Green Tea Benefits – Tea has been cultivated for centuries, beginning in India and China. Today, tea is the most widely consumed beverage in the world, second only to water. Hundreds of millions of people drink tea. There are three main varieties of tea — green, black, and oolong. The difference is in how the teas are processed. Green tea is made using the leaves of the Chinese Camellia sinensis plant that are then applied to heat quickly after picking, either by steam or by dry cooking in hot pans. These methods minimizes oxidation and reportedly contains the highest concentration of powerful antioxidants called polyphenols. Green tea is made from unfermented leaves and . Studies suggest that green tea (Camellia sinesis) in particular has many health benefits.
People have been talking about green tea benefits for many years now, and with over a decade of research on the health benefits of green tea, it’s easy to see why so many people regularly drink it.
Antioxidants are substances that fight free radicals — damaging compounds in the body that change cells, damage DNA, and even cause cell death. Many scientists believe that free radicals contribute to the aging process as well as the development of a number of health problems, including cancer and heart disease. Antioxidants such as polyphenols in green tea can neutralize free radicals and may reduce or even help prevent some of the damage they cause.
In traditional Chinese and Indian medicine, practitioners used green tea as a stimulant, a diuretic (to help rid the body of excess fluid), an astringent (to control bleeding and help heal wounds), and to improve heart health. Other traditional uses of green tea include treating gas, regulating body temperature and blood sugar, promoting digestion, and improving mental processes.
Results from these studies suggest that green tea may help treat the following health conditions:
Lowers Risk of Cancer
Although the studies of how green tea affects cancerous cells are still in their infancy, there have been human trials which indicate that it does inhibit cells from developing cancer. Several population-based clinical studies have shown that both green and black teas may help protect against cancer. For example, cancer rates tend to be low in countries such as Japan where people regularly consume green tea. However, it is not possible to know for sure from these population-based studies whether green tea actually prevents cancer in people.
Bladder cancer. Only a few clinical studies have examined the relationship between bladder cancer and drinking tea. In one study that compared people with and without bladder cancer, researchers found that women who drank black tea and powdered green tea were less likely to develop bladder cancer. A follow-up clinical study by the same group of researchers revealed that people with bladder cancer — particularly men — who drank green tea had a better 5-year survival rate than those who did not.
Breast cancer. Clinical studies in animals and test tubes suggest that polyphenols in green tea inhibit the growth of breast cancer cells. In one study of 472 women with various stages of breast cancer, researchers found that women who drank the most green tea had the least spread of cancer. It was especially true in premenopausal women in the early stages of breast cancer. They also found that women with early stages of the disease who drank at least 5 cups of tea every day before being diagnosed with cancer were less likely to have the cancer come back after they finished treatment. However, women with late stages of breast cancer had little or no improvement from drinking green tea. There is no clear evidence one way or the other about green tea and breast cancer prevention. In one very large study, researchers found that drinking tea, green or any other type, was not associated with a reduced risk of breast cancer. However, when the researchers broke down the sample by age, they found that women under the age of 50 who consumed 3 or more cups of tea per day were 37% less likely to develop breast cancer compared to women who didn’t drink tea.
Ovarian cancer. In a clinical study done with ovarian cancer patients in China, researchers found that women who drank at least one cup of green tea per day lived longer with the disease than those who didn’t drink green tea. In fact, those who drank the most tea, lived the longest. But other studies found no beneficial effects.
Colorectal cancer. Clinical studies on the effects of green tea on colon or rectal cancer have showed conflicting results. Some studies show decreased risk in those who drink the tea, while others show increased risk. In one study, women who drank 5 or more cups of green tea per day had a lower risk of colorectal cancer compared to non-tea-drinkers. There was no protective effect for men, however. Other studies show that drinking tea regularly may reduce the risk of colorectal cancer in women. More research is needed before researchers can recommend green tea for the prevention of colorectal cancer.
Esophageal cancer. Studies in laboratory animals have found that green tea polyphenols inhibit the growth of esophageal cancer cells. However, studies in people have produced conflicting findings. For example, one large-scale population-based clinical study found that green tea offered protection against the development of esophageal cancer, particularly among women. Another population-based clinical study found just the opposite — green tea consumption was associated with an increased risk of esophageal cancer. In fact, the stronger and hotter the tea, the greater the risk. Given these conflicting results, more research is needed before scientists can recommend green tea for the prevention of esophageal cancer.
Lung Cancer. While green tea polyphenols have been shown to inhibit the growth of human lung cancer cells in test tubes, few clinical studies have looked at the link between drinking green tea and lung cancer in people. And even these studies have been conflicting. One population-based study found that Okinawan tea — similar to green tea but partially fermented — was associated with lower lung cancer risk, particularly among women. But a second clinical study found that green tea and black tea increased the risk of lung cancer. More studies are needed before researchers can draw any conclusions about green tea and lung cancer.
