Allostatic Load and Mortality: A Systematic Review and Meta-Analysis

Income Inequality, Gender Disparities, and Ethnic Differences: Investigating Allostatic Load in American Adults

AIM

To estimate the association between income inequality and allostatic load score (AL) in adults ages 20 years and older, with a particular focus on the differential impacts across racial and gender groups. By examining this association, the study seeks to inform targeted policy interventions to mitigate health disparities exacerbated by economic inequality.

METHODS

Utilizing data from the 1999-2016 National Health and Nutrition Examination Survey (NHANES), we assessed AL through eight biomarkers: systolic blood pressure (mm Hg), diastolic blood pressure (mm Hg), pulse rate (beats/min), body mass index (kg/m2), glycohemoglobin (%), direct HDL cholesterol (mg/dL), total cholesterol (mg/dL), and serum albumin (g/dL). Employing negative binomial regression (NBRG), we estimated incidence rate ratios (IRR) for a sample comprising 7367 men and 7814 women, adjusting for age, race/ethnicity, marital status, education, health insurance, comorbidity, and mental health professional utilization. Gini coefficients (GC) were calculated to assess income inequality among men and women.

RESULTS

Findings revealed that men exhibited a higher poverty-to-income ratio (PIR) compared to women (3.12 vs. 2.86, p < 0.01). Yet, women experienced higher rates of elevated AL (AL > 4) (31.8% vs. 29.0%) and were more adversely affected by income inequality (GC: 0.280 vs. 0.333). NBRG results indicated that high PIR individuals had a lower IRR (0.96; CI:0.92-0.95) compared to their low PIR counterparts, a trend observed in women but not men. High PIR was notably protective among White non-Hispanic (WNH) men and women. Additionally, vigorous and moderate physical activity engagement was associated with lower AL (IRR: 0.89, CI: 0.85-0.93).

CONCLUSION

The study emphasizes the importance of implementing policies that target AL in low-income populations across all racial groups, with a specific focus on Black non-Hispanic (BNH) and Hispanic communities. By prioritizing these groups, policies can more effectively target the nexus of income inequality, health disparities, and allostatic load, contributing to the reduction of health inequities.

Spouses' Individual and Shared Cumulative Risk: Implications for Functional Health and Longevity in Older Adulthood

INTRODUCTION

Multisystem biological risk, a marker of physiological dysregulation, accumulates over time in response to exposure and adaptation to chronic stress. Spousal concordance in health and health behaviors indicates potential for shared risk to accumulate within couples. This study examined spouses' shared multisystem biological risk as a modifier of individual risk and predictor of future functional limitations and mortality.

METHODS

Biomarkers and physical measures from 3,856 heterosexual couples (77%White, 31% college degree) were collected from the 2008/2010 waves of the Health and Retirement Study to construct individual and shared frailty, cardiometabolic, and total risk indices and predict functional limitations and survival at 2016/2018.

RESULTS

Multilevel Poisson and logistic regressions showed couples' cumulative shared frailty, cardiometabolic, and total risk to be associated with the number of functional limitations and survival status at follow-up. Spouses' shared cardiometabolic and total risks attenuated the effects of respective individual risks. Results were partially explained by partner selection and health experiences. Predicted probabilities were compared to gender-stratified models. The Receiver Operating Characteristic curve showed models of shared risk to have greater predictive power.

CONCLUSIONS

The findings from this study indicate that the cost of adaptation manifests not only in individuals, but also through an additional pathway that is co-constructed and shared by spouses. Our findings underscore the critical role of shared context between individuals and their spouses in the treatment process.

Associations between childhood socioeconomic characteristics, race, and risk of adverse childhood experiences in a population-based sample of US-born non-Hispanic Black and White women

BACKGROUND

Socioeconomically disadvantaged and racially minoritized populations bear an elevated risk of adverse childhood experiences (ACEs), but few studies evaluate whether racial disparities in ACEs persist within socioeconomic strata. We examine the effect of both childhood socioeconomic characteristics and race on ACE burden.

METHODS

Data are from a population-based sample (N = 1381) of US-born non-Hispanic Black (NHB) and White (NHW) women aged 20-49 years in Metropolitan Detroit and Los Angeles County, 2011-2014. Recalled data on ACEs aged < 13 years, childhood household socioeconomic position (chSEP) aged < 13 years, childhood neighborhood poverty rate (cNPR) aged 6 years (based on US Census tract), and covariates were collected during in-person interviews. ACEs are parameterized as an index (i.e., number of adversities, range 0-12) and as individual adversities. We estimate associations between cNPR (≥ 20%/10- < 20%/< 10%), chSEP index (low/medium/high), race (NHB/NHW), joint cNPR/race, and joint chSEP/race and ACEs using weighted logistic regression, to calculate odds ratios (OR), and using weighted zero-inflated Poisson regression, to calculate estimated ACE index.

RESULTS

Participants who lived in poorer neighborhoods (i.e., cNPR ≥ 20%) or households (i.e., low chSEP index) during childhood reported significantly more ACEs than participants in wealthier neighborhoods (i.e., cNPR < 10%) or households (i.e., high chSEP index). NHB vs NHW participants overall had a higher mean ACE index (3.18 vs 2.25, respectively, p < 0.05), but NHB and NHW participants who lived in poorer neighborhoods or households had a similarly elevated ACE burden (e.g., estimated ACE index for low chSEP was 3.63 [95%CI 1.19-4.97] and 4.16 [95%CI 3.68-4.65], respectively). NHB participants experienced significant discrimination at all levels of cNPR and chSEP, which contributed to their overall increased ACE risk.

CONCLUSIONS

US-born NHB and NHW girls residing in poorer neighborhoods or households had a similarly substantially elevated burden of ACEs, indicating childhood poverty is a crucial determinant of ACE risk, independent of race.

Do not exclude your observations: Negative cortisol awakening responses (CAR) may be biologically relevant

The Cortisol Awakening Response (CAR) is the change in cortisol concentrations within 30-40 minutes after waking from sleep and is frequently used in stress research. Since a positive CAR is expected, we hypothesized that negative values could be associated to an underlying health condition (reflected in hematological parameters) or to environmental exposures such as lead (Pb), which has neuroendocrine effects including altered cortisol diurnal rhythms. Our aim was to analyze the prevalence of negative CAR values and their association with hematological parameters and blood Pb (BPb) levels in pregnant women (n = 900). Cortisol was measured by luminescence immunoassay in two-day saliva samples. CAR was estimated as the difference between the first (time of awakening) and second (45 min after) cortisol concentrations for each collection day and was operationalized as: both days positive (CAR-PP, 23 %), either day with a negative (CAR-NP/PN, 40 %), and both negative (CAR-NN, 37 %). A complete blood count was done using a coulter hematology analyzer. BPb was analyzed by inductively coupled plasma-mass spectrometry. Associations between hematological variables and CAR groups were analyzed using adjusted multinomial logistic regression models. Probabilities were estimated to assess the influence of BPb and hematological variables between CAR groups. The median (25th, 75th) CAR for the first collection day was -2.76 nmol/L (-16.55, 14.62) and -4.14 nmol/L (-17.66, 13.24) for the second day. Women with higher concentrations of leukocytes, eosinophils, basophils, and BPb were more likely to belong to CAR-NN or CAR-NP/PN groups. Compared to women with CAR-PP, those with CAR-NP/PN and CAR-NN had inverse associations for leukocyte levels and higher BPb concentrations. We conclude that negative CAR values could be an indicator of an underlying health condition or associated with environmental exposures such as Pb. Research should consider a thorough assessment of negative CAR values before excluding them from analyses.

Allostatic load and its determinants in a German sample-Results from the Carla cohort

BACKGROUND

Allostatic load (AL) is a surrogate of the physiological response to stress and reflects the 'wear and tear' on the body. Previous studies indicated that socioeconomic and behavioral determinants influence AL, which in turn is associated with health outcomes. Therefore, AL is increasingly used to operationalize the relationship between social inequality, stress, and health outcomes. This study aimed to investigate associated factors and patterns of AL in the population over a 20-year period using data from the CARLA cohort.

METHODS

The analysis included 473 participants from the CARLA study (Cardiovascular Disease, Living and Ageing in Halle), aged 45-80 years at baseline. From recruitment in 2002 in Halle (Saale), three follow-up examinations took place until 2022. We calculated AL scores as the sum of standardized z-scores for metabolic, immune, cardiovascular, and anthropometric components. Descriptive statistics of AL scores were stratified by sex and age categories. Multiple regression analyses were conducted for the first and third follow-up to assess if there were changes in associations between sociodemographic factors and AL.

RESULTS

Average AL scores of men decreased, while women's AL scores returned to baseline levels after an initial decrease observed at the first follow-up. Stratified analyses of AL scores revealed that women in the younger age cohorts had lower mean AL scores at baseline than men (women: -3.47, 95% CI [-4.24; -2.71] vs. men: -1.13, 95% CI [-1.84; -0.42] at age <55). At the same time, women showed higher mean AL scores than men in older age cohorts (women: -0.32, 95% CI [-1.58; 0.95] vs. men: -0.93, 95% CI [-1.99; 0.14] at age 65-<70). Results of multiple regression models indicated lower AL scores for women (β: -1.21, 95% CI [-1.93, -0.49]). Professional status was associated with lower AL scores for men but not for women (β: -1.06, 95% CI [-2.02, -0.11] for men). Further, physical activity was negatively associated with AL scores for the total study sample and for women (β: -0.54, 95% CI [-0.82, -0.26]) for total sample and β: -0.74, 95% CI [-1.17, -0.32] for women).

CONCLUSION

Our results highlight the importance of health awareness and physical activity for overall health, assessed by AL. Distinct AL score changes and sex-specific socioeconomic influences offer insights into sex-related patterns of aging. Further research is needed to understand the underlying mechanisms of socioeconomic influences on stress-related aging processes between sexes.

