Thursday, July 10, 2014
Monday, May 5, 2014
Thursday, March 27, 2014
My actual green tea: Tokujyou Sencha (Tenkaichi)
Made from the softest young leaf tips and medium steamed (nakamushi).
This delicate Sencha tea is one of the finest teas available in Japan.
Recommend only for the experienced tea drinker, this tea should be brewed for a short time between 70 and 80 degrees celsius.
Wednesday, March 26, 2014
How much daily green tea?
Like black tea, green tea comes from the Camellia sinensis plant. The difference between them is green tea is made with unfermented leaves, while fully fermented leaves comprise black tea. Fermentation reduces the leaves' concentration of natural antioxidant compounds, or polyphenols, making green tea higher in antioxidants than black. The polyphenols in green tea appear to be more potent antioxidants than vitamin C, according to the University of Maryland Medical Center, and drinking it in moderation may benefit your health.
Catechins
Green tea contains six different types of polyphenols from the catechin family. The most active and widely studied of these is epigallocatechin gallate, or EGCG, a powerful antioxidant compound that also has antibacterial properties, according to authors of a "British Journal of Pharmacology" article published in 2013. They also noted that drinking green tea may ward off viral infections, such as influenza, hepatitis and herpes simplex, and may offer antifungal and antibacterial benefits, preventing a wide variety of diseases.
Cardiovascular Benefits
A high dose of antioxidants prevents free radicals from damaging your cells, protecting you from illness and premature aging. Drinking green tea may help keep your blood sugar and cholesterol low, making it a beneficial beverage for diabetics and people at an elevated risk for heart disease. It also may prevent atherosclerosis, or hardened arteries, according to Brazilian researchers who published a study in "Nutrition Research" in 2012. The research team found mice that drank water infused with a low dose of green tea extract for four weeks experienced significant improvements in atherosclerotic lesions and vascular reactivity, compared to mice that drank plain water. Higher concentrations of green tea extract were less effective than lower concentrations.
Cancer Prevention
In countries where green tea consumption is high, cancer rates tend to be low. Although research has yielded mixed results, some studies have indicated a link between green tea and a reduced risk of some types of cancer. Researchers from a study published in "Biomedical Research" in 2009 treated bladder cancer cells with green tea extract and found its catechin agents significantly inhibited the cells from growing. Green tea also may treat and prevent cancers of the pancreas, skin, breast, stomach, ovaries, esophagus, lungs and prostate.
Daily Intake
The potency of green tea varies from brand to brand, as does the potential for toxicity from excessive use. An overdose of green tea can lead to liver damage and other unpleasant side effects. To maximize the health benefits of green tea safely, the UMMC recommends drinking 2 to 3 cups daily, giving you 240 to 320 milligrams of polyphenols. If you take green tea extract supplements, 100 to 750 milligrams per day is recommended. Opt for caffeine-free products when possible. Because few studies have been done on green tea's effects on children, it is safest not to give it to them.
Source: http://healthyeating.sfgate.com/green-tea-good-much-can-drink-daily-8620.html
Tuesday, March 25, 2014
The Most Common Types of Japanese Tea
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Sencha
Is the most common type of Japanese Green Tea and is brewed and served on a daily basis in most Japanese homes. Sencha is steamed and rolled soon after it is harvested. |
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Fukamushi Sencha
Fukamushi Sencha is the same as Sencha but it is steamed two or three times longer. |
Other than Sencha, there are many kinds of Japanese Teas. Below are some more common types of tea.
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Gyokuro
Gyokuro is made from from "Shinme" the first flush of tea leaves, and is shaded from sunlight for about 20 days before it is harvested and processed. Gyokuro is the highest quality tea available. |
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Tencha
Tencha is of the same class as Gyokuro and is also kept shaded from the sunlight before harvesting. The main difference is that Tencha is not rolled. |
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Matcha
Match is a fine powder made from Tencha and is dissolved in hot water rather than brewed like Sencha Teas. Matcha is recognized mostly for its use in the "Tea Ceremony". |
Additionally, there is Kabusecha which is made from the second flush of leaves and is shaded from sunlight for 5 to 15 days before harvesting.
