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American Journal of Epidemiology Advance Access originally published online on July 30, 2009
American Journal of Epidemiology 2009 170(5):576-584; doi:10.1093/aje/kwp169
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American Journal of Epidemiology Published by the Johns Hopkins Bloomberg School of Public Health 2009.

ORIGINAL CONTRIBUTIONS

The Effect of Strict Adherence to a High-Fiber, High-Fruit and -Vegetable, and Low-Fat Eating Pattern on Adenoma Recurrence

Leah B. Sansbury, Kay Wanke, Paul S. Albert, Lisa Kahle, Arthur Schatzkin, Elaine Lanza and the Polyp Prevention Trial Study Group

Correspondence to Dr. Leah B. Sansbury, Division of Cancer Control and Population Sciences, 6130 Executive Boulevard, Room 5106, Mail Stop Code 7324, Bethesda, MD 20892 (e-mail: sansburl{at}mail.nih.gov).

Received for publication October 31, 2008. Accepted for publication May 22, 2009.

Individual differences in dietary intake are thought to account for substantial variation in cancer incidence. However, there has been a consistent lack of effect for low-fat, high-fiber dietary interventions and risk of colorectal cancer. These inconsistencies may reflect the multistage process of cancer as well as the range and timing of dietary change. Another potential reason for the lack of effect is poor dietary adherence among participants in these trials. The authors examined the effect of strict adherence to a low-fat, high-fiber, high-fruit and -vegetable intervention over 4 years among participants (n = 1,905) in the US Polyp Prevention Trial (1991–1998) on colorectal adenoma recurrence. There was a wide range of individual variation in the level of compliance among intervention participants. The most adherent participants, defined as "super compliers" (n = 210), consistently reported that they met or exceeded each of the 3 dietary goals at all 4 annual visits. Multivariate logistic regression models were used to estimate the association between dietary adherence and adenoma recurrence. The authors observed a 35% reduced odds of adenoma recurrence among super compliers compared with controls (odds ratio = 0.65, 95% confidence interval: 0.47, 0.92). Findings suggest that high compliance with a low-fat, high-fiber diet is associated with reduced risk of adenoma recurrence.

adenoma; colorectal neoplasms; dietary fiber; patient compliance; polyps


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