Influence of a Virtual Plant-Based Culinary Medicine Intervention on Mood, Stress, and Quality of Life Among Patients at Risk for Cardiovascular Disease

Background: Cooking and dietary intake may affect psychological well-being. Objective: We evaluated the effects of a virtual culinary medicine teaching kitchen intervention on psychosocial health. Methods: In a randomized crossover trial implementing a vegan diet high or low in extra virgin olive oil, adults with ≥5% atherosclerotic cardiovascular disease risk participated in eight weekly group cooking classes. Psychosocial survey assessments of perceived stress, positive and negative affect, and quality of life before and after the intervention were compared using paired t-tests and post hoc linear mixed models. Results: Pre-post analysis among 40 participants (75% female, 64.4 ± 8.6 years) indicated a 19% decrease in perceived stress (p < 0.01), 6-8% increase in positive affect (p < 0.04), and 13% decrease in negative affect (p = 0.02). Energy/fatigue and general health-related quality of life improved post-intervention (both p ≤ 0.02). Conclusions: Participation in a group culinary medicine intervention improved mood, stress, and health-related quality of life, warranting larger, diverse studies. Benefits may relate to social support, improved health status, diet factors, and emerging psychosocial influences of cooking.

Impact of Social Determinants of Health on Outcomes of Nontraumatic Subarachnoid Hemorrhage

BACKGROUND

Nontraumatic subarachnoid hemorrhage (SAH) presents a significant health burden, yet the influence of social determinants of health on outcomes remains unclear. This study examines the impact of social determinants of health on outcomes of patients with SAH.

METHODS AND RESULTS

We conducted a retrospective analysis of prospectively collected data from the GWTG (Get With The Guidelines)-Stroke registry, including patients with SAH across the United States from 2012 to 2021. The role of the Social Deprivation Index (SDI) and adjusted gross income, stratified into tertiles, were assessed. Outcomes included in-hospital death, length of stay, and discharge disposition (good: home/rehabilitation; poor: long-term facility/hospice/death). Covariates included demographics, medical history, vascular risk factors, and SAH severity. Multivariable regressions were used to estimate associations, presenting odds ratios (ORs) and relative risks. Our study comprised 108 090 patients with nontraumatic SAH (mean age, 59.76 years; 61.3% women). The average length of stay was 12.04 days, 55.6% had good discharge disposition, and the overall mortality rate was 15.5%. Analyses showed that a high Social Deprivation Index was associated with reduced odds of a good discharge (unadjusted OR, 0.90 [95% CI, 0.87-0.92]; adjusted OR, 0.87 [95% CI, 0.82-0.92]), while higher adjusted gross income correlated with decreased death (unadjusted OR, 0.94 [95% CI, 0.90-0.97]; adjusted OR, 0.90 [95% CI, 0.83-0.96]). A high Social Deprivation Index was significantly associated with longer length of stay (unadjusted relative risk, 1.06 [95% CI, 1.07-1.26]; adjusted relative risk, 1.03 [95% CI, 1.01-1.13]).

CONCLUSIONS

Social determinants of health shape outcomes for patients with SAH, with a clear gradient of impact across socioeconomic levels.

Cerebrovascular Health Among Sex- and Gender-Diverse People: A Narrative Review

Purpose of Review

Sex and gender diversity includes people who are intersex, transgender, and nonbinary. Americans are identifying as sex and gender diverse (SGD) in increasing numbers. Although data are limited on the diagnosis and management of stroke in SGD communities, the current literature suggests that there may be unique health needs among these marginalized populations.

Recent Findings

Health disparities and community-specific stressors may influence the frequency of stroke and traditional cerebrovascular disease risk factors among SGD people. In addition, transgender and gender-diverse people have higher rates of atypical stroke risk factors, such as sexually transmitted infections and an increased mental health burden. The adverse effects of some gender-affirming therapies can increase the rates of stroke, particularly in transfeminine people who use long-term estrogen as part of their medical gender transition. Decisions to discontinue hormonal therapy after stroke should be weighed against the psychological risks of doing so. In addition, some commonly prescribed medications for stroke prevention could interact with gender-affirming hormone therapies. Neurologists should collaborate with primary care providers and endocrinologists to screen for and manage cerebrovascular disease risk factors for the primary and secondary prevention of stroke. Limited evidence suggests intersex people may be at higher risk of cerebrovascular disease, particularly those with congenital adrenal hyperplasia (CAH). People diagnosed with CAH have unique risk factors of stroke including treatment with stress-dose corticosteroids or polycythemia due to hyperandrogenism.

Summary

Creating affirming environments and increasing knowledge of health care for SGD communities may lead to improved equitable treatment of SGD patients with stroke by increasing community trust in health providers and incorporating use of best practices in clinical care and research settings. Limited data exist on stroke clinical presentations and how stroke is experienced and treated among SGD people, particularly among those with multiple marginalized identities, those presenting with acute stroke, and those requiring secondary stroke prevention.

Associations Between Social Determinants of Health, Allostatic Load, and Anthracycline Cardiotoxicity in a Diverse Patient Population

BACKGROUND

Allostatic load (AL) is a measurement of physiological burden of chronic stress, operationalized using a composite score derived from biomarkers from multiple physiologic systems. The relationship between AL and anthracycline cardiotoxicity is unclear.

METHODS AND RESULTS

We included consecutive adult patients who underwent anthracycline-based chemotherapy from 2016 to 2019 for any type of cancer. Patients with preexisting heart failure and lack of AL score measures were excluded from the analysis. A composite AL score was calculated using 9 biomarkers tested before initiating chemotherapy. The end point was the development of cardiotoxicity (defined as clinical heart failure or drop in left ventricular ejection fraction≥10% to <50%). A total of 718 patients were included in the analysis (29% Non-Hispanic White, 31% Non-Hispanic Black, 40% Hispanic). The mean AL score was 2.4±1.4 and it was significantly higher in Non-Hispanic Black and Hispanic patients compared with Non-Hispanic White patients (2.5±1.3 in Non-Hispanic Black versus 2.4±1.3 in Hispanic versus 2.1±1.5 in Non-Hispanic White, P=0.031). In patients who developed cardiotoxicity, AL score was significantly higher than patients without cardiotoxicity (2.7±1.4 versus 2.3±1.3, P=0.006). AL score was independently associated with incident anthracycline cardiotoxicity after adjusting for race and ethnicity, age, sex, cardiovascular risk factors, anthracycline dose, baseline left ventricular ejection fraction, cancer type, and cancer metastasis (hazard ratio 1.20 per 1 AL score increase [95% CI, 1.02-1.43], P=0.033). AL score remained significantly associated with anthracycline cardiotoxicity after additional adjustment of social determinants of health.

CONCLUSIONS

AL score can be a potential important prognostic marker in the prediction of cardiotoxicity in patients with cancer undergoing cardiotoxic treatment independent of social determinants of health.

The Constrained Disorder Principle: Beyond Biological Allostasis

The constrained disorder principle (CDP) defines complex biological systems based on inherent variability. Allostasis refers to the physiological processes that help maintain stability in response to changing environmental demands. Allostatic load describes the cumulative wear and tear on the body resulting from prolonged exposure to stress, and it has been suggested to mediate the relationship between stress and disease. This study presents the concepts of CDP and allostasis while discussing their similarities and differences. We reviewed the current literature on the potential benefits of introducing controlled doses of biological noise into interventions, which may enhance the effectiveness of therapies. The paper highlights the promising role of variability provided by a CDP-based second-generation artificial intelligence system in improving health outcomes.

Measuring polar bear health using allostatic load

The southern Beaufort Sea polar bear sub-population (Ursus maritimus) has been adversely affected by climate change and loss of sea ice habitat. Even though the sub-population is likely decreasing, it remains difficult to link individual polar bear health and physiological change to sub-population effects. We developed an index of allostatic load, which represents potential physiological dysregulation. The allostatic load index included blood- and hair-based analytes measured in physically captured southern Beaufort bears in spring. We examined allostatic load in relation to bear body condition, age, terrestrial habitat use and, over time, for bear demographic groups. Overall, allostatic load had no relationship with body condition. However, allostatic load was higher in adult females without cubs that used terrestrial habitats the prior year, indicating potential physiological dysregulation with land use. Allostatic load declined with age in adult females without cubs. Sub-adult males demonstrated decreased allostatic load over time. Our study is one of the first attempts to develop a health scoring system for free-ranging polar bears, and our findings highlight the complexity of using allostatic load as an index of health in a wild species. Establishing links between individual bear health and population dynamics is important for advancing conservation efforts.

Cognitive ability in offspring conscripts and cardiovascular disease risk in extended family members: assessing the impact of modifiable risk factors on familial risk

BACKGROUND

Previous studies have demonstrated an inverse association between cognitive ability (CA) and risk of cardiovascular diseases (CVDs). This study aims to investigate the associations between CA in offspring and CVD mortality in relatives of the parental generation (ie, parents, aunts/uncles (A/U) and the partners of A/U) and assesses the role of modifiable risk factors on these associations.

METHODS

This longitudinal study included nearly 3 million adults who were followed up from age 45 until death. Data for participants were obtained through the linkage of various Norwegian surveys and registries. HRs for CVD mortality among the parental generation in relation to offspring CA were estimated using Cox proportional hazards regression.

