Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Tea drinking”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 199 records · Page 11Linked to original sources
PubMed2001

Joint effects of citrus peel use and black tea intake on the risk of squamous cell carcinoma of the skin.

BACKGROUND: Differences in tea drinking habits and/or citrus peel use are likely to vary by populations and could contribute to the inconsistencies found between studies comparing their consumption and cancer risk. METHODS: A population-based case-control study was used to evaluate the relationships between citrus peel use and black tea intake and squamous cell carcinoma (SCC) of the skin. Moreover, we assessed the independent and interactive effects of citrus peel and black tea in the development of SCC. RESULTS: Hot and iced teas were consumed by 30.7% and 51.8% of the subjects, respectively. Peel consumption was reported by 34.5% of subjects. Controls were more likely than were cases to report citrus peel use (odds ratio (OR) = 0.67) and hot tea intake (OR = 0.79). After adjustment for hot and iced tea intake, the ORs associated with citrus peel use were 0.55 and 0.69, respectively, whereas the corresponding adjusted ORs for hot and iced tea intake after adjustment for citrus peel use were 0.87 and 1.22 respectively. Compared with those who did not consume hot black tea or citrus peel, the adjusted ORs associated with sole consumption of hot black tea or citrus peel were 0.60 and 0.30, respectively. Subjects who reported consumption of both hot black tea and citrus peel had a significant marked decrease (OR= 0.22; 95% CI = 0.10 - 0.51) risk of skin SCC. CONCLUSION: These results indicate that both citrus peel use and strong (hot) black tea have independent potential protective effects in relation to skin SCC.

Age Distribution↗
PubMed2001

Candidate foods in the Asia-Pacific region for cardiovascular protection: Oriental tea.

Chinese tea and the major health effects include: antimicrobial, anti-ultraviolet radiation, anticancer, lowering blood lipid and glucose, and protecting against coronary heart diseases. In contrast to the extensive studies on the protective effects of tea on cancer, fewer studies on the health effects of tea on cardiovascular diseases (CVD) have been published. This paper summarises the research results on the possible protective effects of tea on CVD available in China. The results from animal studies clearly demonstrated that tea pigments are effective in lowering blood lipid levels and preventing plaque formation in the aorta. However, the evidence of tea pigments in protecting ischemia heart disease (IHD) in humans is less convincing. One large well-designed ecological study reported an inverse correlation between tea drinking and IHD mortality; but the inverse correlation disappeared after controlling possible confounding factors. However, the effects in improving blood lipid levels and rheology biomarkers in hyperlipidemia subjects or CVD patients by tea pigments seem promising. However, these studies were not well-designed, controlled randomized clinical trials. This made the assessment difficult and inconclusive.

Animals↗
PubMedDate not supplied

Parkinson's disease and environmental factors. Matched case-control study in the Limousin region, France.

The study included 140 patients with Parkinson's disease (PD) and 280 non-Parkinson age-matched controls to evaluate environmental risk factors associated with PD. The effect of exposure to environmental and dietary factors was determined using conditional logistic regression. This multivariate analysis showed that PD in first-degree relatives and tea drinking were the main risk factors for PD. Smoking appeared to be a protective factor. Exposure to toxic compounds was not a significant risk factor. Further research is needed to validate that tea consumption increases the risk of PD.

Aged↗
PubMedDate not supplied

Spectrophotometric determination of ascorbic acid in canned fruit juices, cordials, and soft drinks with iron(III) and 1,10-phenanthroline as reagents.

A simple and accurate spectrophotometric method has been developed for the determination of ascorbic acid in canned fruit juices, cordials, and soft drinks, based on the reduction of iron(III) by ascorbic acid to iron(II), which is then complexed with 1,10-phenanthroline. Background correction is necessary for most samples and can be achieved by copper(II)-catalyzed oxidation of the acid. The calibration graph was linear from 0 to 8 micrograms/mL of ascorbic acid with a slope of 0.12/ppm. The precision for the determination of ascorbic acid in a lemon drink containing 210 micrograms/mL of the acid was 0.9%. Many ingredients commonly found in fruit juices, cordials, and soft drinks do not interfere; however, tannic acid, pyrogallol, and sulfite interfere with the method. A wide range of samples was analyzed for ascorbic acid content by the proposed method. The samples included mango and lemon tea drinks and also grapefruit juices, for which no background correction is needed.

