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Tea Health Research

A small study (19 subjects) has reported that black tea lowered blood pressure and increased arterial flexibility compared to placebo. Te authors suggest that regular tea consumption can have cardioprotective effects.

Davide Grassi et al. Black Tea Lowers Blood Pressure and Wave Reflections in Fasted and Postprandial Conditions in Hypertensive Patients: A Randomised Study. Nutrients 2015, 7(2), 1037-1051.

http://www.mdpi.com/2072-6643/7/2/1037

Drinking at least three cups of black tea a day (with or without milk) is associated with significantly reduced reduced risks of developing osteoporotic (34%) and hip (42%) fractures in older women (mean age 75) compared to women who rarely drink tea ...

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A small study of 12 healthy individuals found that those administered a drink containing green tea showed increased activity in the dorsolateral prefrontal cortex (DLPFC) of the brain compared to those who consumed a non-green tea drink, and the larg

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Malignant mesothelioma is an asbestos-related fatal disease with no effective cure. Now a Japanese study has found that epigallocathechin-3-gallate (EGCG) - found in green but not in black tea - caused apoptosis (cell death) in five different human m

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Scottish researchers have developed a new delivery method for epigallocatechin gallate, an active compound from green tea, which is capable of directly targeting skin cancer cells and shrinking tumours.

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Green tea has long been revered for its beneficial effects on memory, and Chinese researchers have now discovered that EGCG, (epigallocatechin-3 gallate) may improve cognitive function in by increasing the generation of new neurones (neurogenesis).

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Daily supplementation with green tea extract (GTE) has been shown to favourably influence blood pressure, insulin resistance, inflammation, oxidative stress and lipid profile in patients with obesity-related hypertension.

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According to a Chinese proverb, 'Drinking a daily cup of tea will surely starve the apothecary.'

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A study presented at this week's American Association for Cancer Research's annual prevention conference found that of 67 men with prostate cancer

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Here's a link to a video summarising the research presented at the Fifth International Scientific Symposium on Tea & Human Health

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Green tea extract has been found to lead to improvements in blood pressure, blood sugar levels, cholesterol and markers of inflammation in obese people with high blood pressure.

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Pu'er Tea extract can help treat the metabolic syndrome that is the precursor to type 2 diabetes, according to the results of a Chinese study.

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A Taiwanese study has found that drinking at least one cup of green tea a day can significantly reduce the risk of developing lung cancer, and - in patients with one specific genotype - may reduce the risk even among those who smoke. (Green tea co

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A study of nearly 14,000 Japanese elders (65+) found that green tea consumption was associated with a reduced risk of functional disability over the three-year study period, even after adjustment for other possibly confounding lifestyle factors.

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UK research suggests that digestion of green tea by gut enzymes produces chemicals that may be more effective against Alzheimer's disease and cancer than those in undigested tea.

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It's not research as such but Cha Dao: A Journal of Tea and Tea Culture is a wonderful tea website with high quality discussion and information on tea.

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An American study has found that theaflavin-2 - a substance found only in black and oolong teas - was able to induce aptosis (cell death) in cancer cells in the laboratory within three hours of treatment. The theaflavin-2 acted by activating a s

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EGCG - a major polyphenol found in green tea - has been found to increase the number of regulatory T cells which play an important role in immune function and suppression of autoimmune disease.

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A study by an American research team has demonstrated that tai chi exercise (TC) and supplementation with green tea polyphenols (GTP) can benefit bone remodeling and muscle strength in postmenopausal women

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Drinking several cups of tea daily can cut your risk of coronary heart disease (CHD) by more than a third, according to Dutch researchers. The investigators followed 40,000 healthy people for 13 years, finding that participants who drank between thre

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New research conducted at Newcastle University suggests that regular consumption of green tea may protect the brain against developing Alzheimer's and other forms of dementia, as well as cancer. The particular aim of this study was to establish if th

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We examined tea extracts, (-) epigallocatechin gallate (EGCg) and theaflavin digallate (TF3) for their antimicrobial and microbicidal activities against Mycoplasma. Green tea and black tea showed antimicrobial activities against M. pneumoniae. At a

