Green Tea
Overview
Green tea is made from the Camellia sinensis plant. The dried leaves and leaf buds of Camellia sinensis are used to produce various types of teas. Green tea is prepared by steaming and pan-frying these leaves and then drying them. Other teas such as black tea and oolong tea involve processes in which the leaves are fermented (black tea) or partially fermented (oolong tea).
Green tea is taken by mouth to reduce high levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia). It is also used to improve mental alertness and thinking, diabetes, low blood pressure, and many other conditions, but there is no good scientific evidence to support these uses.
Instead of drinking green tea, some people apply green tea bags to their skin to soothe sunburn and prevent skin cancer due to sun exposure. Green tea bags are also used to decrease puffiness under the eyes, as a compress for tired eyes or headache, and to stop gums from bleeding after a tooth is pulled, but there is no good scientific evidence to support these uses.
Green tea is used in an ointment for genital warts. This product is available by prescription.
In food, people drink green tea as a beverage.
Classification
Is a Form of:
Plant
Primary Functions:
High levels of cholesterol
Also Known As:
Benifuuki, Camellia sinensis, Camellia thea
How Does It Work?
The useful parts of green tea are the leaf bud, leaf, and stem. Green tea is not fermented and is produced by steaming fresh leaves at high temperatures. During this process, it is able to maintain important molecules called polyphenols, which seem to be responsible for many of the benefits of green tea.
Polyphenols might be able to prevent inflammation and swelling, protect cartilage between the bones, and lessen joint degeneration. They also seem to be able to fight human papilloma virus (HPV) infections and reduce the growth of abnormal cells in the cervix (cervical dysplasia). Research cannot yet explain how this works.
Green tea contains 2% to 4% caffeine, which affects thinking and alertness, increases urine output, and may improve the function of brain messengers important in Parkinson's disease. Caffeine is thought to stimulate the nervous system, heart, and muscles by increasing the release of certain chemicals in the brain called "neurotransmitters."
Antioxidants and other substances in green tea might help protect the heart and blood vessels.
Uses
- Genital warts.A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals; Polyphenon E ointment 15%, MediGene AG) is available as a prescription product for treating genital warts. Applying the ointment for 10-16 weeks seems to clear these types of warts in 24% to 60% of patients.
- Heart disease. Population studies suggest that drinking green tea is linked to a reduced risk of clogged arteries. The link seems to be stronger in men than women.
- Cancer of the lining of the uterus (endometrial cancer). Population studies suggest that drinking green tea is linked to a reduced risk of developing endometrial cancer.
- High levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia). People who consume higher amounts of green tea seem to have lower levels of total cholesterol, low-density lipoprotein (LDL or "bad") cholesterol, and blood fats called triglycerides. They also seem to have higher levels of high-density lipoprotein (HDL or "good") cholesterol. Consuming green tea or taking green tea extract containing 150 to 2500 mg of green tea catechins, an antioxidant found in green tea, daily for up to 24 weeks may reduce total cholesterol and LDL cholesterol. Early research also suggests that green tea extract might reduce damage to vein and artery walls in people with high cholesterol.
- High blood pressure. Drinking green tea might reduce the risk of developing high blood pressure. It might also slightly lower blood pressure in people with high blood pressure. But not all research agrees. Population research in Chinese people shows that drinking 120-599 mL of green tea or oolong tea daily is linked to a lower risk of developing high blood pressure. Drinking more than 600 mL daily is linked to an even lower risk. Also, early clinical research suggests that taking green tea extract daily for 3 months or drinking green tea three times per day for 4 weeks reduces blood pressure in people with high blood pressure. Analysis of clinical research shows that green tea can reduce systolic blood pressure (the top number) by up to 3.2 mmHg and diastolic blood pressure (the bottom number) by up to 3.4 mmHg in people with or without high blood pressure. But several smaller studies show that green and black tea have no effect on blood pressure.
- Ovarian cancer. Women who regularly drink tea, including green or black tea, appear to have a lower risk of developing ovarian cancer. But green tea does not seem to prevent ovarian cancer from recurring in people with a history of ovarian cancer.
- Parkinson disease. Some research shows that drinking caffeinated beverages can reduce the risk of Parkinson disease. Drinking one to four cups daily seems to provide the most protection against developing Parkinson disease.
Green Tea Supplements Recommended Dosing
The following doses have been studied in scientific research:
BY MOUTH:
- For high levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia): Green tea or green tea extracts containing 150 to 2500 mg catechins, taken in single or 2 divided doses daily for up to 24 weeks, has been used.
- For abnormal cells on the surface of the cervix (cervical dysplasia): 200 mg of green tea extract, taken by mouth daily along with a green tea ointment applied twice weekly for 8-12 weeks, has been used.
- For high blood pressure: A green tea drink, made by boiling a 3 gram tea bag with 150 mL water, has been used three times daily about 2 hours after each meal for 4 weeks. Also, 379 mg of a specific product containing green tea extract (Olimp Labs, Debica, Poland), taken daily with the morning meal for 3 months, has been used.
- For low blood pressure: 400 mL of green tea taken before lunch has been used.
- For white patches inside the mouth that are usually caused by smoking (oral leukoplakia): 3 grams of mixed green tea taken by mouth and applied to the skin for 6 months has been used.
APPLIED TO THE SKIN:
- For genital warts: A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals; Polyphenon E ointment 15%, MediGene AG) applied three times daily to warts for up to 16 weeks, has been used. This product is FDA-approved for treating this condition.
- For abnormal cells on the surface of the cervix (cervical dysplasia): A green tea ointment has been used alone twice weekly, or in combination with 200 mg of green tea extract taken by mouth daily for 8-12 weeks.