Alcoholic Beverages↗
PubMed1999

Ion exchange chromatography of aluminum using 3-carboxy-2-naphthylamine-N,N-diacetic acid as a fluorescent post-column chelating reagent.

Ion exchange chromatography of aluminum ion using 3-carboxy-2-naphthylamine-N,N-diacetic acid (CNDA) as a fluorescent post-column chelating reagent was studied. The solution containing ammonium chloride and hydrochloric acid was used for the eluent, and acetate buffer solution containing CNDA was used for the post column chelating reagent. The peak of aluminum was separated from that of calcium, magnesium and zinc, and the chromatogram was not affected by copper(II) and iron(III). The calibration curve gave linear plots with a range of 0.0027-0.54 ppm aluminum, the regression coefficient of correlation (r2) was 1.000, and the detection limit (S/N = 3) was 0.3 ppb, indicating that the method could determine aluminum with high sensitivity. It was demonstrated that CNDA is a useful metallofluorescent reagent for aluminum. This method has been successfully applied to the determination of aluminum in some tea drinks.

Aluminum↗
PubMed2000

Hippuric acid as a major excretion product associated with black tea consumption.

1. Nine habitual tea-drinking volunteers were recruited and asked to follow a low-polyphenol and low-caffeine diet for 6 days and to provide daily 24-h urine samples. On day 4 of the experiment strong black tea brewed under standardized conditions was re-introduced to the volunteers' diet. 2. 1H-NMR and HPLC profiling of the urine samples indicated that consumption of black tea (6-10 mugs per day) was associated with a significant (p = 0.00017) increase in hippuric acid excretion relative to control, increasing from 153-512 to 742-1374 mg day(-1). The excretion of substantial amounts of hippuric acid has not previously been associated with black tea consumption. 3. For some volunteers, the quantity of benzoic acid processed exceeded the acceptable daily intake (ADI), but this is not considered to constitute any hazard. 4. A mass-balance analysis indicated that the necessary quantity of benzoic acid could not be obtained from the contents of gallic acid, flavanols, flavonol glycosides and theaflavins in black tea even if 100% transformation was obtained, suggesting that the thearubigins (the major and chemically ill-defined polyphenols of black tea) may be an important source.

Adult↗
PubMed1984

Factors distinguishing couples at risk for nondisjunction.

Micronucleus frequencies were determined on 24 young parents of trisomic infants, 21 individuals with recurrent unexplained abortions, and 42 control individuals with proven reproductive success. In addition to measurements of spontaneous micronucleus frequencies, mitomycin C induced frequencies were determined at two doses (2.5 and 5.0 ng/mL). Using the 95% confidence limits established from control data as an arbitrary upper limit, 16 of 24 parents of trisomics and 5 of 21 recurrent aborters were detected by the micronucleus assay to above this cutoff. The effects of sex, age, pregnancy status, and a variety of environmental exposures were studied by comparing the micronucleus frequencies of the exposed and unexposed populations. The data suggested that vitamins were associated with a lower micronucleus frequency and tea drinking with an increased micronucleus frequency in parents of trisomics, an effect not seen in controls. These results suggest that a biologic basis for nondisjunction may be associated with elevation in spontaneous and induced micronuclei. In addition, tea and vitamins may modulate micronucleus frequencies in parents of trisomics who appear to be more sensitive to these influences than the controls.

Abortion, Habitual↗
PubMed2006

Diet synergies and mortality--a population-based case-control study of 32,462 Hong Kong Chinese older adults.

BACKGROUND: Food and drink are not consumed in isolation and can have complimentary effects enhancing or blocking the overall uptake of nutrients. We investigated how combinations of foods, drinks, and smoking affected mortality. Method Adjusted logistic regression was used to assess the joint effect of healthy foods, less healthy foods, smoking, and alcohol use on mortality in a case-control study of all Chinese adults aged 60 or over who died in 1998; 21,494 dead cases (81% of all registered deaths) and 10,968 live controls were included. RESULTS: There was a significant trend of increasing all-cause mortality risk with decreasing healthy food consumption (P < 0.001), and the increase in risk was significantly steeper for people with high intakes of less healthy food (P for interaction <0.001). There was a steeper risk from increasing less healthy food intake in ever-smokers and people not drinking tea regularly (P < 0.001), while the J-shaped relationship between alcohol and mortality differed in shape with level of less healthy food intake. CONCLUSION: Intake of some dietary items may modify the effect of others. An analysis framework explicitly recognizing complementary and potentially synergistic effects of food, drinks, and smoking could enhance our understanding of dietary epidemiology.