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We found that extracts of Japanese green tea leaves inhibited the growth of various bacteria causing diarrheal diseases. All tea samples tested showed antibacterial activity against Staphylococcus aureus, S. epidermidis, Vibrio cholerae O1, V. chol

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The effect of hot water extract of green tea on the collagen-induced aggregation of washed rabbit platelets was examined. The extract lowered submaximal aggregation and prolonged the lag time in a dose-dependent manner. After fractionation of the e

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Long-term administration of (-)-epigallocatechin 3-O-gallate (EGCG) to mice through drinking water prevented radiation-induced increase of lipid peroxides in liver and significantly prolonged life span after lethal whole-body X-irradiation. The res

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Intracortical injections of iron ions have been shown to induce recurrent seizures and epileptic discharges in the EEG. (-)-Epigallocatechin (EGC) and (-)-epigallocatechin-3-O-gallate (EGCG), isolated from green tea leaves, have been reported to prev

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The dental caries inhibiting effect of the extract from Japanese green tea, one of the most popular drinks in Japan, was studied both in vitro and in vivo. The crude tea polyphenolic compounds (designated Sunphenon) from the leaf of Camellia sinens

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Background

Tea from the Camellia sinensis species of the Theaceae family is one of the most ancient and, next to water, the most widely consumed beverage in the world. Since tea contains several polyphenols and since several other naturally

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We examined the bactericidal activity of tea and catechins against Bordetella pertussis. Green tea, black tea and coffee showed marked bactericidal activity at their concentrations in beverages, while pu-erh tea killed the bacteria in a moderate way.

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Background

Our research objective is to develop nontoxic cancer chemopreventive agents and to apply these agents in treating humans. We are identifying agents that inhibit the process of tumor promotion in two-stage carcinogenesis experimen

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A major purpose of this study was to examine inhibitory effect of the catechin derivatives from Japanese green tea Camellia sinensis on collagenase activity. The crude tea catechins, which contain (+)-catechin (C), (-)-epicatechin (EC), (+)-gallocate

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Background

Studies in laboratory animals have suggested inhibitory effects of green tea on the induction of some cancers, notably, esophageal cancer. However, only a few epidemiologic studies have evaluated green tea as a potential inhibito

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A ninhydrin positive compound (L2) now identified as 2-amino-5-(N-ethylcarboxyamido)-pentanoic acid, from unprocessed tea leaves was a potent inhibitor of thrombin-stimulated thromboxane formation in rabbit whole blood (Ali and Afzal; Prostaglandins,

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Inhibition of mammary gland carcinogenesis by green tea catechins and other naturally occurring antioxidants in female Sprague-Dawley rats pretreated with 7,12-dimethylbenz[alpha]anthracene.
Effects of the naturally occurring antioxidants on mam

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Macular degeneration is the leading cause of blindness for the over-65's in the US. A large study by the Eye Disease Case-Control Study Group has found that a high intake of carotenoids (found most abundantly in yellow vegetables such as carrots and

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A new study suggests that drinking at least a half cup of tea a day doubles a woman's chances of getting pregnant. The study, reported in the American Journal of Public Health, said that one explanation for this effect may be a chemical component in

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Tea

According to Dutch research, drinking tea protects against the build-up of cholesterol in the arteries, especially in women. Results indicated that people who drank one to two cups of tea a day were 46% less likely to develop severe atherosclerosis,

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The British Medical Journal has published a Japanese study on the benefits of green tea consumption in preventing cardiovascular disease, liver disorders and possibly cancer. The study, begun in 1986, concerned 1371 men over the age of 40. Tea cons

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We are happy to offer more research confirming the benefits of green tea, our favourite drink. A study on rats with carcinoma of the mammary gland showed that the group treated with green tea catechins had a significantly higher survival rate and the

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Yet more information flows in about the beneficial effects of tea. Scientists in Hunan Province, China have discovered that catechol, or catechin, in tea can lead to cancer cells "committing suicide". The most effective kind of tea is non