- For white patches inside the mouth that are usually caused by smoking (oral leukoplakia): 3 grams of mixed green tea taken by mouth and applied to the skin for 6 months has been used.
Frequently Asked Questions
Are green tea supplements as good as green tea?
Dec. 15, 2004 -- You may absorb more, powerful antioxidants by taking green tea supplements than by sipping on green or black tea drinks, according to new research. Antioxidants called polyphenols are thought to be responsible for tea's health benefits.
Do green tea supplements help you lose weight?
MYTH: Green-tea supplements burn fat
“Green-tea extract may promote weight loss,” says Anding. But taking a green-tea supplement—or drinking cup after cup of the tea itself—isn't likely to produce significant or lasting weight loss.
What is the best green tea supplement?
- A Bulk Supplements Green Tea Extract.
- Hard Rhino Pure Green Tea Extract.
- B Nutrigold Decaffeinated Green Tea Gold.
- C+ VitaSage Green Tea Extract.
- C+ Primaforce Lean Green.
- C+ Zenwise Labs Advanced Green Tea Extract.
- C+ Advanta Supplements Green Tea X-Tract.
- C Buddha's Herbs Decaffeinated Green Tea Extract.
Are green tea supplements harmful?
Consuming too many of the supplements can have a harmful effect on your liver, according to the European Food Safety Authority (EFSA). Taking a green tea supplement is a bit different than drinking green tea, which the agency says is generally safe.
What happens if I drink green tea everyday?
Regularly drinking green tea can help you lose weight and reduce your risk of several diseases, including diabetes, heart disease and cancer. Drinking three to five cups of green tea per day seems to be optimal to reap the most health benefits. In fact, drinking more green tea may greatly improve your health.
Who should not take green tea?
Also, green tea might increase the risk of birth defects associated with folic acid deficiency. In women who are nursing, caffeine passes into breast milk and can affect a nursing infant. Nursing mothers should closely monitor caffeine intake to make sure it is on the low side (2-3 cups per day).
How many cups of green tea a day should I drink to lose weight?
Drinking between 2 and 3 cups of hot green tea throughout the day should be sufficient for supplementing weight loss. The exact amount will vary from person to person, depending on how much caffeine they consume and their natural metabolism.
What is the best time to drink green tea for weight loss?
For weight loss, you can have green tea right after your meals. But you should do it if you do not have a sensitive stomach because green tea is alkaline in nature and stimulates the secretion of extra-gastric juices. Experts also suggest to have green tea right in the morning and later in the evening.
Why green tea is bad for you?
In some people, green tea can cause stomach upset and constipation. Green tea extracts have been reported to cause liver and kidney problems in rare cases. Green tea is POSSIBLY UNSAFE when taken by mouth long-term or in high-doses. It can cause side effects because of the caffeine.
Is green tea bad for your kidneys?
Green tea is good for you, but only if drunk in moderation. While the polyphenols in green tea are credited with preventing heart disease and cancer, it seems they can cause liver and kidney damage if consumed in very large quantities, a review of studies into the toxicity of polyphenols has shown.
Is it better to drink green tea or take supplements?
Anything ingested in its purest form is more beneficial to the body. A warm cup of freshly brewed green tea is any day better than popping a supplement pill. ... These capsules give you almost the same health benefits as drinking green tea would, only if you exercise caution.
What are disadvantages of green tea?
In some people, green tea can cause stomach upset and constipation. Green tea extracts have been reported to cause liver and kidney problems in rare cases. Green tea is POSSIBLY UNSAFE when taken by mouth long-term or in high-doses. It can cause side effects because of the caffeine.
Is green tea a laxative?
Green tea also seems to have positive effects on digestive health. It has been used to help treat nausea, diarrhea, and constipation. Hot or iced black tea may have a mild enough laxative effect that it can help prevent constipation, but you can consume it daily without long-term health risks.
What is the healthiest green tea?
Matcha Is Healthier Than Regular Green Tea
Since the leaves are ground into powder, you end up consuming the whole leaf. For this reason, matcha may have even more benefits than regular green tea. Just make sure not to consume more than 2 cups (474 ml) per day.
Is one cup of green tea a day enough?
Some studies show health benefits in people who drink as little as one cup per day, while other studies deem five or more cups per day to be optimal (15, 16 ). Green tea may help lower the risk of several diseases. However, the optimal amount to drink may depend on the disease.
When should I drink green tea for a flat stomach?
According to Nutritionist Mehar Rajput of FITPASS, "The ideal time to have green tea is right after your breakfast and lunch when your metabolism rate is higher. Intake of green tea during this period will only help boost metabolism rate, further helping the food to digest better and faster."
Can I drink green tea on empty stomach?
Drinking green tea on an empty stomach can cause an upset stomach. Green tea has polyphenols known as tannins that increase stomach acid, which further leads to stomachache, nauseous feeling, burning sensation or even constipation. You must drink green tea in between meals or after a meal.
Can I drink green tea at night?
Green tea may provide an array of health benefits, including better sleep. However, drinking it at night, especially in the two hours preceding bedtime, may make it harder to fall asleep. It may also lead to more nighttime peeing, which can further reduce your sleep quality.
Is green tea good for skin?
Green tea contains a powerful antioxidant called EGCG that fights DNA damage from UV rays to prevent skin cancer. That means it's also a potent anti-aging ingredient that combats signs of aging when ingested or applied topically. ... Green tea is powerful antibacterial agent for treating acne and unclogging pores.
Does green tea burn belly fat?
Green Tea Can Help You Lose Fat, Especially Harmful Abdominal Fat. When it comes to actual pounds lost, the effects of green tea are relatively modest. Although many studies show that people do in fact lose weight, there are also some studies showing no effect.
Clinical Studies
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