Aged↗
PubMed1996

[Difficulties encountered in gathering information on illegal abortion in the population of women].

Any attempt to study the practice of illegal abortion faces the problem of asking women about a delicate, sensitive issue that has many implications. This may make it difficult to obtain truthful information on the subject. Results related to methodological aspects are emphasized and their possible association with variables included in a cross-sectional study carried out among 1,955 women, of 15 to 49 years of age is analysed. The frequency and conditions under which induced abortion was performed in a region of S. Paulo State are investigated. The women were interviewed at home using a pre-tested, structured questionnaire. Most of the women interviewed declared they had never had an abortion nor had they thought of having one, and four percent referred to having had an induced abortion. However, another 16.7 percent said that they had taken tea or medicine at least once to bring on their menses. In this group, most of the women who thought they were pregnant at that time said they had had never an abortion, in spite of having bled after drinking tea or medicine. The results lead to the conclusion that women tend no omit information on the practice of abortion when questioned directly. This is especially true of those who use oral means to bring on their menses and who seemed not to consider this a way of inducing an abortion.

Abortion, Illegal↗
PubMed2001

A population-based case-control study of lung cancer and green tea consumption among women living in Shanghai, China.

Epidemiologic evidence regarding the association between the consumption of green tea and lung cancer is limited and inconclusive, although experimental studies have shown consistently that tea preparations and tea polyphenols may inhibit the induction of a variety of cancers, including lung cancer. In this population-based case-control study, we examined the association between past consumption of green tea and the risk of lung cancer. We identified 649 incident cases of primary lung cancer among women diagnosed from February 1992 through January 1994 using the population-based Shanghai Cancer Registry. We randomly selected a control group of 675 women from the Shanghai Residential Registry, frequency-matched to the expected age distribution of the cases. Green tea consumption was ascertained through face-to-face interviews. We estimated adjusted odds ratios (ORs) and 95% confidence intervals (95% CIs) using unconditional logistic regression. Among nonsmoking women, consumption of green tea was associated with a reduced risk of lung cancer (OR = 0.65; 95% CI = 0.45-0.93), and the risks decreased with increasing consumption. We found little association, however, among women who smoked (OR = 0.94; 95% CI = 0.40-2.22). The inconsistency in the association between drinking tea and the risk of lung cancer reported in previous studies may in part be due to inadequate control of confounding of active smoking.

Adult↗
PubMed1995

Anticholinergic poisoning associated with an herbal tea--New York City, 1994.

Inadvertent anticholinergic poisoning can result from consumption of foods contaminated with plants that contain belladonna alkaloids. During March 1994, the New York City Department of Health (NYCDOH) investigated seven cases of anticholinergic poisoning in members of three families; three of the seven ill persons required emergency treatment for characteristic manifestations. For all cases, manifestations occurred within 2 hours after drinking tea made from leaves purchased commercially and labeled as Paraguay tea--an herbal tea derived from the plant llex paraguariensis, which is native to South America. This report summarizes the investigation of these cases.

Adult↗
PubMed2004

Coffee consumption and glucose tolerance status in middle-aged Japanese men.

AIMS/HYPOTHESIS: Several studies have reported that coffee has a protective effect against the development of type 2 diabetes. However, few of these studies used the standard glucose tolerance test to diagnose type 2 diabetes. The aim of this study was to investigate the relationship between coffee and green tea consumption and glucose tolerance status as determined using a 75-g OGTT. METHODS: We performed a cross-sectional study of 3224 male officials of the self-defence forces. Glucose tolerance status was determined in accordance with the 1998 World Health Organization criteria, and average intakes of coffee and green tea over the previous year were assessed by a self-administered questionnaire. The figures obtained were adjusted for BMI, physical activity and other factors. RESULTS: A total of 1130 men were identified as having glucose intolerance (IFG, IGT or type 2 diabetes). Compared with those who did not consume coffee on a daily basis, fasting and 2-h post-load plasma glucose levels were 1.5% and 4.3% lower in those who drank 5 cups of coffee or more per day respectively. The adjusted odds ratios of glucose intolerance for categories of <1, 1-2, 3-4 and >/=5 cups of coffee per day were 1.0 (referent), 0.8 (95% CI 0.6-1.0), 0.7 (95% CI 0.6-0.9) and 0.7 (95% CI 0.5-0.9) respectively (p=0.0001 for trend). No clear association was observed between green tea drinking and glucose tolerance status. CONCLUSIONS/INTERPRETATION: Coffee consumption may inhibit postprandial hyperglycaemia and thereby protect against the development of type 2 diabetes mellitus.