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Now we can not only drink green tea but cover ourselves with it. Excited by the proven antioxidant properties of green tea when applied to the skin, cosmetic companies are increasingly using it in their skin products. The Estee Lauder company, for ex

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More exciting tea studies continue to pour in. In recent months, the following discoveries have been reported:
Epigallocatechin gallate, or EGCG, an antioxidant found in green tea is at least 100 times more effective than vitamin C and 25 times

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A Chinese study has shown that men who drink at least 1 cup of green tea per week for 6 months have a reduced risk of cancer of the colon, rectum or pancreas (Int. J. Cancer 1997, 70, 255-258). Research at the Karolinska Institute in Stockholm, Swede

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Studies in mice suggest that green tea antioxidants may have a powerful effect in reducing the incidence and severity of rheumatoid arthritis. Polyphenols (antioxidants found in green tea) possess much more potent antioxidant activity than well-known

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According to Dutch research, drinking tea protects against the build-up of cholesterol in the arteries, especially in women. Results indicated that people who drank one to two cups of tea a day were 46% less likely to develop severe atherosclerosis,

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Previous studies have shown that green tea contains powerful anti-oxidants that fight harmful free radicals. This enables green tea to reduce the risk and prevent the development of many cancers. But the effect of green tea is not limited to internal

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Green tea is already thought to protect against some cancers because it contains antioxidants. A recent review of previous studies finds drinking green tea may help prevent skin cancer

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White tea almost exclusively comes from Fukien Province in China and is so-named because it has a higher proportion of buds to leaves, compared to other tea, and the buds are covered with silver coloured hairs. It is the most minimally processed of

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For decades the British have been engaged in a polite debate between the MIF (milk in first) faction and the TIF (tea in first) faction, when discussing how to make the perfect cup of tea. More seriously, research has recently focused on whether ad

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A joint US-Chinese study carried out in China compared green tea consumption among 133 stomach cancer patients, 166 patients with colonic gastritis and 433 people with no stomach disease. They found that people who drank one to three cups of green

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Drinking tea may help prevent tooth decay. A study carried out at the University of Illinois, USA has shown that bacteria present in dental plaque stopped growing when people rinsed their mouths with black tea five times for 30 seconds over a 15 minu

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Studies on mice indicate that green tea might help slow the muscle degeneration seen in Duchenne muscular dystrophy, possibly by reducing oxidative stress. The lowest effective dose in the study corresponded to seven cups of green tea a day for hum

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In a study of 1900 patients hospitalised with confirmed acute myocardial infarction between 1989 and 1994, with a median follow-up of 3.8 years, it was found that there was a significant reduction in long-term mortality among moderate tea drinkers (t

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In a study of 497 men and 540 women, 30 years and older, those with a history of tea consumption of between 6 and 10 years showed higher bone mineral density of the lumbar spine than non tea drinkers, and those with over 10 years history of tea consu

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Gallotannin, a substance found in green tea, is up to 1000 times more powerful than comparable existing medicines in preventing brain damage after stroke. It is the overactivation of a normal DNA repair system (the PARP/PARG system), that causes cell

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It is now well known that the antioxidants found in tea can prevent the oxidation of low-density lipoproteins (LDL) that lead to the formation of plaque in artery walls, although very high concentrations of tea flavonoids are needed to produce this e

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Numerous studies have shown a link between the presence of Helicobactor pylori and a range of gastro-intestinal diseases, including gastric ulcers, Barretts Syndrome and oesophageal cancer. 72 patients awaiting endoscopy were recruited to a study exa

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Laboratory tests carried out at Kyushu University, in Fukuoka, Japan have demonstrated that a green tea compound (methylated epigallocatechin gallate/EGCG) blocked the production of histamine and immunoglobulin E (IgE), two compounds involved in trig

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Numerous studies have proved the cardiovascular benefits of green tea. But black tea also has benefits for the heart say researchers from the University of Arizona. A study of 3,430 adults in Saudi Arabia found that those who drank more than 6 cups

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A study carried out at Brigham and Women

