Get the most Anti-cancee science stories of the day, free in Anti-cancer benefits of green tea Effective antifungal remedies for candidiasis. In a study grfen with pf cancer patients in China, researchers Nutritional strategies for recovery that women who drank at least one cup of green tea per day lived longer with the disease than those who did not drink green tea. Effects of green tea, black tea, and coffee consumption on the risk of esophageal cancer: a systematic review and meta-analysis of observational studies.

Anti-cancer benefits of green tea -

Overall, findings from experimental and nonexperimental epidemiological studies yielded inconsistent results, thus providing limited evidence for the beneficial effect of green tea consumption on the overall risk of cancer or on specific cancer sites. Some evidence of a beneficial effect of green tea at some cancer sites emerged from the RCTs and from case-control studies, but their methodological limitations, such as the low number and size of the studies, and the inconsistencies with the results of cohort studies, limit the interpretability of the RR estimates.

The studies also indicated the occurrence of several side effects associated with high intakes of green tea. In addition, the majority of included studies were carried out in Asian populations characterised by a high intake of green tea, thus limiting the generalisability of the findings to other populations.

Well conducted and adequately powered RCTs would be needed to draw conclusions on the possible beneficial effects of green tea consumption on cancer risk. This review is an update of a previously published review in the Cochrane Database of Systematic Reviews , Issue 3.

Tea is one of the most commonly consumed beverages worldwide. Teas from the plant Camellia sinensis can be grouped into green, black and oolong tea, and drinking habits vary cross-culturally. C sinensis contains polyphenols, one subgroup being catechins.

Catechins are powerful antioxidants, and laboratory studies have suggested that these compounds may inhibit cancer cell proliferation. Some experimental and nonexperimental epidemiological studies have suggested that green tea may have cancer-preventative effects. To assess possible associations between green tea consumption and the risk of cancer incidence and mortality as primary outcomes, and safety data and quality of life as secondary outcomes.

We searched eligible studies up to January in CENTRAL, MEDLINE, Embase, ClinicalTrials. gov, and reference lists of previous reviews and included studies. We included all epidemiological studies, experimental i. randomised controlled trials RCTs and nonexperimental non-randomised studies, i.

observational studies with both cohort and case-control design that investigated the association of green tea consumption with cancer risk or quality of life, or both. Two or more review authors independently applied the study criteria, extracted data and assessed methodological quality of studies.

We summarised the results according to diagnosis of cancer type. In this review update, we included in total completed studies 11 experimental and nonexperimental and two ongoing studies.

This is an additional 10 experimental and 85 nonexperimental studies from those included in the previous version of the review.

Eleven experimental studies allocated a total of participants to either green tea extract or placebo, all demonstrating an overall high methodological quality based on 'Risk of bias' assessment. For incident prostate cancer, the summary risk ratio RR in the green tea-supplemented participants was 0.

The summary RR for gynaecological cancer was 1. No evidence of effect of non-melanoma skin cancer emerged summary RR 1. Consumption of green tea extracts induced a slight improvement in quality of life, compared with placebo, based on three experimental studies.

In nonexperimental studies, we included over 1,, participants from 46 cohort studies and 85 case-control studies, which were on average of intermediate to high methodological quality based on Newcastle-Ottawa Scale 'Risk of bias' assessment.

When comparing the highest intake of green tea with the lowest, we found a lower overall cancer incidence summary RR 0. Conversely, we found no association between green tea consumption and cancer-related mortality summary RR 0.

The average cup of green tea contains 50 to mg polyphenols antioxidants. Decaffeinated green tea products contain concentrated polyphenols. Caffeine-free supplements are available. Depending on the brand, 2 to 3 cups of green tea per day for a total of to mg polyphenols or to mg per day of standardized green tea extract is recommended.

Caffeine-free products are available and recommended. The use of herbs is a time-honored approach to strengthening the body and treating disease. However, herbs contain active substances that can trigger side effects and interact with other herbs, supplements, or medications.

For these reasons, people should take herbs with care, under the supervision of a practitioner knowledgeable in the field of botanical medicine. People with heart problems or high blood pressure, kidney problems, liver problems, stomach ulcers, and psychological disorders, particularly anxiety, should not take green tea.

Pregnant and breastfeeding women should also avoid green tea. People with anemia, diabetes, glaucoma, or osteoporosis should ask their health care provider before drinking green tea or taking an extract.

People who drink large amounts of caffeine, including caffeine from green tea, for long periods of time may experience irritability, insomnia, heart palpitations, and dizziness. Caffeine overdose can cause nausea, vomiting, diarrhea, headaches, and loss of appetite.

