Proceedings of the Nutrition Society

Research Article

Cruciferous vegetable intake and the risk of human cancer: epidemiological evidence

Conference on ‘Multidisciplinary approaches to nutritional problems’ Symposium on ‘Nutrition and health’

on 30 June–3 July 2008, The Summer Meeting of the Nutrition Society, was held at the University of Nottingham.

Mi Kyung Kima1 and Jung Han Yoon Parka2 c1

a1 Carcinogenesis Branch, National Cancer Center, Kyunggido, Korea

a2 Department of Food Science and Nutrition, Hallym University, Chuncheon, Korea

Abstract

Over several decades a number of epidemiological studies have identified the inverse associations between cruciferous vegetables and the risk of several cancers, including gastric, breast, colo-rectal, lung, prostate, bladder and endometrial cancers, via plausible physiological mechanisms. Although retrospective case–control studies have consistently reported inverse associations between the risk of these cancers and the intake of cruciferous vegetables and isothiocyanate-containing plants, current prospective cohort studies have found these associations to be weaker and less consistent. Genetic variations affecting the metabolism of glucosinolate hydrolysis products may modulate the effects of cruciferous vegetable consumption on cancer risk, which may be one of the reasons for the discrepancies between retrospective and prospective studies. In addition, methodological issues such as measurement errors of dietary exposure, misclassification, recall bias, publication bias, confounding and study design should be carefully considered in interpreting the results of case–control and cohort studies and in drawing conclusions in relation to the potential effects of cruciferous vegetables on cancers. Although recent comprehensive reviews of numerous studies have purported to show the specific protective role of cruciferous vegetables, and particularly Brassicas, against cancer risk, the current epidemiological evidence suggests that cruciferous vegetable consumption may reduce the risk only of gastric and lung cancers. However, there is at present no conclusive evidence that the consumption of cruciferous vegetables attenuates the risk of all other cancers.

(Online publication December 08 2008)

Correspondence:

c1 Corresponding author: Professor Jung Han Yoon Park, fax +82 33 256 0199, email jyoon@hallym.ac.kr