RESULTS

One standard deviation increase in CA was associated with a 23%, 17%, 9% and 9% CVD mortality reduction in mothers (HR: 0.77, 95% CI (0.74, 0.81)), fathers (0.83, (0.81, 0.86)), A/U (0.91, (0.87, 0.94)) and A/U partners (0.91, (0.89, 0.94)), respectively. Accounting for modifiable risk factors in the parental generation attenuated the association in mothers from 23% to 9% (0.91, (0.87, 0.96)), fathers from 17% to 7% (0.93, (0.91, 0.96)), A/U from 9% to 1% (0.99, (0.96, 1.03)) and A/U partners from 9% to 2% (0.98, (0.95, 1.01)).

CONCLUSIONS

We observed an inverse CA-CVD association in all familial relationships including non-genetically related duos (offspring-A/U partners). CA and CVD probably have shared causes such as genetic and environmental components common to the family members. These associations were largely accounted for by modifiable risk factors.

Intergenerational mobility, race, and allostatic load: Diminished health returns for Black older adults?

Although socioeconomic status is salient for health and well-being across the life course, previous research indicates that the social gradient in health is racialized and that Black adults experience diminishing health returns on higher socioeconomic status. We extend this literature by examining whether there are diminishing physiological health returns on intergenerational mobility groups for Black adults and, if so, whether diminishing health returns vary across age. We use six waves of data from the Health and Retirement Study (N = 11,846) and mixed effects models; and average marginal effects are used to interpret the race by intergenerational mobility interaction. We found evidence of racial disparities in allostatic load and that Black respondents with stable high socioeconomic status experienced diminished health returns that did not vary across age. Future research is needed to undercover practices and policies to ameliorate diminishing health returns for Black adults.

Allostatic load and cardiometabolic health in a young adult South African population: the African-PREDICT study

Sustained stress, assessed as a high allostatic load score (ALS), is an independent cardiovascular disease (CVD) risk factor in older adults but its associations in young people are undefined. Since neurological maturation impacts stress adaptation and CVD risk, we assessed the relationship of ALS with CVD profile by using a tiered approach stratified by age [emerging adults (EA) aged 20-24 yr vs. young adults (YA) aged 25-30 yr] and ALS (high vs. low). In 1,054 healthy participants of the African Prospective Study on Early Detection and Identification of Cardiovascular Disease and Hypertension (African-PREDICT), we determined: 1) ALS in EA versus YA; 2) the relationship between ALS and cardiovascular (CV) health, and 3) the odds of high ALS > 4 to identify masked hypertension (HT) and prediabetes as cardiometabolic outcomes. A nine-component, four-domain ALS was compiled: neuroendocrine [dehydroepiandrosterone (DHEA), cortisol], inflammatory [interleukin-6 (IL-6), C-reactive protein (CRP)], cardiovascular [systolic blood pressure (SBP) and diastolic blood pressure (DBP)], and metabolic [total cholesterol, high density lipoprotein cholesterol (HDL-cholesterol), body mass index (BMI)]. Retinal vessel caliber, pulse wave velocity (PWV), and cardiac structure and function were assessed. Median ALS was 3 (range: 1-9). A high-ALS > 4 was more common in YA versus EA (47 vs. 35%, P = 0.032). Higher ALS associated with narrower retinal arteries (P < 0.01), greater PWV (P ≤ 0.01), lower diastolic function (P < 0.01), and left ventricular (LV) function (P < 0.01). High-ALS increased the odds of having masked hypertension, prediabetes, narrower retinal arteries, higher LV mass, poorer diastolic and ventricular functions (all P ≤ 0.01), in EA and YA independent of traditional CVD risk factors. The composite ALS identified early-stress dysregulation in cardiometabolic health and higher odds for masked hypertension and prediabetes in young adults. Cumulative stress may be a modifiable, independent cardiometabolic risk factor in younger populations that needs further investigation.NEW & NOTEWORTHY This is the first study to assess the effect of stress, as a composite allostatic load score, on micro-, macrovascular, and central cardiac features in healthy emerging and young adults, independent of traditional cardiovascular risk markers. It exemplifies independent stress-induced changes throughout the cardiovascular tree, which may increase the risk of cardiometabolic complications, masked hypertension, and prediabetes. Sustained stress may be a key etiological factor in cardiometabolic disease development in a young population.

Measuring the Interrelationships Between Cognitive Performance, Race/Ethnicity, Discrimination, Health Behaviors, and Physiological Dysregulation: A Path Analysis of the Multi-Ethnic Study of Atherosclerosis

ObjectiveThe objective of this study was to examine the interrelationships between cognitive performance, race/ethnicity, discrimination, health behaviors, and physiological dysregulation.MethodsWe used data from the Multi-Ethnic Study of Atherosclerosis (MESA) (N = 1667). We used path analyses to examine the association between discrimination, physiological dysregulation, health behaviors, and cognitive performance using the Cognitive Ability Screening Instrument (CASI) at Exam 5 (2010-12) and Exam 6 (2016-18). We examined the relationship between discrimination at Exam 1 (2000-02) and physiological dysregulation at Exam 5. We used overall and ethnoracial-stratified path analysis. All models were adjusted for age, sex, site, depression, stress, socioeconomic status, and APOE-e4.ResultsPhysiological dysregulation was associated with worse cognitive performance in the full sample and among the White ethnoracial subgroup. Everyday discrimination was associated with better cognitive performance among Black participants.DiscussionAssociations between discrimination, physiological dysregulation, and cognitive performance vary and should be examined longitudinally.

Association of allostatic load measured by allostatic load index on physical performance and psychological responses during arduous military training

Military personnel experience decrements in physical fitness and psychological well-being during training that may be attributed to allostatic load. This investigation examined the association between allostatic load measured by the allostatic load index (ALI) and physical performance and psychological responses in personnel undergoing a 10-week training course. Thirty-one participants (14 women) provided biochemical, questionnaire (perceived stress appraisal (PSS), sleep difficulty (SD), resilience (CD-RISC-25), and Physical Fitness Test (PFT; three-mile run [3MR], pullups, Run-Row PFT score, Push-Pull PFT score, Crunches-Plank PFT score, and total PFT score)) data before and after training. ALI (0-8) was calculated using biomarker components from neuroendocrine, autonomic, and immune systems. Simple linear regression analysis assessed the association between change (Δ) in ALI and responses. Backward stepwise regression identified components associated with responses (α = 0.05). In men, ΔALI was associated with Δpullups (β = -0.88, p = 0.015), Δpush-pull PFT score (β = -2.87, p = 0.013), Δtotal PFT score (β = -3.48, p = 0.007), and ΔSD (β = -0.56, p = 0.046) with immune components explaining relationships. In women, ΔALI was associated with ΔSD (β = -1.25, p < 0.001) and ΔCD-RISC-25 (β = 2.65, p = 0.025) with no component explaining relationships. Increased ALI is associated with worsened physical performance in men and improved psychological outcomes in women, highlighting potential sex-specific responses to increased allostatic load during training.

Allostatic Load as a Short-Term Prognostic and Predictive Marker

It would be highly valuable to possess a tool for evaluating disease progression and identifying patients at risk of experiencing a more severe clinical course and potentially worse outcomes. The concept of allostatic load, which represents the overall strain on the body from repeated stress responses, has been recognized as a precursor to the development of chronic illnesses. It functions as a cumulative measure of the body's capacity to adapt to stress. Numerous studies have demonstrated that elevated allostatic load levels are associated with various negative health outcomes, both physical and mental, and are more predictive of mortality than individual biomarkers. Leveraging the unique circumstances presented by the COVID-19 pandemic, we evaluated different clinical and laboratory parameters in hospitalised COVID-19 patients to assess allostatic load. Our results indicated that allostatic load acts as a strong predictor of prolonged hospitalisation, increased ICU days, and mortality. This highlights its efficacy as a precise gauge of biological dysregulation linked to the response to COVID-19 during disease progression. Allostatic load is easily obtainable and provides an early, cost-effective indication of disease prognosis. Additionally, it has the potential to forecast the necessity for ICU admission. As a result, this parameter, indicative of the comprehensive physiological disruption in response to stress, emerges as a promising prognostic marker for hospitalised patients, extending beyond COVID-19.

Allostatic load, genetic susceptibility, incidence risk, and all-cause mortality of colorectal cancer

BACKGROUND

Allostatic load (AL) reflects the cumulative burden of chronic stress throughout life, potentially influencing the onset and prognosis of cancer. However, the associations between AL, colorectal cancer (CRC) risk, and all-cause mortality in patients with CRC remain unclear.

METHODS

We analyzed the associations between AL and CRC risk in 304 959 adults and all-cause mortality in 1794 patients with CRC from the UK Biobank, using Cox proportional hazards regression models.

RESULTS

Compared with the AL level in the first quartile, individuals in the second to fourth quartiles had a respective 20%, 29%, and 43% increased risk of CRC; 15%, 24%, and 42% increased risk for colon cancer; and 30%, 38%, and 45% increased risk for rectal cancer. We identified a positive dose-gradient association of AL score with CRC risk, including colon and rectal cancer. Additionally, the association between AL and increased risk of CRC was observed across different strata of genetic susceptibility for CRC. Eliminating AL exposures could prevent nearly 39.24% (95% confidence interval [CI] = 36.16 to 42.32) of CRC events. Meanwhile, a statistically association between the AL and all-cause mortality in patients with CRC was found, with a hazard ratio of 1.71 (95% CI = 1.16 to 2.50) for the fourth quartile compared with the AL score in the first quartile, demonstrating a positive dose-response relationship.

CONCLUSION

High AL was associated with increased CRC risk and all-cause mortality in CRC patients. Future research should prioritize the development of cognitive or behavioral intervention strategies to mitigate the adverse effects of AL on CRC incidence and prognosis.

Effects of Allostatic Load on Long-Term Survival After Stroke

BACKGROUND

Allostatic load index (ALI) is often utilized to quantify the physiological response to stress. This study assesses the relationship between ALI and its impact on all-cause, cardiovascular, and stroke mortality in individuals with a self-reported history of stroke and within the general National Health and Nutritional Examination Survey sampled population.

