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Vegetable and fruit consumption and risks of colon and rectal cancer in a prospective cohort study

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Author: Voorrips, L.E. · Goldbohm, R.A. · Poppel, G. van · Sturmans, F. · Hermus, R.J.J. · Brandt, P.A. van den
Type:article
Date:2000
Institution: Centraal Instituut voor Voedingsonderzoek TNO
Source:American Journal of Epidemiology, 11, 152, 1081-1092
Identifier: 56900
doi: doi:10.1093/aje/152.11.1081
Keywords: Nutrition · Dietary fiber · Fruit · Rectal neoplasms · Vegetables · Adult · Aged · Brassica · Cancer risk · Cohort analysis · Colon cancer · Eating habit · Female · Food intake · Fruit · Human · Major clinical study · Male · Prospective study · Rectum cancer · Risk factor · Vegetable · Age Distribution · Aged · Case-Control Studies · Colonic Neoplasms · Female · Food Habits · Fruit · Humans · Incidence · Likelihood Functions · Male · Middle Aged · Multivariate Analysis · Netherlands · Prospective Studies · Rectal Neoplasms · Sex Distribution · Vegetables

Abstract

The relation between vegetable and fruit consumption and colorectal cancer risk was comprehensively assessed in the Netherlands Cohort Study on Diet and Cancer using a validated 150-item food frequency questionnaire. After 6.3 years of follow-up (1986-1992), over 1,000 incident cases of colorectal cancer were registered. Using case-cohort analysis, the authors calculated rate ratios and 95% confidence intervals adjusted for age, alcohol intake, and family history of colorectal cancer. For colon cancer, no statistically significant associations with total vegetable intake or total fruit intake were found. However, among women, an inverse association was observed with vegetables and fruits combined (for the highest quintile vs. the lowest, the rate ratio was 0.66 (95% confidence interval: 0.44, 1.01)). Brassica vegetables and cooked leafy vegetables showed inverse associations for both men and women. Among women and, to a lesser extent, among men, inverse associations were stronger for distal colonic tumors than for proximal colonic tumors. For rectal cancer, no statistically significant associations were found for vegetable consumption or fruit consumption or for specific groups of vegetables and fruits; only Brassica vegetables showed a positive association in women. As in other cohort studies, the observed inverse relation between vegetable and fruit consumption and occurrence of colorectal cancer was less strong than relations reported in case-control studies.