measure of autonomic nervous system balance between sympathetic (stress-activated) and parasympathetic (rest-and-digest) tone. High HRV indicates robust parasympathetic dominance at rest; low HRV indicates chronic sympathetic overdrive — the autonomic signature of cortisol dysregulation, inflammation, poor sleep, overtraining, and psychological stress. A meta-analysis of 27 studies (n = 5,148) published in the International Journal of Environmental Research and Public Health in 2020 found that resting HRV (RMSSD measure) was inversely associated with perceived stress levels, salivary cortisol, and inflammatory biomarkers (CRP, IL-6) — validating HRV as a non-invasive cortisol proxy accessible through consumer wearables (Oura Ring, WHOOP, Garmin, Apple Watch).

HRV biofeedback — a technique in which users breathe at the resonance frequency (approximately 0.1 Hz, corresponding to a 6-second breathing cycle: 5-second inhale, 5-second exhale) that maximally synchronizes cardiac and respiratory rhythms — is one of the most rigorously studied non-pharmaceutical stress interventions. A 2017 meta-analysis of 24 RCTs in Applied Psychophysiology and Biofeedback found that HRV biofeedback reduced anxiety by a standardized mean difference of −0.83 (large effect), reduced depression by −0.69, and improved HRV itself by 1.23 standard deviations — effects comparable to pharmacological anxiolytics without dependence risk, side effects, or prescription requirements. The protocol used in most trials: 5–8 sessions of 20 minutes, with home practice of 5–20 minutes daily.

MBSR, Breathwork, and the Evidence-Based Stress Reversal Toolkit

Mindfulness-Based Stress Reduction (MBSR), the 8-week program developed by Jon Kabat-Zinn at the University of Massachusetts in 1979, has accumulated more high-quality RCT evidence than virtually any other behavioral intervention. A 2014 meta-analysis by Goyal and colleagues in JAMA Internal Medicine of 47 RCTs (n = 3,515) found that mindfulness meditation programs reduced anxiety (effect size 0.38), depression (0.30), and pain (0.33) relative to active controls — effects comparable to antidepressant and anxiolytic pharmacotherapy in mild-to-moderate conditions without adverse effects. For longevity-specific outcomes, Epel and Blackburn’s subsequent 2009 work found that mindfulness retreats increased PBMC (peripheral blood mononuclear cell) telomerase activity by 30% compared to relaxation controls — a direct molecular signal that meditative practice engages the cellular machinery of biological aging.

Physiological Breathwork: The 4-7-8, Box Breathing, and Cyclic Sighing Data

Controlled breathwork techniques reduce cortisol through direct activation of the vagus nerve and the baroreceptor reflex. Slow breathing (4–6 breaths per minute versus the default 12–15) dramatically increases HRV through respiratory sinus arrhythmia amplification and inhibits sympathetic outflow through baroreflex activation. A 2023 RCT by Balban and colleagues at Stanford published in Cell Reports Medicine directly compared four breathwork protocols (box breathing, cyclic hyperventilation with retention, cyclic sighing, and mindful meditation) in a well-controlled crossover design over 5 weeks. Cyclic sighing — a double inhale through the nose followed by a long exhale through the mouth, repeated for 5 minutes — produced the greatest improvement in positive affect, HRV, and respiratory rate reduction of all four conditions, and outperformed mindful meditation as a real-time affect regulator. The mechanism: the double inhale pops collapsed alveoli to maximize lung capacity, and the long exhale maximally activates the baroreceptor reflex to increase vagal tone and reduce sympathetic drive.

Yoga deserves mention as the best-studied combined physical-breathwork-mindfulness intervention for stress and aging. A 2017 meta-analysis in Journal of Clinical Psychology of 42 RCTs found that yoga reduced cortisol by 0.52 standard deviations, reduced inflammation (CRP, IL-6) by 0.47 SD, and improved HRV by 0.43 SD — with effects on physical function, pain reduction, and quality of life additional to the neuroendocrine benefits. For older adults who cannot perform high-intensity exercise, yoga provides a stress-modulating, flexibility-improving, balance-enhancing activity that addresses multiple longevity domains simultaneously.

Clinical Connection: Cortisol, Wound Healing, and Diabetic Stress Hyperglycemia

In podiatric surgery and wound care, stress physiology is not abstract biochemistry — it is an immediate determinant of whether a wound heals or enters chronic non-healing status. Cortisol’s effects on wound healing operate through three primary mechanisms, all of which I observe in the clinical trajectories of stressed versus less-stressed patients with objectively similar wound parameters.

First, cortisol suppresses growth factor production and responsiveness: TGF-β1 (which drives fibroblast proliferation and collagen synthesis), PDGF (which initiates the cellular repair cascade), and VEGF (which drives wound angiogenesis) are all downregulated at both the transcriptional and signaling levels by glucocorticoid receptor activation. A 2011 study by Glaser and Kiecolt-Glaser published in Nature Reviews Immunology documented that caregivers (chronically stressed individuals) showed 24% slower punch biopsy wound healing rates than matched controls — a clinically meaningful difference attributable to cortisol-mediated growth factor suppression.