METHODS

Using data from the National Health and Nutritional Examination Survey (III, 1988-1994) and the 2015 Linked Mortality File, we selected adults aged ≥25 years with self-reported stroke. We computed the weighted prevalence of each ALI category to obtain nationally representative estimates with higher ALI corresponding to a higher stress burden. We evaluated the relationship between ALI category and mortality outcomes using the Cox proportional hazard model, considering the survey design variables and adjusting for age, sex, race/ethnicity, education, marital status, income, drinking, and smoking status.

RESULTS

Of 17 284 people screened in the National Health and Nutritional Examination Survey sample population, 15 567 individuals were included in the study. The ALI distribution was 48.3% ALI ≤1, 21.7% ALI=2, and 30% ALI ≥3. Of 414 individuals with a reported history of stroke, there were 11.8% ALI ≤1, 22.1% ALI=2, and 66.1% ALI ≥3. There was an association between a higher ALI and older age, Black and Mexican American race, and >1 comorbidity in the overall sampled population. In the population with prior stroke, those with ALI ≥3 had 2.7× higher adjusted all-cause mortality (hazard ratio, 2.7 [CI, 1.5-4.9]) and 4.5× higher adjusted cardiovascular mortality (hazard ratio, 4.5 [CI, 1.4-14.3]) compared with those with ALI ≤1. In the general sampled National Health and Nutritional Examination Survey population, the ALI ≥3 group had 1.8× higher adjusted stroke mortality (hazard ratio, 1.8 [CI, 1.1-3.1]).

CONCLUSIONS

Baseline higher ALI is associated with greater all-cause and cardiovascular mortality in stroke survivors and greater stroke mortality in the overall sampled National Health and Nutritional Examination Survey population.

Biological age and predicting future health care utilisation

We explore the role of epigenetic biological age in predicting subsequent health care utilisation. We use longitudinal data from the UK Understanding Society panel, capitalising on the availability of baseline epigenetic biological age measures along with data on general practitioner (GP) consultations, outpatient (OP) visits, and hospital inpatient (IP) care collected 5-12 years from baseline. Using least absolute shrinkage and selection operator (LASSO) regression analyses and accounting for participants' pre-existing health conditions, baseline biological underlying health, and socio-economic predictors we find that biological age is selected as a predictor of future GP consultations and IP care, while chronological rather than biological age is selected for future OP visits. Post-selection prediction analysis and Shapley-Shorrocks decompositions, comparing our preferred prediction models to models that replace biological age with chronological age, suggest that biological ageing has a stronger role in the models predicting future IP care as opposed to "gatekeeping" GP consultations.

The gender and age perspectives of allostatic load

The role of chronic stress in the development of chronic diseases, especially multimorbidity, through the pathways of increasing allostatic load, and finally, allostatic overload (the state when a compensatory mechanism is likely to fail) is being emphasized. However, allostatic load is a dynamic measure that changes depending on sex, gender, age, level and type of stress, experience of a stressful situation, and coping behaviors. Many other factors such as race, ethnicity, working environment, lifestyle, and circadian rhythm of sleep are also important. The aim of this paper was to synthesize the available information on allostatic load differences, especially those connected to sex/gender and age, and to provide a model for the future study of allostatic load, with a focus on these differences. By carefully studying allostatic load factors, we realized that many studies do not take this allostatic load difference into account in the analysis methods. In this paper, we also support the idea of further research to develop new allostatic load analysis strategies that will include all knowledge about sex/gender differences and that will, in more detail, explain numerous changeable social and educational factors that are currently accepted as biological ones. Furthermore, specific allostatic load biomarkers are expressed differently in different age groups, indicating that the discrepancies cannot be attributed solely to sex/gender disparities. This kind of approach can be valuable, not only for better explaining the differences in the frequency and age of onset of chronic diseases and multimorbidity, but also for the potential planning and development of preventive actions based on the aforementioned sex/gender and age disaparities, in order to prevent the most frequent diseases and to establish specific biomarker cut-off values for each sex/gender and age group.

Allostatic Load, Educational Attainment, and Risk of Cancer Mortality Among US Men

Importance

Health disparities among racial and ethnic minoritized populations, particularly for cancer mortality rates, remain a major public health concern. Men from underrepresented backgrounds (Black and Hispanic men, specifically) face the pervasive effects of discrimination in their daily lives, which also contribute to the complex associations among allostatic load (a marker of chronic stress), educational opportunities, and elevated risks of cancer mortality.

Objective

To elucidate the associations among educational attainment, allostatic load, and cancer mortality risk among men.

Design, Setting, and Participants

This is a retrospective cohort analysis of data from the National Health and Nutrition Examination Survey, a nationally representative sample of approximately 5000 people across the US, from 1988 to 2010 linked with data from the National Death Index, which served as follow-up data for the cohort and was available through December 31, 2019. Participants included men aged 18 years and older. Data were analyzed from June to October 2024.

Exposure

Allostatic load data were stratified by educational attainment levels, categorized as (1) less than high school education and (2) high school graduate and above. Allostatic load score was calculated as the sum of total abnormal biomarkers and health measures (9 total). Participants were considered to have high allostatic load if their score was 3 or more.

Main Outcomes and Measures

The primary outcome was cancer death. Weighted Cox proportional hazards models were fitted to estimate adjusted hazard ratios (HRs) of cancer death between educational attainment and allostatic load (adjusted for age, income, and smoking status).

Results

Among all 20 529 men (mean [SE] age, 41.00 [0.22] years), those with high AL and less than high school educational attainment had a greater than 4-fold increased risk of cancer mortality (unadjusted HR, 4.71; 95% CI, 3.36-6.60) compared with those with low allostatic load and a college degree or higher. Similarly, both Black men (HR, 4.19; 95% CI, 2.09-8.40) and White men (HR, 5.77; 95% CI, 4.06-8.20) with high allostatic load and less than high school educational attainment had higher risks for cancer death compared with race-specific counterparts with college education and low allostatic load. After adjustments for age, poverty-to-income ratio, smoking status, history of cancer, and ever congestive heart failure and heart attack, the associations were attenuated, but all men (HR, 1.69; 95% CI, 1.15-2.47) and White men (HR, 1.82; 95% CI, 1.16-2.85) still had greater than 50% increased risk of cancer death compared with men with college education and low allostatic load.

Conclusions and Relevance

This study highlights the detrimental association of not attaining a high school degree, combined with high allostatic load as a marker of chronic stress, with cancer mortality. Efforts to promote educational attainment and address the underlying social determinants of health are imperative in reducing cancer disparities in this population.

An evaluation of the All of Us Research Program database to examine cumulative stress

OBJECTIVES

To evaluate the NIH All of Us Research Program database as a potential data source for studying allostatic load and stress among adults in the United States (US).

MATERIALS AND METHODS

We evaluated the All of Us database to determine sample size significance for original-10 allostatic load biomarkers, Allostatic Load Index-5 (ALI-5), Allostatic Load Five, and Cohen's Perceived Stress Scale (PSS). We conducted a priori, post hoc, and sensitivity power analyses to determine sample sizes for conducting null hypothesis significance tests.

RESULTS

The maximum number of responses available for each measure is 21 participants for the original-10 allostatic load biomarkers, 150 for the ALI-5, 22 476 for Allostatic Load Five, and n = 90 583 for the PSS.

DISCUSSION

The NIH All of Us Research Program is well-suited for studying allostatic load using the Allostatic Load Five and psychological stress using PSS.

CONCLUSION

Improving biomarker data collection in All of Us will facilitate more nuanced examinations of allostatic load among US adults.

Association between plant and animal protein and biological aging: findings from the UK Biobank

PURPOSE

This study aimed to evaluate the relationship between plant protein, animal protein and biological aging through different dimensions of biological aging indices. Then explore the effects of substitution of plant protein, animal protein, and their food sources on biological aging.

METHODS

The data came from 79,294 participants in the UK Biobank who completed at least two 24-h dietary assessments. Higher Klemera-Doubal Method Biological Age (HKDM-BA), higher PhenoAge (HPA), higher allostatic load (HAL), and longer telomere length (LTL) were estimated to assess biological aging. Logistic regression was used to estimate protein-biological aging associations. Substitution model was performed to assess the effect of dietary protein substitutions.

RESULTS

Plant protein intake was inversely associated with HKDM-BA, HPA, HAL, and positively associated with LTL (odds ratios after fully adjusting and comparing the highest to the lowest quartile: 0.83 (0.79-0.88) for HKDM-BA, 0.86 (0.72-0.94) for HPA, 0.90 (0.85-0.95) for HAL, 1.06 (1.01-1.12) for LTL), while animal protein was not correlated with the four indices. Substituting 5% of energy intake from animal protein with plant protein, replacing red meat or poultry with whole grains, and replacing red or processed meat with nuts, were negatively associated with HKDM-BA, HPA, HAL and positively associated with LTL. However, an inverse association was found when legumes were substituted for yogurt. Gamma glutamyltransferase, alanine aminotransferase, and aspartate aminotransferase mediated the relationship between plant protein and HKDM-BA, HPA, HAL, and LTL (mediation proportion 11.5-24.5%; 1.9-6.7%; 2.8-4.5%, respectively).

CONCLUSION

Higher plant protein intake is inversely associated with biological aging. Although there is no association with animal protein, food with animal proteins displayed a varied correlation.

Socioeconomic-Status-Based Disrespect, Discrimination, Exclusion, and Shaming: A Potential Source of Health Inequalities?

