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Results for “Tea drinking”

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PubMed2002

Congou tea drinking and oesophageal cancer in South China.

The study from a large hospital-based case-control for 1248 cases with oesophageal cancer and the same number of controls in South China showed that Congou, a grade of Chinese black tea, may protect against cancers of the oesophagus and reduce the risk of a combination of alcohol drinking and smoking (especially smoking), regardless of temperature when drinking.

Age Factors↗
PubMed2006

Tea drinking and the risk of biliary tract cancers and biliary stones: a population-based case-control study in Shanghai, China.

Biliary tract cancers, encompassing tumors of the gallbladder, extrahepatic bile ducts and ampulla of Vater, are rare but highly fatal malignancies. Apart from gallstones, etiologic factors for biliary tract cancer are not clearly defined. Several epidemiologic studies have suggested that consumption of tea, especially green tea, is protective against a variety of cancers, including gastrointestinal malignancies. As part of a large population-based case-control study of biliary tract disease in Shanghai, China, we evaluated the effects of tea consumption on the risk of biliary tract cancers and biliary stones. The study included 627 incident cases with biliary tract cancer, 1,037 cases with biliary stones and 959 randomly selected controls. Study subjects were interviewed to ascertain data on demographic, medical and dietary factors, including tea consumption. Forty-one percent of the controls were ever tea drinkers, defined as those who consumed at least 1 cup of tea per day for at least 6 months. After adjustment for age, education and body mass index, among women, ever tea drinkers had significantly reduced risks of biliary stones (OR = 0.73, 95% CI = 0.54-0.98) and gallbladder cancer (OR = 0.56, 95% CI = 0.38-0.83). The inverse relationship between tea consumption and gallbladder cancer risk was independent of gallstone disease. Among men, tea drinkers were more likely to be cigarette smokers, and the risk estimates were generally below 1.0, but were not statistically significant. Further studies are needed to confirm these results in other populations and clarify the hormonal and other mechanisms that may be involved.

Adult↗
PubMed1992

Micronucleus formation in peripheral-blood lymphocytes from smokers and the influence of alcohol- and tea-drinking habits.

In recent years, studies on the genotoxic effects of smoking and its modifying factors have been widely followed with interest. In this report, frequencies of micronuclei (MNF) in peripheral-blood lymphocytes in 220 healthy smokers have been detected by the micronucleus test by finger-skin puncture, which needs only 1 to 2 drops of peripheral blood. On the basis of analysis of matched-pair data, the modifying effects of alcohol and tea are discussed. Our results show that (I) smoking significantly increases MNF in lymphocytes as compared with healthy non-smokers (p less than 0.01); (2) alcohol significantly increases MNF in smokers (p less than 0.01); (3) tea decreases MNF induced by smoking (p less than 0.01). Therefore, the anti-carcinogenic role of tea merits further study.

Adult↗
PubMed2004

Direct enantioseparation of catechin and epicatechin in tea drinks by 6-O-alpha-D-glucosyl-beta-cyclodextrin-modified micellar electrokinetic chromatography.

Cyclodextrin-modified micellar electrokinetic chromatography was applied to the enantioseparation of catechin and epicatechin using 6-O-alpha-D-glucosyl-beta-cyclodextrin together with sodium dodecyl sulfate and borate-phosphate buffer. Factors affecting chiral resolution and migration time of catechin and epicatechin were studied. The optimum running conditions were found to be 200 mM borate-20 mM phosphate buffer (pH 6.4) containing 25 mM 6-O-alpha-D-glucosyl-beta-cyclodextrin and 240 mM sodium dodecyl sulfate with an effective voltage of +25 kV at 20 degrees C using direct detection at 210 nm. Under these conditions, the resolution (Rs) of racemic catechin and epicatechin were 4.15 and 1.92, respectively. With this system, catechin and epicatechin enantiomers along with other four catechins ((-)-catechin gallate, (-)-epicatechin gallate, (-)-epigallocatechin, (-)-epigallocatechin gallate) and caffeine in tea samples were analyzed successfully. The difference of migration time between catechin and epicatechin is discussed.

Beverages↗
PubMed2006

Drinking tea is associated with lower plasma total homocysteine in older women.