Alcohol Drinking↗
PubMedDate not supplied

Serum gamma-glutamyl transpeptidase and alkaline phosphatase of people in Khon Kaen, the northeastern Thailand.

Serum gamma-glytamyl transpeptidase (GGT) and alkaline phosphatase (ALP) of the normal population in Northeastern Thailand were measured. The median serum GGP and ALP levels of females was significantly lower than the values for males, i.e., 21 (range=9-260) versus 32 (range=9-459) and 73 (range= 20-428) versus 83 (range=13-171) U/L, respectively. Serum ALP level tended to increase with age in both male and female populations, whereas serum GGT level did not show any age dependence. Serum GGT and ALP levels of cigarette smokers were significantly higher than those of the non-smokers. Alcohol, coffee or tea drinking also resulted in higher serum GGT value whereas serum ALP values were not changed. Beta l nut chewing caused only lower serum GGT but not serum ALP values. The total population in Ban Fang district seemed to have lower serum GGT than those in Chonnabot district. The results from our study give the base line data of serum GGT and ALP in a Thai population. We also confirm the association of serum GGT with cigarette smoking, alcohol and coffee/tea drinking which are risk factors of cancer.

Adult↗
PubMed2000

Gallic acid metabolites are markers of black tea intake in humans.

Gallic acid is one of the main phenolic components of black tea. The objective of this study was to identify urinary gallic acid metabolites with potential for use as markers of black tea intake. In an initial study, nine compounds, assessed by using gas chromatography-mass spectrometry, were found to increase in concentration in urine after 3 cups of black tea over 3 h. A subsequent study employed a controlled crossover design in which 10 subjects consumed 5 cups per day of black tea or water for 4 weeks in random order. Twenty-four hour urine samples were collected at the end of each period. Of the 9 candidate compounds identified in the initial study, only 3 were present at higher concentrations in urine of all 10 subjects during tea-drinking in comparison to water-drinking periods. These compounds were identified as 4-O-methylgallic acid, 3-O-methylgallic acid, and 3, 4-O-dimethylgallic acid, all methyl ether derivatives of gallic acid. It is suggested that these compounds have the potential to be used as markers of black tea intake.

Biotransformation↗
PubMed2005

Effect of tea catechins on postprandial plasma lipid responses in human subjects.

Epidemiological surveys suggest that a higher intake of tea may be associated with a lower risk of CHD. There is accumulating evidence that postprandial lipaemia makes a substantial contribution to the incidence of CHD. Our aim was, therefore, to evaluate the effect of tea catechins (major ingredients in green tea) on postprandial lipid responses in human subjects after the consumption of test meals. In a randomized triple-crossover design, nine male subjects with mild or borderline hypertriacylglycerolaemia consumed 10 (control), 224 (moderate dose) and 674 mg (high dose) of the assigned tea catechins three times each along with a standardized light meal consisting of a piece of bread spread with 20 g butter. Plasma lipids were measured in the fasting state and 1, 2, 3, 4 and 6 h after consuming the light meal. Results showed that, compared with the control, moderate and high doses of tea catechins reduced the incremental area under the plasma triacylglycerol curves by 15.1 and 28.7%, respectively. Next, the rapid elevation of remnant-like particle cholesterol was significantly inhibited by a high dose of tea catechins 2 h after consuming the light meal (P<0.01). In the range of tea catechin dosages, no significant differences were observed in the postprandial responses for plasma total cholesterol or NEFA at any time point. In conclusion, this trial demonstrated that tea catechins attenuated the postprandial increase in plasma triacylglycerol levels following a fat load. These results may provide evidence for one of the possible mechanisms involved in lowering the incidence of CVD, and may prove useful in further studies on the beneficial health effects of tea drinking.

Adult↗
PubMed1994

Maté, coffee, and tea consumption and risk of cancers of the upper aerodigestive tract in southern Brazil.