Observing an association between socioeconomic status (SES) and health reliably leads to the question, "What are the pathways involved?" Despite enormous investment in research on the characteristics, behaviors, and traits of people disadvantaged with respect to health inequalities, the issue remains unresolved. We turn our attention to actions of more advantaged groups by asking people to self-report their exposure to disrespect, discrimination, exclusion, and shaming (DDES) from people above them in the SES hierarchy. We developed measures of these phenomena and administered them to a cross-sectional U.S. national probability sample (N = 1,209). Consistent with the possibility that DDES represents a pathway linking SES and health, the SES→health coefficient dropped substantially when DDES variables were controlled: 112.9% for anxiety, 43.8% for self-reported health, and 49.4% for cardiovascular-related conditions. These results illustrate a need for a relational approach emphasizing the actions of more advantaged groups in shaping health inequities.

Hidden in plain text: Uncovering hidden heterogeneity and social stratification in Ireland AD 1150-1800

OBJECTIVES

Between the Irish late medieval (AD 1150-c.1550) (LMP) and post-medieval (AD c.1550-1800) (PMP) periods, colonial practices changed land ownership. Contextualizing these periods within a biocultural political economy framework supports increasing social inequality in the PMP, which we expect to be reflected in different skeletal markers of longevity and stress. Therefore, we hypothesized that widespread exposure to stressors and resource deprivation contributed to lower longevity in the PMP compared to the LMP, and that there would be greater variation between sites in the frequency of linear enamel hypoplasias (LEH) in the PMP.

MATERIALS AND METHODS

We estimated age and counted matched pairs of LEH on 526 adult skeletons from the Irish counties of Dublin, Kildare, Louth, and Meath. Age-at-death was compared through Kaplan-Meier survival functions and non-parametric tests. Linear enamel hypoplasias prevalences were analyzed with Mann-Whitney U tests and Generalized Linear Models.

RESULTS

Age-at-death distribution changed between the LMP and PMP for males, with males experiencing an increase in median-age-at-death. The same was untrue for females, who show no changes in median age-at-death. Analysis of LEH frequency per individual showed that variation between sites was significant in the post-medieval period but not in the late medieval period.

CONCLUSION

These results suggest that social organization contributed to embodied health experiences that varied across time periods. Specifically, populations from the PMP appear to have embodied greater social inequality in their more varied susceptibility to stress. Our work demonstrates the strength of pairing historical texts with the analysis of skeletal remains to evaluate the impact of social structures on biological frailty.

Association of allostatic load with functional disability in the China Health and Retirement Longitudinal Study

OBJECTIVES

Allostatic load (AL) is an index that manifests as cumulative wear and tear on multiple physiological systems resulting from repeated adaptation to stressors throughout the life course. Higher AL was found to be associated with increased risk of adverse health outcomes, but studies on functional disability among large Chinese older population were limited. We aimed to investigate the associations of AL with functional disability among Chinese older adults.

RESEARCH DESIGN AND METHODS

This prospective cohort study included 5880 older adults who were at least 50 years old and participated in the CHARLS at baseline (2011 wave), with 3 follow-ups (2013, 2015 and 2018 waves). We selected 11 biomarkers from 4 physiological systems to construct AL. AL score was classified into three categories based on tertiles: 0-1 (low burden), 2-3 (medium burden) and 4-11 (high burden). Functional disability was assessed by activities of daily living (ADL) and instrumental activities of daily living (IADL). Multivariable logistic regression models examined the association between baseline AL, transitions of AL burden and incidence of functional disability.

RESULTS

In cross-sectional analyses, medium and high AL burden were associated with an increased prevalence of ADL disability, while association was only significant between high AL burden and IADL disability. During the 7-year follow-up, 1102 and 1777 participants incident ADL disability and IADL disability, respectively. Those with medium and high AL burden had an increased risk of new-onset ADL disability than those with low AL burden ("medium": OR = 1.25, 95%CI = 1.01, 1.55; "high": OR = 1.69, 95%CI = 1.32, 2.18). As for IADL disability, association was only significant in "high" group (OR = 1.50, 95% CI = 1.24, 1.83). We also found keep medium/high AL burden in 2011 and 2015 was associated with new-onset ADL (OR = 2.27, 95%CI = 1.50, 3.44) and IADL disability (OR = 1.51, 95%CI = 1.11, 2.05) in 2018.

CONCLUSION

These results show that higher AL predicts functional disability among Chinese older adults. Monitoring AL and paying close attention to those with medium/high AL burden may aid prevention of adverse health outcomes, thus giving a healthier ageing experience to a large proportion of the population.

Affect regulation and allostatic load over time

OBJECTIVE

Emerging work suggests that affect regulation strategies (e.g., active coping, anger expression) predict disease and mortality risk, with sometimes divergent estimates by sex or education levels. However, few studies have examined potential underlying biological mechanisms. This study assessed the longitudinal association of affect regulation with future allostatic load.

METHOD

In 2004-2006, 574 participants from the Midlife in the United States study completed validated scales assessing use of nine general and emotion-specific regulatory strategies (e.g., denial, anger expression). As a proxy for how flexibly participants regulate their affect, variability in the use of regulatory strategies was operationalized using a standard deviation-based algorithm and considered categorically (i.e., lower, moderate, greater variability) to assess non-linear effects. Participants also provided data on relevant covariates and 24 allostatic load biomarkers (e.g., cortisol, blood pressure). In 2017-2021, these biomarkers were again collected. Linear regressions modeled betas (β) and 95 % confidence intervals (CI) examining associations of affect regulatory constructs with future allostatic load.

RESULTS

In fully-adjusted models including initial allostatic load, general regulatory strategies were unrelated to future allostatic load. Yet, greater versus moderate affect regulation variability levels predicted lower allostatic load (β=-0.14; 95 %CI: -0.27, -0.01). Only among more educated participants, greater use of anger expression predicted lower allostatic load, while the reverse was noted with anger control (βexpression=-0.12; 95 %CI: -0.20, -0.05; βcontrol=0.14; 95 %CI: 0.05, 0.24).

CONCLUSIONS

While general regulatory strategies appeared unrelated to allostatic load, greater variability in their use and anger-related strategies showed predictive value. Subsequent studies should examine these associations in larger, more diverse samples.

Tipping Point: Pathogenic Stress and the Biopolitics of Euthanasia

Hopelessness and demoralization following a terminal diagnosis can affect the capacity for self-governance. Such dispositions can increase the allostatic load-the cumulative burden of stress and anxiety-resulting in a neurophysiologic decline that can impair autonomy and influence the desire to end one's life deliberately. An allostatic overload is characterized by the inability to autoregulate stress and is associated with pathological changes to the hypothalamic-pituitary-adrenal axis and hippocampus. These changes raise concerns about the reliability of concepts of autonomy in extremis, potentially undermining arguments that are used to justify voluntary euthanasia and medically assisted death. Studies have associated depression and hopelessness with suicidal ideation in the general population. However, fewer studies have examined how patients without a history of depression or suicidal ideation may suddenly contemplate the act when facing a terminal prognosis. This paper will argue that an allostatic overload can help explain how the spectrum of physical and psychological comorbidities associated with the onset of a terminal illness can influence a decision to hasten death. Data show that patients with a terminal disease wishing to hasten death typically exhibit lower rates of clinical depression, higher rates of demoralization, and a greater likelihood of rational suicide. These differences indicate that suicidal ideation in the terminal disease patient population is different. Changes in autonomous decision-making secondary to pathological alterations in the brain may offer an explanation. Such changes have been shown to dysregulate executive control functions, specifically intentionality and voluntariness. Clinical evidence also indicates that spirituality and hopefulness can help manage the allostatic load during the palliative stages of a disease so that patients can better process end-of-life decisions. Based on these data, this paper will further argue that jurisdictions offering euthanasia are morally compelled to make mental and spiritual counseling available to patients seeking this course of action.

High free sugars, insulin resistance, and low socioeconomic indicators: the hubs in the complex network of non-communicable diseases in adolescents

BACKGROUND

Noncommunicable diseases (NCDs) predominantly affect adults, but pathophysiological changes begin decades earlier, as a continuum, with initial events apparent in adolescence. Hence, early identification and intervention are crucial for the prevention and management of NCDs. We investigated the complex network of socioeconomic, behavioral, and metabolic factors associated with the presence of NCD in Brazilian adolescents.

METHODS

We conducted a cross-sectional study nested within the São Luís segment of the Ribeirão Preto, Pelotas, and São Luís (RPS) cohort's consortium, focusing on 18-19-year-olds (n = 2515). Data were collected prospectively, from which we constructed a complex network with NCD-related factors/indicators as nodes and their co-occurrences as edges. General and sex-based models analyzed: socioeconomic status, behavioral (smoking, alcohol, and other drugs use, unhealthy diet, poor sleep, physical inactivity), and metabolic factors (overweight/obesity, elevated blood pressure, poor lipid profile). We also looked for NCDs in adolescence like asthma, abnormal spirometry, depression, suicide risk, and poor oral health. The network was characterized by degree, betweenness, eigenvector, local transitivity, Shannon entropy, and cluster coefficient.

RESULTS

The adolescents had an average age of 18.3 years, 52.3% were female and 47.7% male. 99.8% of them have a diet rich in free sugars, 15% are overweight/obese and 72.3% had an elevated TyG index. High free sugar emerged as the central hub, followed by high TyG index (an early marker of insulin resistance) and low socioeconomic class. In males, low fiber intake and a high triglycerides/HDL ratio highlighted cardiometabolic concerns; in females, sedentary behavior and poor sleep marked metabolic and psychological challenges, along with caries in both sexes.

CONCLUSIONS

Our findings provide insights into central health challenges during adolescence, such as high free sugars, insulin resistance, and low socioeconomic indicators, suggesting that interventions targeted at these central hubs could have a significant impact on their NCD network.

