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Br J Nutr. 2015 Jun 14;113(11):1819-27. doi: 10.1017/S000711451500104X. Epub 2015 Apr 14.

The dietary inflammatory index is associated with colorectal cancer in the National Institutes of Health-American Association of Retired Persons Diet and Health Study.

Author information

1
The South Carolina Statewide Cancer Prevention and Control Program, University of South Carolina,915 Greene Street, Suite 200,Columbia,SC29223,USA.

Abstract

Diet is a strong moderator of systemic inflammation, an established risk factor for colorectal cancer (CRC). The dietary inflammatory index (DII) measures the inflammatory potential of individuals' diets. The association between the DII and incident CRC was examined, using the National Institutes of Health-American Associations of Retired Persons Diet and Health Study individuals (n 489,422) aged 50-74 years at recruitment, starting between 1995-6, and followed for a mean of 9·1 (sd 2·9) years. Baseline data from a FFQ were used to calculate the DII; higher scores are more pro-inflammatory, and lower scores are more anti-inflammatory. First, primary CRC diagnoses were identified through linkage to state cancer registries. Anatomic location and disease severity also were examined. Cox proportional hazards models estimated CRC hazard ratios (HR) and 95% CI using quartile 1 as the referent. DII quartile 4 compared to quartile 1 was associated with CRC risk among all subjects (HR 1·40, 95% CI 1·28, 1·53; P for trend < 0·01). Statistically significant associations also were observed for each anatomic site examined, for moderate and poorly differentiated tumours, and at each cancer stage among all subjects. Effects were similar when stratified by sex; however, results were statistically significant only in males. The only result reaching statistical significance in females was risk of moderately differentiated CRC tumours (DII quartile 4 v. quartile 1 HR 1·26, 95% CI 1·03, 1·56). Overall, the DII was associated with CRC risk among all subjects. The DII may serve as a novel way to evaluate dietary risk for chronic disorders associated with inflammation, such as CRC.

KEYWORDS:

American Association of Retired Persons; Colorectal cancer; Dietary inflammatory index; Inflammation

PMID:
25871645
PMCID:
PMC4466003
DOI:
10.1017/S000711451500104X
[Indexed for MEDLINE]
Free PMC Article

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