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Bancha
After the second flush of tea leaves are harvested, the tea plant continues to grow. Bancha tea is made from the later flushes of more firm leaves and stems. It is a coarse tea. The lower quality of Bancha makes it less expensive than Gyokuro and Sench. Bancha is also a popular and commonly served tea. |
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Houjicha
Houjicha is roasted after it is dried. It is made from the remains of Bancha. Houjicha is brown in color. |
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Genmaicha
Genmaicha is a blended tea. It is made with Bancha, dry roasted brown rice and popcorn rice. It has a distinct and fragrant aroma. |
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Kukicha
Kukicha also called "stem tea" is actually what remains after sifting Gyokuro and Sencha. It has a light sweet taste and is very mild. It is often served with traditional Japanese snacks. |
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KonachaKonacha is a powdered tea and is usually made into tea bags. It is often served in Sushi restaurants.
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Source: http://www.japanesegreenteashops.com/teatypes.html |
Thursday, February 27, 2014
10 Health Benefits of Green Tea
1. Green Tea Contains Various Bioactive Compounds That Can Improve Health
Green tea is more than just green liquid. Many of the bioactive compounds in the tea leaves do make it into the final drink, which contains large amounts of important nutrients.
It is loaded with polyphenols like flavonoids and catechins, which function as powerful antioxidants (1). These substances can reduce the formation of free radicals in the body, protecting cells and molecules from damage. These free radicals are known to play a role in aging and all sorts of diseases. One of the more powerful compounds in green tea is the antioxidantEpigallocatechin Gallate (EGCG), which has been studied to treat various diseases and may be one of the main reasons green tea has such powerful medicinal properties.
Green tea also has small amounts of minerals that are important for health. Try to choose a higher quality brand of green tea, because some of the lower quality brands can contain excessive levels of fluoride (2). That being said, even if you choose a lower quality brand, the benefits still far outweigh any risk.
2. Compounds in Green Tea Can Improve Brain Function and Make You Smarter
Green tea does more than just keep you awake, it can also make you smarter. The key active ingredient is caffeine, which is a known stimulant. It doesn’t contain as much as coffee, but enough to produce a response without causing the “jittery” effects associated with too much caffeine. What caffeine does in the brain is to block an inhibitory neurotransmitter called Adenosine. This way, it actually increases the firing of neurons and the concentration of neurotransmitters like dopamine and norepinephrine (3, 4). Caffeine has been intensively studied before and consistently leads to improvements in various aspects of brain function, including improved mood, vigilance, reaction time and memory (5).
However… green tea contains more than just caffeine. It also has the amino acid L-theanine, which is able to cross the blood-brain barrier (6). L-theanine increases the activity of the inhibitory neurotransmitter GABA, which has anti-anxiety effects. It also increases dopamine and the production of alpha waves in the brain (7, 8, 9). Studies show that caffeine and L-theanine can have synergistic effects. The combination of the two is particularly potent at improving brain function (10, 11). Because of the L-theanine and the smaller dose of caffeine, green tea can give you a much milder and different kind of “buzz” than coffee. Many people report having more stable energy and being much more productive when they drink green tea, compared to coffee.
3. Green Tea Increases Fat Burning and Improves Physical Performance
If you look at the ingredients list for any fat burning supplement, chances are that green tea will be on there. This is because green tea has been shown to increase fat burning and boost the metabolic rate, in human controlled trials (12, 13).
In one study in 10 healthy men, green tea increased energy expenditure by 4 percent (14). Another study showed that fat oxidation was increased by 17 percent, indicating that green tea may selectively increase the burning of fat (15). However, I’d like to point out that some studies on green tea don’t show any increase in metabolism, so the effects may depend on the individual (16).
Caffeine itself has also been shown to improve physical performance by mobilizing fatty acids from the fat tissues and making them available for use as energy (17, 18). In two separate review studies, caffeine has been shown to increase physical performance by 11-12 percent, on average (19, 20).
4. Antioxidants in Green Tea May Lower Your Risk of Various Types of Cancer
Cancer is caused by uncontrolled growth of cells. It is one of the world’s leading causes of death. It is well known that oxidative damage contributes to the development of cancer and that antioxidants can have a protective effect (21). Green tea is an excellent source of powerful antioxidants, so it makes perfect sense that it could reduce your risk of cancer, which it appears to do:
- Breast cancer: A meta-analysis of observational studies found that whomen who drank the most green tea had a 22% lower risk of developing breast cancer, the most common cancer in women (22).