Assessing the Correlation between Allostatic Load and False-Positive Image-Guided Breast Biopsies

Background: Allostatic load (AL) is the accumulation of physiological dysregulation attributed to repeated activation of the stress response over a lifetime. We assessed the utility of AL as a prognostic measure for high-risk benign breast biopsy pathology results. Method: Eligible patients were women 18 years or older, with a false-positive outpatient breast biopsy between January and December 2022 at a tertiary academic health center. AL was calculated using 12 variables representing four physiological systems: cardiovascular (pulse rate, systolic and diastolic blood pressures, total cholesterol, high-density lipoprotein, and low-density lipoprotein); metabolic (body mass index, albumin, and hemoglobin A1C); renal (creatinine and estimated glomerular filtration rate); and immune (white blood cell count). Multivariable logistic regression was used to assess the association between AL before biopsy and breast biopsy outcomes controlling for patients' sociodemographics. Results: In total, 170 women were included (mean age, 54.1 ± 12.9 years): 89.4% had benign and 10.6% had high-risk pathologies (radial scar/complex sclerosing lesion, atypical ductal or lobular hyperplasia, flat epithelial atypia, intraductal papilloma, or lobular carcinoma in-situ). A total of 56.5% were White, 24.7% Asian, and 17.1% other races. A total of 32.5% identified as Hispanic. The mean breast cancer risk score using the Tyrer-Cuzick model was 11.9 ± 7.0. In multivariable analysis, with every one unit increase in AL, the probability of high-risk pathology increased by 37% (odds ratio, 1.37; 95% confidence interval, 1.03, 1.81; p = 0.03). No significant association was seen between high-risk pathology and age, ethnicity, breast cancer risk, or area deprivation index. Conclusion: Our findings support that increased AL, a biological marker of stress, is associated with high-risk pathology among patients with false-positive breast biopsy results.

Allostatic Load, Morbidity, and Mortality Among Older Adults: A Multi-Wave Analysis From the National Health and Aging Trends Study

Although allostatic load (AL) is a key concept to reflect physiologic wear and tear from stress, older adults are underrepresented in AL-related research, especially the oldest old (≥80). Further, attenuative factors are often unaccounted for. This longitudinal analysis using data from National Health and Aging Trends Study investigated relationships of AL in 2017 and multi-wave (1) comorbidity accumulation using multilevel Poisson modeling and (2) mortality risk using survival analysis. By year five (2022), each incremental AL increase that older adults (n = 3614) experienced was associated with a 47% increase in comorbidity (p < .001), and a 33% increased mortality risk (p < .001). This research supports a shift to a more proactive, health promotion/risk mitigation paradigm through informing intervention research targeting AL, which is currently scarce. Identifying potentially modifiable and key driving factors influencing the relationship between AL and health among older adults is an important next step to inform intervention design.

The physiological toll of arrests: An examination of arrest history on midlife allostatic load

PURPOSE

To understand how allostatic load - cumulative physiologic burden of stress - varies by amount and timing of arrests stratified by race/ethnicity and by sex.

METHODS

Using The National Longitudinal Study of Adolescent to Adult Health, we calculated descriptive statistics and mean differences in bio-marker measured allostatic load by arrest history stratified by race/ethnicity and sex.

RESULTS

One-third of participants experienced at least one arrest, and most experienced arrests only as adults. Allostatic load scores were higher for those that had ever experienced an arrest compared to never (mean difference: 0.58 (0.33, 0.84)). Similar results held for men and women and across race/ethnicity, but Black non-Hispanic individuals had higher allostatic load at all levels compared to other individuals.

CONCLUSIONS

Experiencing both any arrest and multiple arrests were associated with higher allostatic load. The stress of arrests may contribute to physiological maladaptations and poor health. The public health and law enforcement fields must recognize the detrimental consequences of arrests on physiological stress and search for non-carceral solutions.

Enriched housing differentially alters allostatic load and cardiopulmonary responses to wildfire-related smoke in male and female mice

Living conditions are an important modifier of individual health outcomes and may lead to higher allostatic load (AL). However, housing-induced cardiovascular and immune effects contributing to altered environmental responsiveness remain understudied. This investigation was conducted to examine the influence of enriched (EH) versus depleted housing (DH) conditions on cardiopulmonary functions, systemic immune responses, and allostatic load in response to a single wildfire smoke (WS) exposure in mice. Male and female C57BL/6J mice were divided into EH or DH for 22 weeks, and cardiopulmonary assessments measured before and after exposures to either one-hr filtered air (FA) or flaming eucalyptus WS exposure. Male and female DH mice exhibited increased heart rate (HR) and left ventricular mass (LVM), as well as reduced stroke volume and end diastolic volume (EDV) one week following exposure to WS. Female DH mice displayed significantly elevated levels of IL-2, IL-17, corticosterone and hemoglobin A1c (HbA1c) following WS, while female in EH mice higher epinephrine levels were detected. Female mice exhibited higher AL than males with DH, which was potentiated post-WS exposure. Thus, DH increased susceptibility to extreme air pollution in a gender-dependent manner suggesting that living conditions need to be evaluated as a modifier of toxicological responses.

Allostatic Load and Depression Symptoms in Cancer Survivors: A National Health and Nutrition Examination Survey Study

BACKGROUND

Individuals with cancer often experience stress throughout the cancer trajectory and have a high risk of experiencing depression.

OBJECTIVE

The aim of this study was to examine the relationship between allostatic load (AL), a measure of cumulative stress-related physiologic dysregulation of different body systems, and symptoms of depression in cancer survivors.

METHODS

Participants were 294 adult cancer survivors from the US National Health and Nutrition Examination Survey (NHANES 2007-2018). Allostatic load was measured using 14 indicators representing cardiometabolic risk, glucose metabolism, cardiopulmonary functioning, parasympathetic functioning, and inflammation. Depressive symptoms were measured with the Patient Health Questionnaire-9. The relationship between AL and depressive symptoms was investigated using multiple regression adjusted for diverse sociodemographic and diagnosis variables.

RESULTS

Higher AL was associated with higher depressive symptom scores. The higher risk of depression was concentrated among those survivors in the highest AL quartile, with 21% (95% confidence interval, 11%-32%) of survivors presenting a high risk of depression compared with 8% to 11% of survivors in the lower quartiles. In exploratory analyses, the relationship between AL and depressive symptoms was only significant among survivors with a lower income. In contrast, in survivors in the highest income group, depressive symptoms were lower and unrelated to AL.

CONCLUSION

High AL is associated with more depressive symptoms among cancer survivors.

IMPLICATIONS FOR PRACTICE

Nurses have an important role in identifying psychological distress in cancer patients and survivors. Further research is needed to investigate the usefulness of AL as a marker in the context of cancer follow-up care and screening for psychological distress.

AACR Cancer Disparities Progress Report 2024: Achieving the Bold Vision of Health Equity

Advances in cancer prevention, early detection, and treatments have led to unprecedented progress against cancer. However, these advances have not benefited everyone equally. Because of a long history of structural inequities and systemic injustices in the United States, many segments of the US population continue to shoulder a disproportionate burden of cancer. The American Association for Cancer Research (AACR) Cancer Disparities Progress Report 2024 (CancerDisparitiesProgressReport.org) outlines the recent progress against cancer disparities, the ongoing challenges faced by medically underserved populations, and emphasizes the vital need for further advances in cancer research and patient care to benefit all populations.

Associations between allostatic load and hepatic steatosis and liver fibrosis: evidence from NHANES 2017-2020

BACKGROUND

Allostatic load, the cumulative strain resulting from chronic stress responses, has been linked to disease occurrence and progression, yet research quantifying this relationship is limited. This study aimed to explore the relationship between allostatic load score (ALS) levels and the degree of hepatic steatosis and fibrosis.

METHODS

Data from the National Health and Nutrition Examination Survey 2017-2020 were analyzed. The ALS was based on the statistical distribution, assigning one point for each biomarker if it was in the highest risk quartile, and then summing them to generate the ALS score (range, 0-8). The multivariate linear regression was employed to analyze the association between the controlled attenuation parameter (CAP) and liver stiffness measurement (LSM) with ALS. Additionally, multinomial logistic regression was used to investigate the association between ALS and the degree of hepatic steatosis and fibrosis.

RESULTS

Participants had a weighted mean age of 52.69 years and 56.14% were female. In the multivariate linear regression analysis, ALS showed a significant positive correlation with CAP (β = 15.56, 95% CI: 14.50-16.62) and LSM (β = 0.58, 95% CI: 0.48-0.67). Age, healthy dietary level, and PIR had significant interactions with this positive correlation. In the multinomial logistic regression analysis, ALS exhibited a significant positive correlation with different degrees of hepatic steatosis and fibrosis. Consistency of the results was observed in sensitivity analyses using clinical thresholds of ALS.

CONCLUSIONS

Comprehensive clinical assessment targeting load adaptation may enhance the effectiveness of risk assessment in patients with hepatic steatosis and fibrosis.

Impact of baseline and longitudinal allostatic load changes on incident cardiovascular disease and all-cause mortality: A 7-year population-based cohort study in China

BACKGROUND

We aimed to prospectively examine the association of baseline allostatic load (AL) and longitudinal AL changes with incident cardiovascular disease (CVD) and all-cause mortality among middle-aged and elderly Chinese populations and evaluate the relative contributions of each physiological system of AL.

METHODS

Data from the China Health and Retirement Longitudinal Study (CHARLS) among adults aged 45 years or older were analyzed. Cox regression models were used to estimate the hazard ratios (HRs) and 95 % confidence intervals (95 % CIs) for the associations between baseline AL/longitudinal AL changes with incident CVD and all-cause mortality.