Pancreatic Cancer. In one large-scale clinical study researchers compared green tea drinkers with non-drinkers and found that those who drank the most tea were less likely to develop pancreatic cancer. This was particularly true for women — those who drank the most green tea were half as likely to develop pancreatic cancer as those who drank less tea. Men who drank the most tea were 37% less likely to develop pancreatic cancer. However, it is not clear from this population-based study whether green tea is solely responsible for lowering pancreatic cancer risk. More studies in animals and people are needed before researchers can recommend green tea for the prevention of pancreatic cancer.
Prostate cancer. Laboratory studies have found that green tea extracts prevent the growth of prostate cancer cells in test tubes. In a large clinical study in Southeast China researchers found that the risk of prostate cancer went down with increasing frequency, duration and quantity of green tea consumption. However, both green and black tea extracts also stimulated genes that cause cells to be less sensitive to chemotherapy drugs. People who are undergoing chemotherapy should ask their doctors before drinking green or black tea, or taking tea supplements.
Skin cancer. The main polyphenol in green tea is epigallocatechin gallate (EGCG). Scientific studies suggest that EGCG and green tea polyphenols have anti-inflammatory and anticancer properties that may help prevent the development and growth of skin tumors.
Stomach cancer. Laboratory studies have found that green tea polyphenols inhibit the growth of stomach cancer cells in test tubes, but studies in people have been less conclusive. In two studies that compared green tea drinkers with non-drinkers, researchers found that people who drank tea were about half as likely to develop stomach cancer and stomach inflammation as those who did not drink green tea. However, a clinical study with more than 26,000 men and women in Japan found no association between green tea and stomach cancer risk. Some studies even suggest that green tea may increase the risk of stomach cancer. More clinical studies are underway to see whether green tea helps reduce the risk of stomach cancer.
Eases the Pain of Rheumatoid Arthritis
Study results reported in the Proceedings of the National Academy of Sciences shows that polyphenol antioxidants in green tea benefits suffers of arthritis by reducing the incidence and severity of the disease. EGCG protects cartilage destruction and reduces joint swelling and pain. This leads many scientists and health professionals to recommend green tea as a legitimate remedy for treating arthritis.
Stabilizes Cholesterol Levels
Researchers believe that green tea lowers cholesterol levels by reducing its absorption in your digestive tract and increasing the rate of which it is excreted. One population-based clinical study found that men who drink green tea are more likely to have lower total cholesterol than those who do not drink green tea. Results from one animal study suggest that polyphenols in green tea may block cholesterol from being absorbed in the intestine and also help the body get rid of cholesterol. In another small study of male smokers, researchers found that green tea significantly reduced blood levels of harmful LDL cholesterol.
Prevents Cardiovascular Disease
A Japanese study published in the Journal of the American Medical Association showed significant reductions in deaths from cardiovascular disease among green tea drinkers. The study found that over an 11 year test period, individuals who drank more than 5 cups per day had a 16% less chance of mortality and mortality related to cardiovascular disease when compared to individuals who drank less than one cup per day. They also found that green tea was especially beneficially in preventing strokes, due in large part to the antioxidants and how they prevent clogged arteries.
Boosts the Immune System
Catechins, the antioxidant polyphenol compounds, have been shown to have a major impact in the immune system. Research conducted by the Brigham and Women’s Hospital in 2003 revealed that theanine, found in green tea, boosted the activity of the gamma delta T cells that form part of our adaptive and innate immunity. The study followed a group of coffee drinkers and a group of tea drinkers who each drank 600ml of their drink daily. Blood samples taken four weeks later quite clearly showed that production of these anti-bacterial proteins were five times higher in those drinking tea.
Promotes Weight Loss
Clinical studies suggest that green tea extract may boost metabolism and help burn fat. One study found that the combination of green tea and caffeine improved weight loss and maintenance in people who were overweight and moderately obese. Some researchers think that substances in green tea known as catechins are responsible for the herb’s fat-burning effect.
Both green tea and green tea extract have been shown to fight obesity and lower LDL cholesterol – both of which ultimately lead to a reduced risk of heart disease and diabetes. The polyphenols in green tea are extremely useful for dissolving triglycerides, a substance in the liver and small intestine made up of mostly sugar and fat, and this is thought to be the reason green tea benefits fat loss.
Reduces Tooth Decay
Antibacterial properties found in green tea are also used by your body to kill the bacteria that causes plaque on your teeth. Research by the Journal of Periodontology has also shown that for every cup of green tea you drink, there is a decrease in indicators for gum disease. Fluoride is also found in green tea which helps to protect against cavities.