Second, cortisol impairs macrophage polarization: the transition from inflammatory M1 macrophages (which debride necrotic tissue and fight infection) to reparative M2 macrophages (which produce VEGF, TGF-β, and IL-10 to drive healing) requires intact IL-4/IL-13 signaling that cortisol suppresses. Wound macrophages under glucocorticoid dominance remain M1-polarized longer, producing a prolonged inflammatory phase that degrades wound-edge tissue rather than beginning the proliferative repair sequence. This is the mechanism by which stressed patients’ wounds stay “stuck” in inflammatory status despite adequate debridement and offloading.

Third, psychological stress drives hyperglycemia in diabetic patients through a mechanism distinct from dietary intake: cortisol is gluconeogenic and insulin-antagonistic, elevating fasting glucose by 15–40 mg/dL in chronically stressed type 2 diabetic patients beyond what diet alone predicts. A 2009 RCT published in Diabetes Care found that stress management training (CBT-based, 5 sessions) in patients with type 2 diabetes reduced HbA1c by 0.5% over 12 months — an effect comparable to adding a second oral hypoglycemic agent — mediated primarily through reduced cortisol-driven gluconeogenesis. For my diabetic wound patients, addressing psychological stress burden through appropriate referrals is as important as optimizing wound dressings and offloading devices.

Frequently Asked Questions About Stress, Cortisol, and Longevity

How do I know if my cortisol is chronically elevated?

The most accessible indicator is HRV measurement from a consumer wearable (low or declining HRV trend is a strong proxy for cortisol dysregulation). Clinical markers include: morning cortisol levels on serum or saliva testing (normal 10–20 mcg/dL at 8 AM; values above 25 suggest hypercortisolism), DHEA/cortisol ratio (reduced ratio indicates cortisol dominance), and the diurnal cortisol pattern via 4-point salivary sampling (morning peak, midday, afternoon, midnight). If you have central adiposity, difficulty sleeping despite fatigue, afternoon energy crashes, recurrent infections, poor wound healing, and emotional reactivity out of proportion to stressors, these collectively suggest HPA dysregulation worth evaluating with a functional medicine or endocrinology provider.

Is exercise itself a cortisol stressor? Does it age you?

Exercise acutely elevates cortisol during the session (particularly high-intensity exercise), but this is a transient hormetic stress — exactly the controlled acute exposure that trains the HPA axis to respond proportionally and recover efficiently. Chronically overtrained athletes show chronically elevated cortisol and suppressed testosterone (the overtraining syndrome pattern), but appropriately dosed exercise actually reduces resting cortisol, improves diurnal cortisol rhythm, increases GR sensitivity in the hippocampus, and reduces HPA hyperreactivity to psychological stressors. Exercise is an HPA trainer: the acute cortisol rises of each session recalibrate the HPA axis toward more precise, rapid-recovery stress responses. Only chronic overtraining (insufficient recovery) crosses into cortisol dysregulation.

Can adaptogens like ashwagandha actually reduce cortisol?

Yes — with meaningful human RCT evidence. A 2019 double-blind RCT published in Medicine randomized 58 adults to ashwagandha root extract (240 mg/day) or placebo for 60 days and found significant reductions in serum cortisol (−23% vs +2% placebo), PSS (perceived stress scale) scores, anxiety scores, and morning cortisol awakening response. A 2012 RCT of 64 adults (600 mg ashwagandha vs placebo) showed −28% serum cortisol reduction and significant improvements in all stress and anxiety measures. The active compounds (withanolides) appear to modulate GR sensitivity and reduce hypothalamic CRH output. Ashwagandha is not a pharmaceutical replacement for addressing root stressors, but the cortisol-lowering evidence is more solid than most supplement claims.

How does social connection relate to cortisol and longevity?

Social connection is a primary cortisol buffer. Oxytocin, released during positive social interaction and physical touch, directly inhibits CRH neurons in the hypothalamus, reducing HPA axis activation. Loneliness, conversely, elevates basal NF-κB-driven inflammatory gene expression and diurnal cortisol output in prospective studies. The Holt-Lunstad 2010 meta-analysis found social relationships increased survival probability by 50% — an effect larger than exercise, smoking cessation, or blood pressure treatment — likely operating substantially through cortisol and inflammatory pathway modulation. Social isolation elevates cortisol and accelerates all the biological aging mechanisms described in this article. This is why the Blue Zones all show strong social network embedding as a key Power 9 factor.

Can nature exposure reduce cortisol?