- Prostate cancer: One study found that men drinking green tea had a 48% lower risk of developing prostate cancer, which is the most common cancer in men (23).
- Colorectal cancer: A study of 69,710 Chinese women found that green tea drinkers had a 57% lower risk of colorectal cancer (24).
Multiple other observational studies show that green tea drinkers are significantly less likely to get various types of cancer (25, 26, 27). It is important to keep in mind that it may be a bad idea to put milk in your tea, because it can reduce the antioxidant value (28).
5. Green Tea May Protect Your Brain in Old Age, Lowering Your Risk of Alzheimer’s and Parkinson’s
Not only can green tea improve brain function in the short term, it may also protect your brain in old age. Alzheimer’s disease is the most common neurodegenerative disease in humans and a leading cause of dementia. Parkinson’s disease is the second most common neurodegenerative disease and involves the death of dopamine producing neurons in the brain. Multiple studies show that the catechin compounds in green tea can have various protective effects on neurons in test tubes and animal models, potentally lowering the risk of Alzheimer’s and Parkinson’s (29, 30, 31).
6. Green Tea Can Kill Bacteria, Which Improves Dental Health and Lowers Your Risk of Infection
The catechins in green tea have other biological effects as well. Some studies show that they can kill bacteria and inhibit viruses like the influenza virus, potentially lowering your risk of infections (32, 33, 34, 35).
Streptococcus mutans is the primary harmful bacteria in the mouth. It causes plaque formation and is a leading contributor to cavities and tooth decay. Studies show that the catechins in green tea can inhibit the growth of streptococcus mutans. Green tea consumption is associated with improved dental health and a lower risk of caries (36, 37, 38, 39, 40, 41).
7. Green Tea May Lower Your Risk of Type II Diabetes
Type II diabetes is a disease that has reached epidemic proportions in the past few decades and now afflicts about 300 million people worldwide. This disease involves having elevated blood sugar levels in the context of insulin resistance or an inability to produce insulin. Studies show that green tea can improve insulin sensitivity and reduce blood sugar levels (44, 45).
One study in Japanese individuals found that those who drank the most green tea had a 42 percent lower risk of developing type II diabetes (46). According to a review of 7 studies with a total of 286,701 individuals, green tea drinkers had an 18% lower risk of becoming diabetic (47).
8. Green Tea May Reduce Your Risk of Cardiovascular Disease
Cardiovascular diseases, including heart disease and stroke, are the biggest causes of death in the world (48). Studies show that green tea can improve some of the main risk factors for these diseases. This includes total cholesterol, LDL cholesterol and triglycerides (49).
Green tea also dramatically increases the antioxidant capability of the blood, which protects the LDL cholesterol particles from oxidation, which is one part of the pathway towards heart disease (50, 51, 52). Given the beneficial effects on risk factors, it is not surprising to see that green tea drinkers have up to a 31% lower risk of cardiovascular disease (53, 54, 55).
9. Green Tea Can Help You Lose Weight and Lower Your Risk of Becoming Obese
Given that green tea can boost the metabolic rate in the short term, it makes sense that it could help you lose weight. Several studies show that green tea leads to decreases in body fat, especially in the abdominal area (56, 57, 58). One of these studies was a randomized controlled trial in 240 men and women that went on for 12 weeks. In this study, the green tea group had significant decreases in body fat percentage, body weight, waist circumference and abdominal fat (59). However, some studies don’t show a statistically significant increases in weight loss with green tea, so this needs to be taken with a grain of salt (60).
10. Green Tea May Decrease Your Risk of Dying and Help You Live Longer
Of course, we all have to die eventually. That is inevitable. However, given that green tea drinkers are at a lower risk of cardiovascular disease and cancer, it makes sense that it could help you live longer. In a study of 40,530 Japanese adults, those who drank the most green tea (5 or more cups per day) were significantly less likely to die during an 11 year period (61):
- Death of all causes: 23 percent lower in women, 12 percent lower in men.
- Death from heart disease: 31 percent lower in women, 22 percent lower in men.
- Death from stroke: 42 percent lower in women, 35 percent lower in men.
Another study in 14,001 elderly Japanese individuals aged 65-84 years found that those who drank the most green tea were 76 percent less likely to die during the 6 year study period (62).
Article by Kris Gunnars
Related
Source: http://www.care2.com/greenliving/10-health-benefits-of-green-tea.html
Monday, February 10, 2014
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