Effective in the Treatment of Multiple Sclerosis
In 2007, Dr. Orhan Aktas from the Institute of Neuroimmunology conducted a study of how green tea benefits sufferers of multiple sclerosis. While current patients do not have many options to prevent tissue damage and disability, he found that the flavonoid EGCG found in green tea could have a huge impact on multiple sclerosis. He concluded that EGCG is capable of directly protecting against neuronal injury in living brain tissue and that EGCG constituents may open up a new therapeutic avenue for treating MS by combining anti-inflammatory and neuroprotective capacities.
Slows the Onset of Alzheimer’s and Parkinson’s Disease
A recent report published in the journal Phytomedicine has found substantial evidence that the enzymes found in green tea protect your brain cells from damage. Another study conducted by the University of South Florida looked at the effects of antioxidant EGCG. It was shown to be a protein blocker which prevented the chemical reactions that can lead to nerve damage that can lead to Alzheimer’s and Parkinson’s.
Fights the Cause of Allergies in Your Body
Methylated epigallocatechin gallate (EGCG) has been shown to block a cells receptor involved in producing an allergic response. By blocking the production of histamine and immunoglobulin E (IgE), two compounds in the body that are chiefly involved in triggering and sustaining allergic reactions, EGCG could very well be the compound which prevents you from having watery eyes, sneezing and coughing.
Helps to Fend off Infections
Again, as one of the main benefits of green tea, EGCG has been highlighted by a study published in the Journal of Allergy and Clinical Immunology as being able to prevent infections, including the HIV virus. EGCG binds with CD4 immune system T-cell receptors and stops HIV from doing the same to reduce the risk of infection. While it is still way too early to peg green tea as a cure for HIV, an Egyptian study has shown that combining antibiotics with green tea significantly boosts the effectiveness of the antibiotic. In fact, when tested against 28 disease-causing microorganisms, green tea enhanced the bacteria killing power in every single case.
Reduces and Prevents Acne
Green tea benefits acne in a number of different ways. It’s antibacterial properties attack and kill the acne bacteria while the anti-inflammatory benefits of green tea reduce the swelling and redness. Antioxidants fight against free radicals which damage the skin and make it more susceptible to acne also help to balance hormone levels to help prevent future breakouts from happening.
Slows the Aging Process to Prevent Wrinkles
One of the latest benefits of green tea is the effect it has on your skin and the aging process. It is again down to the antioxidants that prevent cell oxidation and damage that can make you look older than you really are. Studies are mixed on this particular green tea benefit as new research has come to light which suggests the full benefits can only be had by applying green tea topically to your skin. However, many people have found that potent green tea extracts do have a positive effect on their skin, leaving it softer, more supply and younger looking.
Clinical studies that look at populations of people indicate that the antioxidant properties of green tea may help prevent atherosclerosis, particularly coronary artery disease. Population-based studies are studies that follow large groups of people over time or studies that compare groups of people living in different cultures or with different diets.
Researchers aren’t sure why green tea reduces the risk of heart disease by lowering cholesterol and triglyceride levels. Studies show that black tea has similar effects. In fact, researchers estimate that the rate of heart attack decreases by 11% with consumption of 3 cups of tea per day.
In May 2006, however, the U.S. Food and Drug Administration (FDA) rejected a petition from teamakers to allow tea labels to claim that green tea reduces the risk of heart disease. The FDA concluded that there is no credible evidence to support that claim.
Inflammatory Bowel Disease (IBD)
Green tea may help reduce inflammation associated with Crohn’s disease and ulcerative colitis, the two types of IBD. If green tea proves to help prevent colon cancer, it would also help those with IBD because they are at higher risk for colon cancer.
Green tea has been used traditionally to control blood sugar levels. Animal studies suggest that green tea may help prevent the development of type 1 diabetes and slow the progression once it has developed. In people with type 1 diabetes, their bodies make little or no insulin, which helps convert glucose or sugar into energy. Green tea may help regulate glucose in the body. A few small clinical studies have found that taking a green tea extract daily lowered the hemoglobin A1c level in people with borderline diabetes.
Population-based clinical studies have shown that men who drink more than 10 cups of green tea per day are less likely to develop liver problems. Green tea also seems to protect the liver from the damaging effects of toxic substances such as alcohol. Animal studies have shown that green tea helps protect against liver tumors in mice.
Results from several animal and human studies suggest that one of the polyphenols in green tea, known as catechin, may help treat viral hepatitis, an inflammation of the liver. In these studies, catechin was used by itself in very high amounts. It is not clear whether green tea, which has a lower concentration of catechins, would have the same benefits.
10 cups of green tea a day could cause problems because of the high level of caffeine consumed. Ask your doctor about the best way to include green tea in your treatment.
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