RESULTS

Compared with adults with AL 0-1, HRs of those with baseline AL 2-3 and AL ≥ 4 were 1.24 (95 % CI: 1.06, 1.45) and 1.51 (95 % CI: 1.27, 1.80) for incident CVD, and 1.39 (95 % CI: 1.11, 1.75) and 2.02 (95 % CI: 1.60, 2.54) for all-cause mortality. Similar results were found when we treated baseline AL as a continuous variable. We also found per AL score increase during 4 years of follow-up was related to a 11 % (HR, 1.11; 95 % CI: 1.03, 1.20) and 21 % (HR, 1.21; 95 % CI: 1.10, 1.34) increase in incident CVD and all-cause mortality, respectively.

LIMITATIONS

Self-reported physician-diagnosed CVD was used to assess the incident CVD.

CONCLUSIONS

Both baseline AL and longitudinal increases in AL were positively associated with incident CVD and all-cause mortality in middle-aged and elderly adults. Individuals with high AL need to be dynamically monitored for CVD and pre-mature mortality prevention.

Daily spiritual experiences and allostatic load trajectories: a longitudinal study of midlife African American women

OBJECTIVE

This study aimed to evaluate the association between daily spiritual experiences and allostatic load (AL) trajectories in midlife African American women.

METHODS

A longitudinal analysis of public-use data from 727 African American women in the Study of Women's Health Across the Nation (SWAN) was performed. We included African American women who completed the Daily Spiritual Experiences Scale at SWAN visit 4 (2000-2001) and had AL data at three or more study visits over 7 years. AL was calculated at each visit using 10 biomarkers: systolic and diastolic blood pressure, body mass index, C-reactive protein, high-density lipoprotein cholesterol, total cholesterol, waist-to-hip ratio, fasting serum glucose, triglycerides, and dehydroepiandrosterone. Group-based trajectory modeling identified women with similar patterns of AL. We used multinomial logistic regression to estimate associations between daily spiritual experiences (some days or less, most days, daily, many times a day) and AL trajectories.

FINDINGS

Our sample had a mean ± SD age of 49.9 ± 2.66 years, 47% were early perimenopausal, and 17% earned <$19,999 annually. The mean ± SD AL score was 2.52 ± 1.68. Three AL trajectories were identified: low (35.1%), moderate (44.7%), and high (20.2%). In age-adjusted models, women who reported daily comfort in religion and spirituality were less likely to follow a high AL trajectory (odds ratio, 0.41; 95% CI, 0.18-0.93); the association was attenuated when controlling for depressive symptoms (odds ratio, 0.48; 95% CI, 0.19-1.21).

CONCLUSIONS

Findings from this study do not support an independent association between spirituality in African American women and AL trajectories in midlife. Studies with a larger sample and additional measures of spirituality are warranted in this population.

Influence of Healthcare Delivery Type on Patients' Mental Health: Is Hospitalization Always a Stressful Factor? Can Allostatic Load Help Assess a Patient's Psychological Disorders?

BACKGROUND

Psychological distress is a predictor of future health and disease data, with consequent implications for both the patient and the healthcare system. Taking advantage of the unprecedented situation caused by the COVID-19 pandemic we aimed to assess whether the type of medical care received by patients during the initial months of the pandemic influenced their evolution, particularly at the psychological level. Additionally, we investigated whether allostatic load was associated not only with physical but also psychological alterations.

METHODS

All the patients diagnosed with COVID-19 infection at HM Madrid Hospital during the month of March 2020 were studied, both those hospitalized (110) and those treated on an outpatient basis (46). They were psychologically evaluated using the Profile of Mood States (POMS) test. We calculated the allostatic load using different laboratory parameters.

RESULTS

Outpatient patients had significantly higher scores than hospitalized ones in Tension-Anxiety (52 ± 19.3 vs. 38 ± 4.3; p < 0.001). So, 36.9% of the outpatient patients exhibited anxiety. Allostatic load has not been correlated with patients' psychological alterations.

CONCLUSIONS

Psychological distress of outpatient patients should be taken into account in their management to improve mental health planning. This knowledge could provide comprehensive care to patients including their mental health, in the face of subsequent epidemics/pandemics.

Patterns of Avoidance Behavior in Response to Fear of Victimization in the Mexican Context: A Latent Class Analysis

Fear of victimization (FOV) is a powerful determinant of behavior and prompts behavioral responses such as avoidance, associated with a decline in health-promoting activities and quality of life. Avoidance behaviors, which include constraining activities to perceived safe areas and avoiding areas regarded as unsafe, are of particular interest due to their high prevalence as a coping response to FOV and their link to adverse physical and mental health. Most research on FOV-related avoidance treats it as a single construct and have yet to elucidate the potential heterogeneity within this set of behaviors. We argue that such approach could mask potential heterogeneity among people who respond to FOV through avoidance and how they adapt to manage perceived risk. Our analysis extends the foundational knowledge regarding FOV-related avoidance using a person-centered approach. We attempted to capture distinct profiles across avoidance behaviors and how they are shaped by physical and social vulnerabilities. Data from the 2021 Mexico's National Survey of Victimization and Perception of Security Survey (n = 83,696) was analyzed using Latent Class Analysis focusing on 15 avoidance behaviors (e.g., stopped using public transportation). We conducted multinomial logistic regression to test whether age, gender, education, and neighborhood deprivation significantly predicted class membership. Findings revealed three classes: avoidant (most behavioral adjustments across the board), cautious (only adapted some behaviors), and protective (least behavioral adjustments, but more concerned about minors in their households). The results supported the hypothesized associations between age, gender, education, and neighborhood deprivation with group membership, but the significance differed by group. This research underscores the role of environmental context in shaping individual perceptions of safety and avoidance behavior. Finally, contrary to the approach of treating avoidance behavior as a single category, these findings present a more complex picture as distinct and meaningful patterns emerged across the three groups.

Understanding the Cardiovascular and Metabolic Health Effects of Air Pollution in the Context of Cumulative Exposomic Impacts

Poor air quality accounts for more than 9 million deaths a year globally according to recent estimates. A large portion of these deaths are attributable to cardiovascular causes, with evidence indicating that air pollution may also play an important role in the genesis of key cardiometabolic risk factors. Air pollution is not experienced in isolation but is part of a complex system, influenced by a host of other external environmental exposures, and interacting with intrinsic biologic factors and susceptibility to ultimately determine cardiovascular and metabolic outcomes. Given that the same fossil fuel emission sources that cause climate change also result in air pollution, there is a need for robust approaches that can not only limit climate change but also eliminate air pollution health effects, with an emphasis of protecting the most susceptible but also targeting interventions at the most vulnerable populations. In this review, we summarize the current state of epidemiologic and mechanistic evidence underpinning the association of air pollution with cardiometabolic disease and how complex interactions with other exposures and individual characteristics may modify these associations. We identify gaps in the current literature and suggest emerging approaches for policy makers to holistically approach cardiometabolic health risk and impact assessment.

A Smartphone App to Support Self-Management for People Living With Sjögren's Syndrome: Qualitative Co-Design Workshops

BACKGROUND

Sjögren's syndrome (SS) is the second most common autoimmune rheumatic disease, and the range of symptoms includes fatigue, dryness, sleep disturbances, and pain. Smartphone apps may help deliver a variety of cognitive and behavioral techniques to support self-management in SS. However, app-based interventions must be carefully designed to promote engagement and motivate behavior change.

OBJECTIVE

We aimed to explore self-management approaches and challenges experienced by people living with SS and produce a corresponding set of design recommendations that inform the design of an engaging, motivating, and evidence-based self-management app for those living with SS.

METHODS

We conducted a series of 8 co-design workshops and an additional 3 interviews with participants who were unable to attend a workshop. These were audio recorded, transcribed, and initially thematically analyzed using an inductive approach. Then, the themes were mapped to the Self-Determination Theory domains of competency, autonomy, and relatedness.

RESULTS

Participants experienced a considerable demand in the daily work required in self-managing their SS. The condition demanded unrelenting, fluctuating, and unpredictable mental, physical, and social efforts. Participants used a wide variety of techniques to self-manage their symptoms; however, their sense of competency was undermined by the complexity and interconnected nature of their symptoms and affected by interactions with others. The daily contexts in which this labor was occurring revealed ample opportunities to use digital health aids. The lived experience of participants showed that the constructs of competency, autonomy, and relatedness existed in a complex equilibrium with each other. Sometimes, they were disrupted by tensions, whereas on other occasions, they worked together harmoniously.

CONCLUSIONS

An SS self-management app needs to recognize the complexity and overlap of symptoms and the complexities of managing the condition in daily life. Identifying techniques that target several symptoms simultaneously may prevent users from becoming overwhelmed. Including techniques that support assertiveness and communication with others about the condition, its symptoms, and users' limitations may support users in their interactions with others and improve engagement in symptom management strategies. For digital health aids (such as self-management apps) to provide meaningful support, they should be designed according to human needs such as competence, autonomy, and relatedness. However, the complexities among the 3 Self-Determination Theory constructs should be carefully considered, as they present both design difficulties and opportunities.

Associations of allostatic load with sociodemographic factors, depressive symptoms, lifestyle, and health characteristics in a large general population-based sample

OBJECTIVE

We examined the associations between allostatic load (AL) and sociodemographic factors, depressive symptoms, lifestyle and health characteristics in a population-based sample of 4993 adults in Finland.

METHODS

Thirteen biomarkers were used to construct AL. High AL was defined as scoring highly in ≥4 items.

RESULTS

AL scores of 4 and above were exceeded in the age group of 45-54 years in men and 65-74 years in women. Age was the strongest predictor for belonging to the high AL score group. In addition, elevated depressive symptoms (BDI-6 ≥ 4), male sex, not engaging in physical exercise, high alcohol use and a low level of education were associated with an increased likelihood of belonging to the high AL group.

