It appears that green tea can help fight gastrointestinal carcinogenesis. This is the process by which normal cells in the gastrointestinal tract can be transformed into cancer cells.
Green tea has been found to contain high levels of antioxidants which are considered very beneficial in the fight against cancer. Antioxidants are compounds that can oxidize very easily, or in other words sacrifice one of their molecules to carcinogens, which are compounds looking to steal molecules from normal, healthy cells.
Carcinogens, or free radicals, in the body are considered cancer causing agents because they damage the body's cells by stealing molecules. This can cause the cells to grow out of control, thus developing into cancer cells.
Green tea is thought to be extremely beneficial because the tea leaves are fresh and unfermented, thus preserving the antioxidants, called catechins, present in the leaves. The tea leaves come from the plant Camellia sinensis, which is the same plant that black tea comes from. The difference lies in how the leaves are treated. . T
he black tea leaves undergo the oxidation process, which oxidizes much of the specific antioxidants that are present in the green tea leaves. Of course, black teas have been found to contain many beneficial and unique antioxidants of their own, but do not contain the same amount of antioxidants as green tea.
These catechins found in green tea are considered better and stronger antioxidants than those found in black tea because they are water soluble and oxidize very easily, giving them a better chance of neutralizing free radicals before they have that chance to damage the body's cells.
There are currently 30 epidemiological studies of green tea's use in the prevention of cancer. However, there are very few studies on the treatment of preexisting cancers with green tea. A majority of the studies on green tea deal with whether the antioxidants present in the tea leaves help prevent gastrointestinal cancers.
One particular study on laboratory rats showed that 93.8% of a group of rats fed the extracted catechins from green tea survived after exposure to a strong mammary carcinogen (DMBA). This is compared to only 33.3% of the control group of rats not fed the protective catechins.
In another study was conducted on 1004 Chinese men: 190 of who had gastric cancer, 42 of whom had esophageal cancer, and 772 of whom were cancer free.
These men were studied over the course of 4 to 12 years. Those participants who were known to drink green tea on a regular basis showed a 50% lower risk of developing gastric and esophageal cancers.
This is a significant difference. It basically means that 50% fewer participants in the tea drinker's group developed cancer than of those in the group found not to drink tea on a regular basis.
There are a total of about eight studies that show drinking green tea on a regular basis can reduce the risk of stomach cancer. It's possible that green tea is also more effective in the prevention of esophageal and stomach cancers because it moves through the intestinal tract and is in direct, prolonged contact with those tissues.
Many researchers are saying that it is still too early to state conclusively that green tea can help to protect its drinkers from developing gastrointestinal cancers or even help fight the cancer that has all ready developed.
However, the current clinical studies look promising. Many tea drinkers claim the possible benefits of drinking green tea outweigh any small inconveniences.
Green tea has been used for hundreds of thousands of years in China and Japan. In fact, the numbers indicating the risks of developing gastrointestinal cancers in those two countries are among the lowest in the world
Not all green teas are the same. There is a wide variance among green teas concerning freshness, consistency, and concentration of the antioxidants in the teas. Information about the concentration of the antioxidants can sometimes be found on the packaging.
It is best to find your preferred brand of green tea and stick to it, drinking the tea habitually.
With early detection, cancer is no longer an automatic death sentence. However, an initial diagnosis still brings with it a host of questions: What is the best course of treatment? Are conventional approaches best? Or are non-traditional therapies preferable�"particularly if the cancer does not seem to respond to chemotherapy and radiation.
In recent years, a great deal of emphasis has been placed on unconventional therapies for cancer. For instance, in an article in the Canadian Medical Association Journal, Elizabeth Kaegi of the Task Force on Alternative Therapies of the Canadian Breast Cancer Research Initiative discussed the fact that cancer patients are trying a number of intriguing therapies, including Essiac, Iscador, hydrazine sulfate, vitamins A, C, and E, and 714-X. But perhaps one of the most popular therapies that has been tried is green tea. In fact, go to your local convenience store and you may find jug after jug of green tea in assorted flavors. Still, you may be wondering what makes green tea so special�"and if it really can help to combat cancer.
Green Tea�"The Basics
Green tea is produced by steaming or frying the leaves of the shrub known as Camellia sinensis. The leaves, which are not fermented, are then dried. For 5,000 years, families in China and Japan have hailed green tea as a valuable stimulant and an effective remedy for stomach ailments. You can even purchase green tea in capsule form now, although the actual medicinal benefits from such capsules have yet to be established.
Dried tea leaves are far more complex than you might think. Specifically, they are made up of phytochemicals, plant alkaloids, proteins, carbohydrates, fiber, phenolic acids, and minerals. Of course, the exact composition of the leaves varies, depending on when the leaves are harvested and how they are processed. You should also be aware of the fact that the composition of green tea varies from that of black tea, since black tea has fewer polyphenols because of the fermentation process.
Side Effects
Green tea can contain anywhere from 10 to 80 milligrams of caffeine�"the actual amount depends on how it has been produced and stored. Since caffeine is a known stimulant, green tea may lead to a racing heart rate and insomnia. As a result, heart patients, pregnant women, and nursing mothers should ideally drink no more than two cups of green tea a day.
Cancer Prevention
Numerous scientific studies have explored the use of green tea as a cancer preventative. According to Kaegi, digestive cancers appear to be particularly responsive to green tea. In fact, such tea appears to somewhat decrease the risk of experiencing cancer of the digestive tract. Given the fact that such conclusions are the result of a number of epidemiological studies, it appears that the idea that green tea can prevent cancer has some merit.
News from the Lab
But what about treating cancer? Can green tea be as effective in treatment as it is in prevention? There has been some limited lab work investigating the possibility that green tea can be used as an alternative form of cancer treatment. However, at this point, there have only been a few animal studies and no human studies. The results of these studies are, at this point, inconclusive.
Yet, it should be noted that one study showed that, if extracts of green tea are applied to mouse skin, it appears to stop the development of skin cancer when known carcinogens have been applied to the skin. Other research indicates that green tea can stop the growth of tumors or decrease the number of tumors in animals that have been exposed to cancer-causing agents.
In some animals, green tea and tea extracts prevented cancer cells from metastasizing. There are also indications that green tea extracts can prevent chromosomal abnormalities that can lead to cancer, as well as reduce the size of breast and prostate tumors.
The Magic of EGCG
Green tea contains an antioxidant known as epigallocatechin gallate, or EGCG. This substance appears to inhibit enzymes which are responsible for cell replication, stop the adhesion of cells, and disrupt the communication pathways which enable cell division to occur. However, EGCG seems to be most critically important as an antioxidant.
Final Conclusions
Researchers believe that there is evidence to suggest that green tea can be used to treat cancer. However, scientists add that additional research is absolutely essential in order to determine the full range of treatment that green tea might provide. For instance, researchers must determine which cancers are most likely to be abated through the use of green tea or green tea extracts.
Since there is also evidence to indicate that green tea can prevent cancer as well, drinking green tea is not only safe�"it’s also highly recommended by some medical experts. Therefore, green tea may not just be a thirst-quencher�"it may also be a key ingredient of a healthy diet.
Both Marcus Stout & Jon Stout are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
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