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Dr. Stephen Hsu, a cell biologist in the Medical College of Georgia Department of Oral Biology, previously helped determine that polyphenols in green tea help eliminate free radicals, which can cause cancer by altering DNA, and can safeguard healthy

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Drinking green tea could help keep arthritis at bay, say scientists. Researchers at the University of Sheffield have found that two compounds found in green tea can help prevent osteoarthritis by blocking the enzyme that destroys cartilage. Green t

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In an Australian study of 254 Chinese patients with epithelial ovarian cancer and 652 healthy controls, it was found that the risk of ovarian cancer declined both with the more tea they drank and the length of time they had been drinking tea, with th

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Habitual tea drinking appears to significantly reduce the risk of developing hypertension. Of 1507 Taiwanese men and women, 600 were regular tea drinkers, defined as drinking 120ml or more a day. Compared with non-habitual tea drinkers, the risk of

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When substances extracted from green tea were given to 32 men at high risk of developing prostate cancer, only one man had developed the disease one year later, compared to nine men out of a similar group who were given only a placebo. All the men

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In a study of 60 female patients suffering from papulopustular rosacea, half were treated with a hydrophilic cream containing 2% polyphenone (green tea extract) and half to vehicle cream. All women had visible signs of papules and pustules, 20 had er

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Thirty-eight men were assigned to one of two groups, and were asked to drink a bottle of oolong tea daily, containing either 22mg or 690mg of catechins. After twelve weeks the high catechin group showed a significant reduction in body mass index, w

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There is considerable research evidence that green tea is associated with reduced risk of various forms of cancer. Now a team of Spanish and British researchers has discovered how epigallocatechin gallate (EGCG), a naturally occurring polyphenol in g

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Habitual tea drinking appears to significantly reduce the risk of developing hypertension. Of 1507 Taiwanese men and women, 600 were regular tea drinkers, defined as drinking 120ml or more a day. Compared with non-habitual tea drinkers, the risk of

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Green and black tea fed to rats for three months had a blood-sugar-lowering effect and inhibited the development of diabetic cataracts. (J. Agric. Food Chem., 53 (9), 3710 -3713, 2005).

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Stephen Hsu, probably the world

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Indian research has found that drinking black tea three times a day for a year could help prevent the development of oral cancer in subjects with leukoplakia, a disease that causes white spots to appear on mucous membranes on the tongue and in the mo

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A meta-analysis of 13 separate studies has indicated that women who have the highest intake of green tea have a 22% lowered risk of developing breast cancer compared to women with the lowest intake. The evidence for the benefits of black tea and br

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Women who drink two or more cups of tea a day appear to lower their risk of ovarian cancer by 46% compared to women who drink no tea, according to a recent Swedish study. The study found that each additional cup of tea consumed per day was associat

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A new study has confirmed the growing evidence that drinking tea, both green and black, might slow the growth of prostate cancer. The 15 men in this study, who were due for prostate surgery for cancer in five days time, were required to steep the

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The first prescription botanical drug for half a century has been approved by the US Food and Drug Administration. Veregen, a special extract made from green tea, has been approved for the treatment of genital  warts caused by the human papillom

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Antioxidant compounds in green tea could help promote exercise-induced abdominal fat loss, according to a new study from the American Society of Nutrition. Researchers recruited over 100 healthy normally sedentary adults, aged 21 to 65, with a me

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Experimental studies indicate the chemopreventive properties of green tea extract (GTE) on colorectal cancer, while epidemiologically, green tea consumption of more than ten cups daily is associated with reduced colorectal cancer risk. A Japanes

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Taking Polyphenon E, a compound containing tea polyphenols including epigallocatechin-3-gallate (EGCG), can improve serum levels of prostate cancer markers in men suffering from the condition. Twenty-six men with scheduled for radical prostatectom

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It appears that adding milk to tea negates its benefits in preventing cardiovascular disease. The caseins (proteins) in the milk interact with the catechins in the tea which are responsible for its protective effects. Sixteen postmenopausal women

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Twenty smokers who drank green tea for four weeks showed improvement in markers of atherosclerosis (reductions in soluble P-selectin levels and concentrations of oxidised LDL. (Clin Biochem 2005; 38: 84-7).