CONCLUSION

The older the participants were, the greater their AL burden was. However, AL burden increased more steeply as a function of age in men. In addition to lifestyle interventions, effective prevention strategies for depression at the population level could have a major public health impact in reducing the accumulation of AL burden.

Neurological Health in Sexual and Gender Minority Individuals

Despite representing a significant proportion of the U.S. population, there is a paucity of population-based research on the health status and health needs of sexual and gender minority (SGM) individuals in neurology. Compared with heterosexual peers, some SGM populations have a higher burden of chronic health conditions. In parallel, SGM individuals are more likely to experience stigma and discrimination producing psychological distress, which may contribute to and be compounded by reduced health care access and utilization. In this narrative review, we summarize the existing literature on common neurological health conditions such as stroke, headache, epilepsy, movement disorders, and traumatic brain injury through the lens of intersection of SGM identity. Special focus is attuned to social determinants of health and gender-affirming hormonal therapy. Given the limitations in the available literature, there is an urgent unmet need for datasets that include sexual orientation and gender identity information, as well as funding for research that will characterize the prevalence of neurological conditions, unique risk factors, and health outcomes in SGM populations. In the health care community, providers should address deficiencies in their professional training and integrate inclusive language into their clinical skillset to build trust with SGM patients. There is an opportunity in neurology to proactively engage SGM communities, collaborate to remove barriers to care, promote resilience, and develop targeted interventions to ensure high-quality, culturally competent care for SGM populations to improve neurological health for all.

Lead exposure, glucocorticoids, and physiological stress across the life course: A systematic review

The biological pathways linking lead exposure to adverse outcomes are beginning to be understood. Rodent models suggest lead exposure induces dysfunction within the hypothalamic-pituitary-adrenal (HPA) axis and glucocorticoid regulation, a primary physiological stress response system. Over time, HPA axis and glucocorticoid dysfunction has been associated with adverse neurocognitive and cardiometabolic health, much like lead exposure. This systematic review utilized PRISMA guidelines to synthesize the literature regarding associations between lead exposure and downstream effector hormones of the HPA axis, including cortisol, a glucocorticoid, and dehydroepiandrosterone (DHEA), a glucocorticoid antagonist. We additionally determined the state of the evidence regarding lead exposure and allostatic load, a measure of cumulative body burden resultant of HPA axis and glucocorticoid dysfunction. A total of 18 articles were included in the review: 16 assessed cortisol or DHEA and 3 assessed allostatic load. Generally, the few available child studies suggest a significant association between early life lead exposure and altered cortisol, potentially suggesting the impact of developmental exposure. In adulthood, only cross sectional studies were available. These reported significant associations between lead and reduced cortisol awakening response and increased cortisol reactivity, but few associations with fasting serum cortisol. Two studies reported significant associations between increasing lead exposure and allostatic load in adults and another between early life lead exposure and adolescent allostatic load. The paucity of studies examining associations between lead exposure and allostatic load or DHEA and overall heterogeneity of allostatic load measurements limit conclusions. However, these findings cautiously suggest associations between lead and dysregulation of physiological stress pathways (i.e., glucocorticoids) as seen through cortisol measurement in children and adults. Future research would help to elucidate these associations and could further examine the physiological stress pathway as a mediator between lead exposure and detrimental health outcomes.

Associations between adverse childhood experiences and history of weight cycling

Background

Adverse childhood experiences (ACEs) predict obesity onset; however, the relationship between ACEs and history of weight cycling has not been adequately explored. This gap is problematic given the difficulty in weight loss maintenance and the impact of ACEs on obesity development, chronicity, and associated weight stigma. The objective of this study was to examine associations between self-reported history of ACEs and weight cycling in a sample of weight loss treatment-seeking adults with overweight/obesity.

Methods

The number of participants in the analyzed sample was 78, mostly white educated adult women (80% female, 81% Caucasian, 75% ≥ bachelor's degree) with excess adiposity enrolled in the Cognitive and Self-regulatory Mechanisms of Obesity Study. ACEs were measured at baseline using the ACEs Scale. History of weight cycling was measured using the Weight and Lifestyle Inventory that documented weight loss(es) of 10 or more pounds.

Results

Higher ACE scores were associated with a greater likelihood of reporting a history of weight cycling. Participants with four or more ACEs had 8 times higher odds (OR = 8.301, 95% CI = 2.271-54.209, p = 0.027) of reporting weight cycling compared with participants with no ACEs. The association of weight cycling for those who endorsed one to three ACEs was not significant (OR = 2.3, 95% CI = 0.771-6.857, p = 0.135) in this sample.

Conclusions

The role of ACEs in health may be related to associations with weight cycling. Results indicated that those who reported four or more ACEs had significantly higher odds of reporting weight cycling compared with those with no ACEs. Further research is needed to further explore how ACEs predict the likelihood of weight cycling, which may be prognostic for sustained weight loss treatment response and weight stigma impacts.

Effort-reward and overcommitment at work and psychiatric symptoms in healthcare professionals: The mediation role of allostatic load

Background

Despite decades of advancement to support interventions for managing work-related stress, mental health issues have significantly escalated among healthcare professionals. Effort-reward imbalance (ERI) and overcommitment in the workplace are linked to several psychiatric disorders. However, the underlying biological mechanisms remain unclear. This study investigated whether ERI and overcommitment among healthcare professionals were linked to Allostatic Load (AL) and whether AL mediates the relationship between ERI, overcommitment and mental health issues.

Methods

One hundred forty-two nursing workers (n = 142; 90.1 % female, mean age: 39.5 ± 9.6) were randomly recruited from a university hospital in Sao Paulo, Brazil, and applied the ERI scale that assesses work effort, reward, and overcommitment. The Perceived Stress Scale (PSS), The Beck Depression Inventory (BDI), and the Self-Report Questionnaire for psychiatric symptoms (SRQ-20) evaluated the mental health outcomes. Ten neuroendocrine, metabolic, immunologic and cardiovascular biomarkers were analyzed, and values were transformed into an AL index using clinical reference cutoffs.

Results

Linear regression adjusted for covariates showed that higher scores for overcommitment were associated with higher AL indexes, which in turn were associated with higher SRQ-20, but not with PSS and DBI scores. As expected, higher scores for effort, lower for reward, and higher ERI were associated with higher scores for PSS, SRQ-20, and DBI, but not with AL index. Direct effect estimates showed that overcommitment was directly associated with higher SRQ-20 scores, and indirectly via AL.

Conclusion

Our study reveals that overcommitment, rather than ERI, was linked to increased AL in healthcare workers. Additionally, AL mediates the relationship between overcommitment and higher psychiatric symptoms, highlighting a key mechanism by which work stress can lead to mental health problems. Individual's responses to high work demands need to be considered when designing predictive models and interventions for mental health issues.

Self-Reported Health as Predictor of Allostatic Load and All-Cause Mortality: Findings From the Lolland-Falster Health Study

Objectives: The aim was to determine the association between self-reported health (SRH), allostatic load (AL) and mortality. Methods: Data derived from the Lolland-Falster Health Study undertaken in Denmark from 2016-2020 (n = 14,104). Median follow-up time for death was 4.6 years where 456 participants died. SRH was assessed with a single question and AL by an index of ten biomarkers. Multinomial regression analysis were used to examine the association between SRH and AL, and Cox regression to explore the association between SRH, AL and mortality. Results: The risk of high AL increased by decreasing level of SRH. The ratio of relative risk (RRR) of having medium vs. low AL was 1.58 (1.11-2.23) in women reporting poor/very poor SRH as compared with very good SRH. For men it was 1.84 (1.20-2.81). For high vs. low AL, the RRR was 2.43 (1.66-3.56) in women and 2.96 (1.87-4.70) in men. The hazard ratio (HR) for all-cause mortality increased by decreasing SRH. For poor/very poor vs. very good SRH, the HR was 6.31 (2.84-13.99) in women and 3.92 (2.12-7.25) in men. Conclusion: Single-item SRH was able to predict risk of high AL and all-cause mortality.

Association between allostatic load and breast cancer risk: a cohort study

BACKGROUND

Allostatic load (AL) reflects the collective load of chronic stress during lifetime. Previous studies have shown that higher AL is associated with poor clinical outcomes among breast cancer patients. However, the relationship between AL and breast cancer risk is still unclear.

METHODS

To fill the gap, we analyzed the association between AL and the development of breast cancer in 181,455 women identified from the UK Biobank.

RESULTS

During the follow-up from 2006 to 2020, 5,701 women were diagnosed with incident breast cancer. Significantly higher AL was observed among incident breast cancer cases than all study participants (mean: 2.77 vs. 2.63, P < 0.01). Univariate Cox regression analysis indicated the risk of breast cancer was increased by 5% per one AL unit increase (hazard ratio (HR) = 1.05, 95% confidence interval (CI) 1.04, 1.07). In multivariate analyses, after adjusting demographics, family history of breast cancer, reproductive factors, socioeconomic status, lifestyle factors, and breast cancer polygenic risk score (PRS), the significant association remained (HR = 1.05, 95%CI 1.03, 1.07). The significant relationship was further confirmed in the categorical analysis. Compared with women in the low AL group (AL: 0 ~ 2), those in the high AL group (AL: 3 ~ 11) had a 1.17-fold increased risk of breast cancer (HR = 1.17, 95%CI 1.11, 1.24). Finally, in the stratified analysis, joint effects on the risk of breast cancer were observed between the AL and selected known breast cancer risk factors, including age, family history of breast cancer, PRS, income, physical activity, and alcohol consumption.

CONCLUSION

In summary, those findings have demonstrated that higher AL was associated with an increased breast cancer risk in women. This association is likely independent of known breast cancer risk factors. Thus, the AL could be a valuable biomarker to help breast cancer risk prediction and stratification.