Green Tea and the Risk of Gastric Cancer in Japan

Abstract

In a population-based, prospective cohort study in Japan, we found no association between green-tea consumption and the risk of gastric cancer.

Diet and the risk of gastric cancer: review of epidemiological evidence

“…In contrast to laboratory studies and most casecontrol studies, however, all but one recent cohort study have shown no protective effect of green tea for gastric cancer [62][63][64][65]. In a population-based prospective study conducted in Miyagi Prefecture in northern Japan, the RRs associated with drinking one or two, three or four, and fi ve or more cups of green tea per day, as compared with less than one cup per day, were 1.3 (95% CI = 0.8-1.9), 1.2 (95% CI = 0.8-1.8), and 1.5 (95% CI = 1.0-2.1), respectively, in men (for trend, P = 0.03), and 0.8 (95% CI = 0.5-1.5), 0.7 (95% CI = 0.4-1.3), and 0.8 (95% CI = 0.5-1.3), respectively, in women (for trend, P = 0.46) [62].…”

“…In a population-based prospective study conducted in Miyagi Prefecture in northern Japan, the RRs associated with drinking one or two, three or four, and fi ve or more cups of green tea per day, as compared with less than one cup per day, were 1.3 (95% CI = 0.8-1.9), 1.2 (95% CI = 0.8-1.8), and 1.5 (95% CI = 1.0-2.1), respectively, in men (for trend, P = 0.03), and 0.8 (95% CI = 0.5-1.5), 0.7 (95% CI = 0.4-1.3), and 0.8 (95% CI = 0.5-1.3), respectively, in women (for trend, P = 0.46) [62]. In a nationwide multicenter prospective study, no inverse association was found between green tea consumption and gastric cancer death, with the risks associated with drinking 1 or 2, 3 or 4, 5-9, and ≥ 10 cups of green tea per day, relative to those of drinking less than 1 cup per day, of 1.6 (95% CI = 0.9-2.9), 1.1 (95% CI = 0.6-1.9), 1.0 (95% CI = 0.5-2.0), and 1.0 (95% CI = 0.5-2.0), respectively, in men (for trend, P = 0.669), and 1.1 (95% CI = 0.5-2.5), 1.0 (95% CI = 0.5-2.5), 0.8 (95% CI = 0.4-1.6), and 0.8 (95% CI = 0.3-2.1), respectively, in women (for trend, P = 0.448) [63].…”

Green Tea and the Risk of Colorectal Cancer: Pooled Analysis of Two Prospective Studies in Japan

“…In a validation study of the food frequency questionnaire in which 119 subjects provided four 3-day food records in one year and then responded to the questionnaire, we observed a reasonably high degree of validity and reproducibility for the questionnaire measurement of green tea intake; Spearman's correlation coefficient for green-tea intake measured by the questionnaire and by the food records was 0.66, and the correlation between the two questionnaires administered in 6-month interval was 0.66. 14 The proportion of subjects who were lost to follow-up was 18.5% for Cohort 1. The subjects who were lost to follow-up were more likely to be young, be current smokers, have family history of colorectal cancer, and less likely to be current alcohol drinkers, obese, as compared with those who could be follow-up.…”

Chamomile Consumption and Mortality: A Prospective Study of Mexican Origin Older Adults

“…The current study explores the connection between consumption of chamomile tea and 7-year all-cause mortality in a sample of older Mexican American adults residing in the Southwestern United States. Given the results from other cohort studies on the health protective effects of consumption of black and green tea (KrisEtherton & Keen, 2002;Kuriyama et al, 2006;Peters et al, 2001;Tsubono et al, 2001;Zheng et al, 1996) as well as the broad biological effects of chamomile and potential for cardiovascular and cancer risk reduction, we hypothesized that consumption of chamomile tea would be associated with reduced all-cause mortality and possibly cardiovascular and cancer mortality in Mexican origin older adults. We also hypothesized that, due to gender differences in the rate of chamomile consumption, the effect of chamomile on mortality would be different for men and women.…”

“…Tea consumption, both black and green, has been linked to a lower risk of mortality, reduced cardiovascular events, and reduced incidence of some cancers (Cooper, Morre, & Morre, 2005;Iwai et al, 2002;KrisEtherton & Keen, 2002;Kuriyama et al, 2006;Tsubono et al, 2001;Zaveri, 2006;Zheng et al, 1996). A report on the effects of green tea on all-cause and cause-specific mortality of adults in Japan suggested that consumption of three or more cups of green tea per day was associated with…”