Longitudinal changes in the dietary inflammatory index: an assessment of the inflammatory potential of diet over time in postmenopausal women
Department of Medicine, Division of Preventive and Behavioral Medicine; UMass Worcester Prevention Research Center
Dietetics and Clinical Nutrition | Epidemiology | Human and Clinical Nutrition | Nutritional Epidemiology | Women's Health
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.
DOI of Published Version
Eur J Clin Nutr. 2016 Dec;70(12):1374-1380. Epub 2016 Jul 6. Link to article on publisher's site
European journal of clinical nutrition
Tabung, F. K.; Steck, S. E.; Zhang, J.; Ma, Yunsheng; Liese, A. D.; Tylavsky, F. A.; Vitolins, M. Z.; Ockene, Judith K.; and Hebert, J. R., "Longitudinal changes in the dietary inflammatory index: an assessment of the inflammatory potential of diet over time in postmenopausal women" (2016). Open Access Articles. 3026.