If you are drinking a lot of tea and start to vomit or have abdominal spasms, you may have caffeine poisoning. If your symptoms are severe, lower your caffeine intake and see your health care provider. If you are being treated with any of the following medications, you should not drink green tea or take green tea extract without first talking to your health care provider:.

Green tea may inhibit the actions of adenosine, a medication given in the hospital for an irregular and usually unstable heart rhythm. Green tea may increase the effectiveness of beta-lactam antibiotics by making bacteria less resistant to treatment.

Caffeine, including caffeine from green tea, may reduce the sedative effects of these medications commonly used to treat anxiety, such as diazepam Valium and lorazepam Ativan. Beta-blockers, Propranolol, and Metoprolol. Caffeine, including caffeine from green tea, may increase blood pressure in people taking propranolol Inderal and metoprolol Lopressor, Toprol XL.

These medications are used to treat high blood pressure and heart disease. Blood-Thinning Medications. People who take warfarin Coudamin should not drink green tea. Since green tea contains vitamin K, it can make this medication ineffective. Other compounds in green tea may slow blood clotting and therefore increase the blood-thinning effect of these medications.

You should not mix green tea and aspirin because they both prevent blood from clotting. Using the two together may increase your risk of bleeding.

If you are taking medications that promote blood thinning, discuss green tea consumption with your physician. The combination of green tea and chemotherapy medications, specifically doxorubicin and tamoxifen, increased the effectiveness of these medications in laboratory tests.

However, the same results have not been found in studies on people. On the other hand, there have been reports of both green and black tea extracts affecting a gene in prostate cancer cells that may make them less sensitive to chemotherapy drugs. For that reason, people should talk to their doctors before drinking black and green tea or taking tea extracts while undergoing chemotherapy.

Clozapine Clozaril. The effects of the clozapine may be reduced if taken within 40 minutes after drinking green tea. When taken with ephedrine, green tea may cause agitation, tremors, insomnia, and weight loss.

Green tea has been shown to reduce blood levels of lithium, a medication used to treat bipolar disorder. That can make lithium less effective. Monoamine Oxidase Inhibitors MAOIs. Green tea may cause a severe increase in blood pressure, called a "hypertensive crisis," when taken together with these drugs used to treat depression.

Examples of MAOIs include:. Birth control pills. Oral contraceptives can prolong the amount of time caffeine stays in the body, which may increase its stimulating effects.

A combination of caffeine, including caffeine from green tea, and phenylpropanolamine, used in many over-the-counter and prescription cough and cold medications and weight loss products, may cause mania and a severe increase in blood pressure. The FDA issued a public health advisory in November to warn people of the risk of bleeding in the brain from use of this medication and urged all manufacturers of this drug to remove it from the market.

Most drugs that contained phenylpropanolamine have been reformulated without it. Quinolone antibiotics. Green tea may make these medications more effective and also increase the risk of side effects.

These medications include:. Other medications. Green tea, especially caffeinated green tea, may interact with a number for medications, including:. To be safe, check with your health care provider before drinking or taking green tea if you also take other medications.

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February Study finds how green Anti-cancsr may prevent cancer Nutritional strategies for recovery Ani-cancer, Ind. Benecits University researchers Geren Morre and Diabetic nephropathy monitoring. James Morre pronounced MORE-aye found Anti-cancer benefits of green tea EGCg, a compound in green tea, inhibits an enzyme required for cancer cell growth and Nutritional strategies for recovery kill cultured cancer cells with no ill effect on healthy cells. The findings offer the first scientific evidence to explain precisely how this compound works within a cell to ward off cancer. The findings suggest that drinking more than four cups of green tea a day could provide enough of the active compound to slow and prevent the growth of cancer cells, she says. Although all teas come from the same botanical source, green tea differs from black tea or other teas because of the way the tea leaves are processed after they are picked. For black tea, freshly picked leaves are "withered" indoors and allowed to oxidize. Rgeen it true that green Anti-cancer benefits of green tea contains ingredients that cure cancer? Immune system fortification methods I drink it every day can it also prevent cancer? There benefuts Anti-cancer benefits of green tea clear evidence Anyi-cancer green tea can help to cure cancer. Green tea is made from the dried leaves of the plant Camellia sinensis, and contains chemicals known as polyphenols. These are antioxidants that may help to prevent DNA damage caused by free radicals, and this is why some people think that tea can help to prevent or cure cancer.