Cited by 62Tryptophan and brain disordersStress Responses and CortisolEvolutionary Psychology and Human Behavior

Depression as sickness behavior? A test of the host defense hypothesis in a high pathogen population

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Stieglitz, Jonathan, Trumble, Benjamin C., Thompson, Melissa Emery, Blackwell, Aaron D., Kaplan, Hillard, Gurven, Michael·2015·Brain, Behavior, and Immunity

Abstract

Sadness is an emotion universally recognized across cultures, suggesting it plays an important functional role in regulating human behavior. Numerous adaptive explanations of persistent sadness interfering with daily functioning (hereafter "depression") have been proposed, but most do not explain frequent bidirectional associations between depression and greater immune activation. Here we test several predictions of the host defense hypothesis, which posits that depression is part of a broader coordinated evolved response to infection or tissue injury (i.e. "sickness behavior") that promotes energy conservation and reallocation to facilitate immune activation. In a high pathogen population of lean and relatively egalitarian Bolivian forager-horticulturalists, we test whether depression and its symptoms are associated with greater baseline concentration of immune biomarkers reliably associated with depression in Western populations (i.e. tumor necrosis factor alpha [TNF-α], interleukin-1 beta [IL-1β], interleukin-6 [IL-6], and C-reactive protein [CRP]). We also test whether greater pro-inflammatory cytokine responses to ex vivo antigen stimulation are associated with depression and its symptoms, which is expected if depression facilitates immune activation. These predictions are largely supported in a sample of older adult Tsimane (mean±SD age=53.2±11.0, range=34-85, n=649) after adjusting for potential confounders. Emotional, cognitive and somatic symptoms of depression are each associated with greater immune activation, both at baseline and in response to ex vivo stimulation. The association between depression and greater immune activation is therefore not unique to Western populations. While our findings are not predicted by other adaptive hypotheses of depression, they are not incompatible with those hypotheses and future research is necessary to isolate and test competing predictions.

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Authors
Stieglitz, J., Trumble, B. C., Thompson, M. E., Blackwell, A. D., Kaplan, H., & Gurven, M.
Affiliations
  • University of New Mexico (US)
  • University of California, Santa Barbara (US)
Corresponding author
Stieglitz, Jonathan
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2015-10
Volume
49
Pages
130-139
ISSN
0889-1591 (ISSN-L)
OpenAlex
W1639240385
Cited by
62
References
75
Citations by year
2026: 1 · 2025: 6 · 2024: 6 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 4 · 2019: 3 · 2018: 10 · 2017: 6 · 2016: 8 · 2015: 2
FWCI
2.92
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Chapman University Digital Commons (Chapman University) (submittedVersion, cc-by-nc-nd)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health/National Institute on Aging (R01AG024119, R56AG024119)
  • Agence Nationale de la Recherche
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Evolutionary Psychology and Human Behavior
Keywords
depression, sickness behavior, immune activation, inflammatory cytokines, C-reactive protein, TNF-α, IL-1β, interleukin-6, Tsimane, forager-horticulturalists, adaptive function of emotions, older adults
MeSH terms
Bolivia, C-Reactive Protein, Depressive Disorder, Female, Humans, Immunologic Factors, Male, Middle Aged, Biomarkers, Cytokines, Host-Pathogen Interactions, Illness Behavior

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