Consumption of maté, a tea-like infusion of the herb Ilex paraguariensis, is common in South America. Drinkers have high risks of upper aerodigestive tract cancers, but it is conceivable that this high risk may be attributable to confounding by smoking alcohol, and other exposures. To test this hypothesis, we analyzed the data from a case-control study of upper aerodigestive tract cancers conducted in Southern Brazil. We matched noncancer controls (N = 756) to cases (N = 378) on the basis of age, sex, and period of admission. We estimated the effect of mateé consumption by conditional logistic regression with adjustment for smoking, alcohol, sociodemographics, and several dietary items, considered as confounders. The unadjusted relative risk (RR) for all upper aerodigestive tract cancers was 2.1 [95% confidence interval (CI) = 1.6-2.7]. Some excess risk persisted after adjustment for potential confounders (RR = 1.6; 95% CI = 1.2-2.2). Most of the excess risk for maté drinkers was for oral (RR = 1.9; 95% CI = 1.1-3.3) and laryngeal (RR = 2.2; 95% CI = 2.2; 95% CI = 1.1-4.5) cancers. There was no evidence of associations with coffee and tea drinking. We conclude that the association of maté consumption with upper aerodigestive tract cancer risk is unlikely to result from insufficient control of confounding by critical exposures. Owing to its high prevalence in Southern South America, maté drinking may be linked to as many as 20% of all cases occurring in this region.

Aged↗
PubMed1987

Coffee consumption and risk of pancreatic cancer.

The relationship between pancreatic cancer and coffee, decaffeinated coffee and tea drinking habits was evaluated using data from a hospital-based case-control study conducted in Northern Italy on 150 histologically confirmed cases and 605 controls with acute, non-neoplastic, other than digestive tract diseases unrelated to coffee consumption or to any of the known or potential risk factors for cancer of the pancreas. Compared with subjects who did not drink coffee, the multivariate relative risks were 1.7 for those who drank less than 2 cups per day, but only 1.4, and 1.1 respectively for drinkers of 3 or 4 and 5 or more cups. Likewise, there was no association with duration of consumption of coffee, decaffeinated coffee or tea. These findings were reviewed together with published evidence from other case-control studies (or cohort studies analyzed as case-control) of coffee and pancreatic cancer. When appropriate statistical methods were used to pool information, and the data from the first study which was the basis of the hypothesis were omitted, the relative risk of pancreatic cancer based on 1,464 cases was 1.2 for moderate coffee drinkers and 1.4 for heavy drinkers, and we suspect that at least part of this moderate residual association is confounded by cigarette smoking. Thus, although the present investigation and a general overview of published epidemiological evidence are compatible with a small effect of coffee on pancreatic carcinogenesis, interpretation of these findings is not obvious on account of the possibility of residual confounding and other sources of bias.

Adult↗
PubMed2002

Inverse association of tea and flavonoid intakes with incident myocardial infarction: the Rotterdam Study.

BACKGROUND: Dietary flavonoids may protect against cardiovascular disease, but evidence is still conflicting. Tea is the major source of flavonoids in Western populations. OBJECTIVE: The association of tea and flavonoid intake with incident myocardial infarction was examined in the general Dutch population. DESIGN: A longitudinal analysis was performed with the use of data from the Rotterdam Study-a population-based study of men and women aged >or=55 y. Diet was assessed at baseline (1990-1993) with a validated semiquantitative food-frequency questionnaire. The analysis included 4807 subjects with no history of myocardial infarction, who were followed until 31 December 1997. Data were analyzed in a Cox regression model, with adjustment for age, sex, body mass index, smoking status, pack-years of cigarette smoking, education level, and daily intakes of alcohol, coffee, polyunsaturated fat, saturated fat, fiber, vitamin E, and total energy. RESULTS: During 5.6 y of follow-up, a total of 146 first myocardial infarctions occurred, 30 of which were fatal. The relative risk (RR) of incident myocardial infarction was lower in tea drinkers with a daily intake >375 mL (RR: 0.57; 95% CI: 0.33, 0.98) than in nontea drinkers. The inverse association with tea drinking was stronger for fatal events (0.30; 0.09, 0.94) than for nonfatal events (0.68; 0.37, 1.26). The intake of dietary flavonoids (quercetin + kaempferol + myricetin) was significantly inversely associated only with fatal myocardial infarction (0.35; 0.13, 0.98) in upper compared with lower tertiles of intake. CONCLUSIONS: An increased intake of tea and flavonoids may contribute to the primary prevention of ischemic heart disease.

Aged↗