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Public Health Nutr. 2014 Aug;17(8):1825-33. doi: 10.1017/S1368980013002565. Epub 2013 Oct 10.

A population-based dietary inflammatory index predicts levels of C-reactive protein in the Seasonal Variation of Blood Cholesterol Study (SEASONS).

Author information

1
1Cancer Prevention and Control Program,University of South Carolina,915 Greene Street,Suite 241,Columbia,SC 29208,USA.
2
2Department of Epidemiology and Biostatistics,Arnold School of Public Health,University of South Carolina,Columbia,SC,USA.
3
3Division of Preventive and Behavioral Medicine,Department of Medicine,University of Massachusetts Medical School,Worcester,MA,USA.
4
4Division of Cardiovascular Medicine,Department of Medicine,University of Massachusetts Medical School,Worcester,MA,USA.

Abstract

OBJECTIVE:

To perform construct validation of the population-based Dietary Inflammatory Index (DII) using dietary data from two different dietary assessments and serum high-sensitivity C-reactive protein (hs-CRP) as the construct validator.

DESIGN:

Using data derived from (i) three 24 h dietary recalls (24HR) at baseline and at the end of each subsequent quarter (i.e. up to fifteen over a year) and (ii) a 7 d dietary recall (7DDR) measured at baseline and then quarterly, regression analyses were conducted to test the effect of the DII score on serum hs-CRP as dichotomous (≤3 mg/l, >3 mg/l), while controlling for important potential confounders.

SETTING:

Existing data from the Seasonal Variation of Blood Cholesterol Study (SEASONS), a longitudinal observational study of healthy participants recruited in Worcester, MA, USA and participants were followed for 1 year.

SUBJECTS:

Participants who had at least one hs-CRP measurement over her/his 1-year participation (n 495 for 24HR, n 559 for 7DDR).

RESULTS:

Higher DII scores were associated with values of hs-CRP >3 mg/l (OR = 1·08; 95 % CI 1·01, 1·16, P = 0·035 for the 24HR; and OR = 1·10; 95 % CI 1·02, 1·19, P = 0·015 for the 7DDR).

CONCLUSIONS:

The population-based DII was associated with interval changes in hs-CRP using both the 24HR and 7DDR. The success of this first-of-a-kind attempt at relating individuals' intakes of inflammation-modulating foods using this refined DII, and the finding that there is virtually no drop-off in predictive capability using a structured questionnaire in comparison to the 24HR standard, sets the stage for use of the DII in a wide variety of other epidemiological and clinical studies.

PMID:
24107546
PMCID:
PMC3983179
DOI:
10.1017/S1368980013002565
[Indexed for MEDLINE]
Free PMC Article

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