Dietary polyphenols are suggested to elevate plasma total homocysteine concentration (tHcy). Although tea is rich in polyphenols, it has been associated with lower tHcy, which may be due to its folate content. Our aims were to investigate relationships of tea intake and 4-O-methylgallic acid (4OMGA)--a biomarker of exposure to tea-derived polyphenols--with tHcy in older women. In a cross-sectional study of 232 women over 70 years of age, we measured tHcy, tea intake, 24 h urinary excretion of 4OMGA, and red cell folate. Tea intake and 4OMGA excretion were inversely related to tHcy. Tea intake (>2 cups) and 4OMGA excretion above the median were associated with lower tHcy by approximately 1 mmol/L (P <0.01). Red cell folate was not associated with tea intake or 4OMGA excretion. The observed lower tHcy in women with higher tea intake is consistent in direction and magnitude with previous epidemiological studies, but any mechanisms remain unclear.

Aged↗
PubMed1986

Drink tea, America!

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Cariostatic Agents↗
PubMed2003

[A case-control study on drinking green tea and decreasing risk of cancers in the alimentary canal among cigarette smokers and alcohol drinkers].

OBJECTIVE: To explore the role of green tea in decreasing the risks of gastric cancer, liver cancer, esophageal cancer among alcohol drinkers or cigarette smokers. METHODS: A population based case-control study was conducted in Taixing, Jiangsu province. RESULTS: In Taixing city, identified cases of stomach, liver and esophageal cancers were chosen with informed consent. The numbers were 206, 204, 218 respectively. Controls were chosen from normal population having lived in the area for longer than 10 years, also with informed consent. Green tea drinking seemed to have decreased 81%, 78%, 39% risk for the development of gastric cancer, liver cancer and esophageal cancer among alcohol drinkers. It might also have decreased 16%, 43%, 31% on the risks of developing the three kinds of cancers among cigarette smokers. Interaction assessment showed that drinking green tea could significantly decrease the risk of gastric cancer and liver cancer among alcohol drinkers, with ORs of interaction item 0.23 (95% CI: 0.10 - 0.55) and 0.25 (95% CI: 0.11 - 0.57) respectively. CONCLUSION: Habit of drinking green tea seemed to have significant protective effects on the development of both gastric and liver cancer among alcohol drinkers while, green tea also having some protective effect on esophageal cancer among alcohol drinkers and on three kinds of cancers among cigarette smokers.

Adult↗
PubMed1998

[Effect of tea on fluoride in plaque and saliva].

OBJECTIVE: To evaluate whether tea drinking in a Chinese way in the Chinese population would affect fluoride in plaque and saliva. METHODS: Two groups of students were involved. Group 1, 41 subjects, did not drink tea regularly. Group 2, 34 subjects, drank tea every day in a very regular way. During a study period of three weeks, Group 2 was requested to drink selected (known fluoride concentration) types of tea, and subdivided by the type of tea they drank into two subgroups, Groups 2a and 2b. Group 2a drank lower fluoride tea, while Group 2b drank higher fluoride tea. Plaque and saliva samples were collected at the 2nd and the 3rd end of week, respectively. Fluoride levels were determined with fluoride selective electrode. RESULTS: Both plaque and saliva fluoride were higher in the tea drinking group compared with non-tea drinking group. Plaque fluoride in tea drinking group at the end of three week was significantly higher than the value of non-tea drinking group (t test, P = 0.02). In tea drinking group, three week plaque fluoride was higher than two week plaque. Plaque fluoride level was also significantly corresponded to fluoride in tea. Drinking higher fluoride tea resulted in higher fluoride in plaque. But saliva fluoride was not shown the correlation with tea. CONCLUSION: Tea is an important fluoride source. Plaque is a main resorvior of fluoride. Saliva has not the ability to store fluoride up. When considering tea as a fluoride source, the type of tea which may contain different concentration of fluoride should be borne in mind.

Dental Plaque↗
PubMed2003

Genetic and environmental risk factors and their interactions for Parkinson's disease in a Chinese population.

The interaction between genetic and environmental factors for PD was examined in a Chinese population. It was found that although the intron 2 MAOB (GT)(n) repeat polymorphism was not associated with PD in the population, a relationship might have been masked by the "protective effect" of tea drinking. In individuals who did not drink tea (<1 cup/day), the possession of short length < or = 178 bp (GT)(n) alleles conferred a borderline significant increased risk for PD (adjusted OR=1.47; C.I.=1.03-2.1). As the extent of tea consumption increased, the association between the < or = 178 bp allele and PD disappeared. This result suggests that the MAOB gene may be associated with PD in Chinese if the putative protective effect of tea drinking is taken into account. The significance of this finding is unclear as the study may be limited because of its marginal significance and limited numbers. However, it does demonstrate the importance of considering putative positive and negative environmental risk factors in any examination of genetic risk factors for PD.

Asian People↗