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Chronic stress and obesity: A new view of “comfort food”

Mary F. Dallman, Norman Pecoraro, Susan F. Akana, Susanne E. la Fleur, Francisca Gomez, Hani Houshyar, M. E. Bell, Seema Bhatnagar, Kevin D. Laugero, and Sotara Manalo
PNAS September 30, 2003 100 (20) 11696-11701; https://doi.org/10.1073/pnas.1934666100
Mary F. Dallman
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Norman Pecoraro
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Susan F. Akana
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Susanne E. la Fleur
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Francisca Gomez
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Hani Houshyar
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M. E. Bell
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Seema Bhatnagar
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Kevin D. Laugero
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Sotara Manalo
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  1. Communicated by Bruce S. McEwen, The Rockefeller University, New York, NY, July 28, 2003 (received for review May 14, 2003)

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Abstract

The effects of adrenal corticosteroids on subsequent adrenocorticotropin secretion are complex. Acutely (within hours), glucocorticoids (GCs) directly inhibit further activity in the hypothalamo–pituitary–adrenal axis, but the chronic actions (across days) of these steroids on brain are directly excitatory. Chronically high concentrations of GCs act in three ways that are functionally congruent. (i) GCs increase the expression of corticotropin-releasing factor (CRF) mRNA in the central nucleus of the amygdala, a critical node in the emotional brain. CRF enables recruitment of a chronic stress-response network. (ii) GCs increase the salience of pleasurable or compulsive activities (ingesting sucrose, fat, and drugs, or wheel-running). This motivates ingestion of “comfort food.” (iii) GCs act systemically to increase abdominal fat depots. This allows an increased signal of abdominal energy stores to inhibit catecholamines in the brainstem and CRF expression in hypothalamic neurons regulating adrenocorticotropin. Chronic stress, together with high GC concentrations, usually decreases body weight gain in rats; by contrast, in stressed or depressed humans chronic stress induces either increased comfort food intake and body weight gain or decreased intake and body weight loss. Comfort food ingestion that produces abdominal obesity, decreases CRF mRNA in the hypothalamus of rats. Depressed people who overeat have decreased cerebrospinal CRF, catecholamine concentrations, and hypothalamo–pituitary–adrenal activity. We propose that people eat comfort food in an attempt to reduce the activity in the chronic stress-response network with its attendant anxiety. These mechanisms, determined in rats, may explain some of the epidemic of obesity occurring in our society.

  • corticotropin-releasing factor
  • glucocorticoids
  • high fat
  • sucrose
  • motivation

Footnotes

    • ↵* To whom correspondence should be addressed. E-mail: dallman{at}itsa.ucsf.edu.

    • Abbreviations: ACTH, adrenocorticotropin; B, corticosterone; CRF, corticotropin-releasing factor; GC, glucocorticoid; HPA, hypothalamo–pituitary–adrenal; LC, locus coeruleus; PVN, paraventricular nuclei; mpPVN, medial parvicellular PVN; WAT, white adipose tissue.

    • Received May 14, 2003.
    • Copyright © 2003, The National Academy of Sciences
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    Chronic stress and obesity: A new view of “comfort food”
    Mary F. Dallman, Norman Pecoraro, Susan F. Akana, Susanne E. la Fleur, Francisca Gomez, Hani Houshyar, M. E. Bell, Seema Bhatnagar, Kevin D. Laugero, Sotara Manalo
    Proceedings of the National Academy of Sciences Sep 2003, 100 (20) 11696-11701; DOI: 10.1073/pnas.1934666100

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    Chronic stress and obesity: A new view of “comfort food”
    Mary F. Dallman, Norman Pecoraro, Susan F. Akana, Susanne E. la Fleur, Francisca Gomez, Hani Houshyar, M. E. Bell, Seema Bhatnagar, Kevin D. Laugero, Sotara Manalo
    Proceedings of the National Academy of Sciences Sep 2003, 100 (20) 11696-11701; DOI: 10.1073/pnas.1934666100
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      • Abstract
      • GC Effects on HPA Function: Acute and Chronic
      • Chronic Stress Recruits Activity in the Chronic Stress-Response Network
      • Systemic Effects of GCs
      • Sucrose Ingestion and Central B in Adrenalectomized Rats
      • GCs Act on Brain to Increase Stimulus Salience
      • Do the Effects of Chronic Stress and GCs in Rats Apply to Humans?
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