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Prospective study of the dietary inflammatory index and risk of breast cancer in postmenopausal women
Author(s) -
Shivappa Nitin,
Blair Cindy K.,
Prizment Anna E.,
Jacobs David R.,
Hébert James R.
Publication year - 2017
Publication title -
molecular nutrition and food research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.495
H-Index - 131
eISSN - 1613-4133
pISSN - 1613-4125
DOI - 10.1002/mnfr.201600592
Subject(s) - medicine , breast cancer , hazard ratio , prospective cohort study , proportional hazards model , cancer , confidence interval , oncology , incidence (geometry) , gynecology , physics , optics
Scope Diet in relation to breast cancer etiology has been studied widely, but results have remained inconsistent. Various dietary components including fruits, vegetables, and meat have been implicated through their effects on inflammation. Using data from the Iowa Women's Health Study we examine prospectively the association between the dietary inflammatory index (DII) and breast cancer incidence. Methods and results DII scores were computed based on baseline dietary intake assessed by a validated 121‐item food frequency questionnaire in a cohort of 34 700 women, aged 55–69 years at recruitment in 1986 and followed for incident breast cancer. During the 25‐year follow‐up period (1986–2011), 2910 incident breast cancer cases were identified. We used Cox proportional hazards regression to estimate multivariable hazard ratios (HRs) and 95% confidence intervals (CI). We found positive associations between DII scores and breast cancer risk (HR for DII tertiles : T 3 vs T 1 = 1.11; 95% CI: 1.00, 1.22), with stronger associations in obese women (HR for DII continuous : 1.05 per unit increase in DII; 95% CI: 1.02, 1.12; HR for DII tertiles : T 3 vs T 1 = 1.35; 95% CI: 1.10, 1.66, p ‐value for interaction = 0.02). Conclusion A proinflammatory diet, as indicated by higher DII scores, appears to increase the risk of developing breast cancer, especially in obese postmenopausal women.