{
  "schemaVersion": 1,
  "capturedAt": "2026-09-14T11:41:53.498Z",
  "sha256": "b0327c3ac31c5b6e944a106db6153c868282ed3c0e8e9abd33121ac63c3d2668",
  "work": {
    "id": "TAP-CON-0004",
    "kind": "concept",
    "key": "allostatic-load",
    "locale": "en",
    "path": "/topics/allostatic-load/",
    "title": "Allostatic Load",
    "description": "Allostatic load describes the cumulative physiological costs that may accompany repeated or prolonged adaptation. It connects long-term challenges with changes across multiple bodily systems.",
    "rights": "© The Allostasis Project. All rights reserved. Reproduction or adaptation requires separate permission, subject to applicable legal exceptions.",
    "version": "0.2",
    "updatedAt": "2026-09-14",
    "editorial": {
      "contentType": "scientific-concept",
      "reviewState": "draft",
      "reviewedAt": null,
      "reviewedVersion": null,
      "updatedAt": "2026-09-14",
      "version": "0.2",
      "author": null,
      "reviewer": null,
      "revisions": [
        {
          "date": "2026-09-14",
          "version": "0.2",
          "description": "Added biomarker harmonization, mortality synthesis and Chinese longitudinal evidence, distinguishing association from intervention benefit."
        }
      ]
    },
    "sections": [
      {
        "id": "introduction",
        "title": "At a glance",
        "paragraphs": [
          "Repeated adaptation may carry a cost.",
          "Allostatic load describes the cumulative physiological costs that may accompany repeated or prolonged adaptation. It connects long-term challenges with changes across multiple bodily systems.",
          "This is a research concept. Fatigue alone, or a single indicator, cannot establish it."
        ]
      },
      {
        "id": "cost",
        "title": "The possible cost of repeated adaptation",
        "paragraphs": [
          "The allostatic-load framework connects repeated demands with cumulative physiological costs. Stress mediators can have protective as well as damaging effects, depending on the pattern and context of their activity.[1][2]"
        ]
      },
      {
        "id": "measurement",
        "title": "A construct, with different measures",
        "paragraphs": [
          "A review of reviews documented variation in the measures used to operationalise allostatic load. A study's biomarker panel, thresholds and population matter when interpreting its index.[3]",
          "The biomarker tradition spans neuroendocrine, immune, metabolic and cardiovascular measures. A later analysis across 13 cohorts compared alternative configurations. These studies help explain how AL is operationalized; the resulting indices still need to be interpreted within their populations and methods.[4][5]"
        ]
      },
      {
        "id": "health-outcomes",
        "title": "From measurement to health outcomes",
        "paragraphs": [
          "A mortality meta-analysis found an association with higher AL, with substantial variation between studies. A Chinese CHARLS analysis also linked baseline AL and its change with subsequent cardiovascular disease and mortality in adults aged 45 and older. These are health associations, not estimates of how much benefit an intervention that lowers AL would produce.[6][7]"
        ]
      },
      {
        "id": "boundaries",
        "title": "Not a personal diagnosis",
        "paragraphs": [
          "This hub does not translate tiredness or a single test result into allostatic load. The linked feature explains the concept and its measurement limits in more detail."
        ]
      }
    ],
    "references": [
      {
        "id": "mcewen-1993",
        "title": "Stress and the individual. Mechanisms leading to disease",
        "authors": "Bruce S. McEwen · Eliot Stellar",
        "journal": "Archives of Internal Medicine",
        "year": "1993",
        "url": "https://pubmed.ncbi.nlm.nih.gov/8379800/",
        "doi": "10.1001/archinte.1993.00410180039004",
        "pmid": "8379800"
      },
      {
        "id": "mcewen-1998",
        "title": "Protective and damaging effects of stress mediators",
        "authors": "Bruce S. McEwen",
        "journal": "New England Journal of Medicine",
        "year": "1998",
        "url": "https://pubmed.ncbi.nlm.nih.gov/9428819/",
        "doi": "10.1056/NEJM199801153380307",
        "pmid": "9428819"
      },
      {
        "id": "measurement-review",
        "title": "Allostatic Load Measurement: A Systematic Review of Reviews, Database Inventory, and Considerations for Neighborhood Research",
        "authors": "Shawna Beese · Julie Postma · Janessa M. Graves",
        "journal": "International Journal of Environmental Research and Public Health",
        "year": "2022",
        "url": "https://pubmed.ncbi.nlm.nih.gov/36554888/",
        "doi": "10.3390/ijerph192417006",
        "pmid": "36554888"
      },
      {
        "id": "juster-2010",
        "title": "Allostatic load biomarkers of chronic stress and impact on health and cognition",
        "authors": "Robert-Paul Juster · Bruce S. McEwen · Sonia J. Lupien",
        "journal": "Neuroscience & Biobehavioral Reviews",
        "year": "2010",
        "url": "https://doi.org/10.1016/j.neubiorev.2009.10.002",
        "doi": "10.1016/j.neubiorev.2009.10.002",
        "pmid": "19822172"
      },
      {
        "id": "mccrory-2023",
        "title": "Towards a consensus definition of allostatic load: a multi-cohort, multi-system, multi-biomarker individual participant data (IPD) meta-analysis",
        "authors": "Cathal McCrory · Sinead McLoughlin · Richard Layte · Cliona NiCheallaigh · Aisling M. O’Halloran · Henrique Barros · Lisa F. Berkman · Murielle Bochud · Eileen M. Crimmins · Meagan T. Farrell · Silvia Fraga · Emily Grundy · Michelle Kelly-Irving · Dusan Petrovic · Teresa Seeman · Silvia Stringhini · Peter Vollenveider · Rose Anne Kenny",
        "journal": "Psychoneuroendocrinology",
        "year": "2023",
        "url": "https://doi.org/10.1016/j.psyneuen.2023.106117",
        "doi": "10.1016/j.psyneuen.2023.106117",
        "pmid": "37100008"
      },
      {
        "id": "parker-2022",
        "title": "Allostatic Load and Mortality: A Systematic Review and Meta-Analysis",
        "authors": "Haley W. Parker · Alyssa M. Abreu · Mary C. Sullivan · Maya K. Vadiveloo",
        "journal": "American Journal of Preventive Medicine",
        "year": "2022",
        "url": "https://doi.org/10.1016/j.amepre.2022.02.003",
        "doi": "10.1016/j.amepre.2022.02.003",
        "pmid": "35393143"
      },
      {
        "id": "li-2024",
        "title": "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",
        "authors": "Yachao Li · Chu Chen · Ying Wen · Xiuli Wang · Ziqian Zeng · Hongying Shi · Xiaofang Chen · Ruichan Sun · Qingping Xue",
        "journal": "Journal of Affective Disorders",
        "year": "2024",
        "url": "https://doi.org/10.1016/j.jad.2024.03.124",
        "doi": "10.1016/j.jad.2024.03.124",
        "pmid": "38548202"
      }
    ],
    "type": "CON"
  }
}