CMAJ 172(9): 1199-1209

Behavioural treatments for chronic systemic inflammation: effects of dietary weight loss and exercise training

From the Sticht Center on Aging, Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (Nicklas, You); the Department of Aging and Geriatric Research and the University of Florida Institute on Aging, University of Florida, Gainesville, Fla. (Pahor)

Abstract

PERSISTENT LOW-GRADE INFLAMMATION, as indicated by higher circulating levels of inflammatory mediators such as C-reactive protein, interleukin-6 and tumour necrosis factor-α, is a strong risk factor for several chronic diseases. There are data indicating that decreasing energy intake and increasing physical activity may be effective therapies for reducing overall inflammation. Evidence is strong that circulating levels of inflammatory markers are elevated with total and abdominal obesity, possibly owing to a higher secretion rate of cytokines by adipose tissue in obese people. Moreover, very-low-energy dietary weight loss reduces both circulating markers of inflammation and adipose-tissue cytokine production. Data from several large population-based cohorts show an inverse association between markers of systemic inflammation and physical activity or fitness status; small-scale intervention studies support that exercise training diminishes inflammation. Dietary weight loss plus exercise is likely more effective than weight reduction alone in reducing inflammation. To date, data from randomized, controlled trails designed to definitively test the effects of weight loss or exercise training, or both, on inflammation are limited. Future studies are required to define the amount of weight loss needed for clinically meaningful reductions of inflammation; in addition, fully powered and controlled studies are necessary to clarify the effect of exercise training on chronic, systemic inflammation.

Abstract

Acknowledgments

This work was supported in part by the Wake Forest University Claude D. Pepper Older Americans Independence Center (National Institute on Aging [NIA] grant P30-AG-021332) and NIA grant R01-AG/DK-20583.

Acknowledgments

Footnotes

This article has been peer reviewed.

Contributors: All of the authors made substantial contributions to the writing of the paper, including comprehensive review of the literature, interpretation of findings and drafting of the text and figures.

Competing interests: None declared.

Correspondence to:Barbara J. Nicklas, Section on Gerontology, Internal Medicine, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem NC 27157, USA; fax 336 713-8588;ude.cmbufw@salkcinb

Footnotes

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