Yes — the evidence is more robust than typically recognized. A 2019 study published in Frontiers in Psychology found that 20–30 minutes spent in a natural setting (park, forest, tree-lined area) reduced salivary cortisol by 21.3% and reduced salivary alpha-amylase (sympathetic nervous system marker) by 28.1% compared to urban environment exposure. A meta-analysis of forest bathing (Shinrin-yoku) studies found consistent reductions in salivary cortisol, blood pressure, heart rate, and sympathetic nervous system activity after 15+ minutes of nature exposure. The mechanism involves reduced visual and auditory complexity compared to urban environments (reducing cognitive load and sympathetic activation), increased negative air ion exposure, phytoncide inhalation from trees (which increases NK cell activity), and reduced ambient stress cues.

How does stress affect diabetic foot wound healing specifically?

Chronic stress impairs diabetic wound healing through three synergistic mechanisms: (1) cortisol-driven growth factor suppression (TGF-β, PDGF, VEGF) reduces the healing signal strength in wound tissue that is already deficient in these signals due to diabetes; (2) stress hyperglycemia adds to dietary hyperglycemia, further elevating HbA1c and AGE formation that stiffens wound bed capillaries; (3) cortisol-impaired immune function increases infection risk in a wound that already has impaired neutrophil and macrophage function from hyperglycemia. The cumulative effect: a stressed diabetic patient’s wound heals slower, infects more readily, and is more likely to become chronic. Addressing psychological stress burden as part of diabetic wound care is not ancillary — it is a core therapeutic target.

The Bottom Line

Chronic psychological stress is a biological aging accelerant with measurable molecular consequences: 9–17 years of telomere shortening in caregivers, 3.5 years of epigenetic age acceleration in PTSD, cortisol-driven hippocampal atrophy reversible with 8 weeks of MBSR, and clinically meaningful wound healing impairment that is as important to address as any dressing choice or debridement technique. The HPA axis is not an abstract stress-response system — it is a biological aging dial, and its chronic activation costs measurable years of healthy life.

The evidence-based reversal toolkit is broader and more effective than most clinicians appreciate: HRV biofeedback (effect size −0.83 on anxiety), MBSR (30% telomerase increase, hippocampal gray matter restoration), cyclic sighing breathwork (superior to meditation for real-time affect regulation), ashwagandha (−23–28% cortisol in RCTs), social connection (50% higher survival probability), and nature exposure (−21% salivary cortisol in 20 minutes). None of these require a prescription, and most are free. The longevity case for stress management is not softer than the case for exercise, diet, or pharmacology — the molecular evidence shows equivalent magnitude of biological aging effects.

STRESS AFFECTING YOUR HEALTH OR WOUND HEALING?

Integrative Longevity Care at Balance Foot & Ankle

Dr. Biernacki addresses the full biological picture — including stress physiology, cortisol effects on wound healing, and HPA axis optimization — as part of comprehensive foot, ankle, and longevity care. Serving Howell and Southeast Michigan.

(517) 316-1134 — Call to Schedule

Balance Foot & Ankle PLLC · Howell, MI 48843

Sources & Further Reading

  • Epel ES, Blackburn EH, Lin J, et al. Accelerated telomere shortening in response to life stress. Proceedings of the National Academy of Sciences. 2004;101(49):17312-17315.
  • Hölzel BK, Carmody J, Vangel M, et al. Mindfulness practice leads to increases in regional brain gray matter density. Psychiatry Research: Neuroimaging. 2011;191(1):36-43.
  • Goyal M, Singh S, Sibinga EM, et al. Meditation programs for psychological stress and well-being: a systematic review and meta-analysis. JAMA Internal Medicine. 2014;174(3):357-368.
  • Balban MY, Neri E, Kogon MM, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine. 2023;4(1):100895.
  • Glaser R, Kiecolt-Glaser JK. Stress-induced immune dysfunction: implications for health. Nature Reviews Immunology. 2005;5(3):243-251.
  • Zannas AS, Arloth J, Carrillo-Roa T, et al. Lifetime stress accelerates epigenetic aging in an urban, African American cohort. Psychoneuroendocrinology. 2015;58:27-35.
  • Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root. Indian Journal of Psychological Medicine. 2012;34(3):255-262.
  • Holt-Lunstad J, Smith TB, Layton JB. Social relationships and mortality risk: a meta-analytic review. PLOS Medicine. 2010;7(7):e1000316.
  • Hunter MR, Gillespie BW, Chen SY. Urban nature experiences reduce stress in the context of daily life based on salivary biomarkers. Frontiers in Psychology. 2019;10:722.
  • Leproult R, Copinschi G, Buxton O, Van Cauter E. Sleep loss results in an elevation of cortisol levels the next evening. Sleep. 1997;20(10):865-870.
  • McEwen BS, Stellar E. Stress and the individual: mechanisms leading to disease. Archives of Internal Medicine. 1993;153(18):2093-2101.

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