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Longitudinal changes in the dietary inflammatory index: an assessment of the inflammatory potential of diet over time in postmenopausal women
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Longitudinal changes in the dietary inflammatory index: an assessment of the inflammatory potential of diet over time in postmenopausal women
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Journal Article
Longitudinal changes in the dietary inflammatory index: an assessment of the inflammatory potential of diet over time in postmenopausal women
2016
Overview
Background/Objectives:
The dietary inflammatory index (DII) measured at one time point is associated with risk of several chronic diseases, but disease risk may change with longitudinal changes in DII scores. Data are lacking regarding changes in DII scores over time; therefore, we assessed changes in the DII in the Women’s Health Initiative (WHI).
Subjects/Methods:
DII scores were calculated using data from repeated food frequency questionnaires in the WHI Observational Study (OS;
n
=76 671) at baseline and year 3, and the WHI Dietary Modification trial (DM;
n
=48482) at three time points. Lower DII scores represent more anti-inflammatory diets. We used generalized estimating equations to compare mean changes in DII over time, adjusting for multiple comparisons, and multivariable-adjusted linear regression analyses to determine predictors of DII change.
Results:
In the OS, mean DII decreased modestly from −1.14 at baseline to −1.50 at year 3. In the DM, DII was −1.32 in year 1, −1.60 in year 3 and −1.48 in year 6 in the intervention arm and was −0.65 in year 1, −0.94 in year 3 and −0.96 in year 6 in the control arm. These changes were modified by body mass index, education and race/ethnicity. A prediction model explained 22% of the variance in the change in DII scores in the OS.
Conclusions:
In this prospective investigation of postmenopausal women, reported dietary inflammatory potential decreased modestly over time. Largest reductions were observed in normal-weight, highly educated women. Future research is warranted to examine whether reductions in DII are associated with decreased chronic disease risk.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 692/499
/ Diet
/ Diet - statistics & numerical data
/ Female
/ Humans
/ Inflammation - complications
/ Medicine
/ Risk
/ Women