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Following press reports of studies carried out at the Mayo Clinic, Rochester, Minnesota which found that EGCG was able to kill cancer cells in vitro from patients with chronic lymphocytic leukaemia (CLL), four patients with low grade B-cell malig

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Epigallocatechin-3-gallate (EGCG), an ingredient of green tea, has been found to significantly reduce production of beta-amyloid, an Alzheimer's-related protein, which can accumulate abnormally in the brain and lead to nerve damage and memory los

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Regular green tea consumption appears to be associated with a reduced risk of cognitive decline, according to a study of more than 1000 Japanese adults in their 70s. Those who drank two or more cups of green tea a day were half as likely to show

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A meta-analysis of studies into the relationship of tea drinking to the risk of developing breast cancer, has found a 20% reduction with high green tea consumption, with no comparable benefit for black tea (with some studies showing a small incre

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The effect of black tea consumption on ovarian cancer risk was recently investigated. A case

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In a study of over 40,000 Japanese adults enrolled in the Ohsaki National Health Insurance Cohort Study initiated in 1994, it was found that those who drank five or more cups of green tea a day had a death rate that was 26% lower than non tea dri

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Tea has long been hailed as a stress reliever, but this has seldom been tested scientifically. A recent human study has found that people who drank tea four times a day, for six weeks, had lower blood cortisol levels and were able to recover more

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The traditional method of making tea in Britain has always been to let the tea brew for at least five minutes. A recent study has now found that tea which is brewed for longer has higher concentrations of flavonoids and shows more antioxidant act

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Evidence for the benefits of green tea continues to mount. A study of nearly 70,000 Chinese women showed a significant reduction in the risk of developing colorectal cancer in women who drank green tea regularly, with the greatest reduction among

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Components of black tea can mimic the action of insulin and could have the potential to combat type 2 diabetes and the ageing process. Scottish scientists added various tea polyphenols (theaflavins and thearubigins) to human cell cultures and inv

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Not to be out-done by its greener cousin, black tea

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Evidence for the manifold benefits of green tea continues to mount. A study of nearly 70,000 Chinese women showed a significant reduction in the risk of developing colorectal cancer in women who drank green tea regularly, with the greatest reduct

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Consuming green tea may reduce the risk of developing advanced prostate cancer. A Japanese cohort study followed 49,920 men aged 40-69 years over 14 years. All had completed a questionnaire at baseline that included information about their green

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Drinking green tea before exercise could help burn fat. American scientists carried out studies on 12 healthy young men, who took either green tea extract (GTE), equivalent to 3.5 cups of tea, or placebo before taking part in cycling trials. Aver

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Extracts from green tea can stop the build-up of fatty deposits in the liver. The incidence of nonalcoholic fatty liver disease (NAFLD) has risen along with the obesity epidemic. Green tea extract (GTE) has been shown to inhibit intestinal lipid

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A cohort study of 2501 people from Singapore has found that regular tea consumption is associated with lower risks of cognitive impairment and decline. The effects were most evident for black (fermented) and oolong (semi-fermented) teas. In contr

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Green tea can increase arterial dilation, which is linked to better cardiovascular health. Researchers from Greece tested subjects after they consumed green tea, 125mg of caffeine and 450ml of hot water on three separate occasions. They measure

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In a Taiwanese randomised controlled trial, 78 obese women who took 400mg of green tea extract three times a day for 12 weeks experienced significant reduction in LDL-cholesterol and triglyceride levels, and a simultaneous increase in levels of H

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A cross-sectional study examining long-term tea consumption has observed a reduced prevalence of type 2 diabetes (DM 2) among elderly people living in the Mediterranean islands. Analysis revealed that drinking 1 - 2 cups of tea per day was associ

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According to findings from a recent meta-analysis, drinking 3 or more cups of tea a day may help to reduce the risk of stroke and death from stroke by 21%. Arab, L., Liu, W. and Elashoff, D. (2009). Green and black tea consumption and risk of st

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