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The natural antioxidant
properties
of tea may help combat the risk of developing Coronary Heart Disease. Research
has suggested that drinking around 4-5 cups of tea a day may have beneficial
effect on two long established heart disease risk factors : high blood
cholesterol and high blood pressure. Studies have shown that average blood
cholesterol and blood pressure drop, as tea consumption increases and experts
believe the flavanoids in tea are responsible for the effect. Other studies
have shown that tea flavanoids may also decrease blood clotting which is
another common cause of cardiovascular disease.
Now scientific studies are finding
that tea is rich in the plant substances known as flavanoids, which function
as antioxidants that neutralize free radicals that can damage cells and
lead to diseases such as cancer and heart disease. Researchers from several
countries and have presented evidence suggests that black teas, green teas
and oolong teas, have a protective capability against oral, lung, colon
and other cancers. Green teas especially ,with more than thirty polyphenols,
has unique beneficial effects on the human system. These polyphenols are
found in fruits and vegetables and act as antioxidants like vitamin C,E
and beta carotene and may reduce serum cholesterol and the risk of heart
disease and stroke.
Although the healthful effects have
been known to countless generations, recent research shows that drinking
tea both black and green, can lead to a long and healthy life. In addition
to being a soothing, calming beverage, tea is reported to aid digestion,
strenghten the immune system, and reduce the risk of heart disease,
all of which play a role in healthy aging. The fluoride in tea can strengthen
bones in the same way it strengthens dental enamel. Recent studies in the
United States, China and Japan found that drinking green tea inhibits the
formation action cancer causing substances, such as nitrosamines, which
are the byproducts of cooking meats and fish.
In addition to other dietary and
lifestyle factors, tea has been shown to contribute to a healthy heart.
By inhibiting the absorption of cholesterol in the digestive tract, tea
helps prevents the formation of unwanted clots which may cause a heart
attack or stroke or stroke. All types of tea, black, green and oolong,
contains some caffeine,
although the amounts vary . green tea, which is not fermented, has about
one third the caffeine per cup of black tea. Coffee by constrast, has about
twice as much caffeine as black tea.
1.The longer the tea leaves have
fermented during manufacture, the greater their caffeine content . Green
tea, which is unfermented , has one-third the caffeine per cup as black
tea, which is fully fermented. Oolong is semi-fermented and has about half
as much as caffeine as black tea.
2. The shorter the brewing time,
less caffeine ends up in the cup. A four-minute infusion of black tea will
produce40 to 100 milligrams of caffeine, a three-minute infusion only about
20 to 40 milligrams.
CAFFEINE PER 6-OZ. CUP, IN MILLIGRAMS
| Espresso (2 oz) |
60-90 mg |
| Drip coffee |
60-180 mg |
| Black tea |
25-110 mg |
| Oolong tea |
12-55 mg |
| Green tea |
8-16 mg |
| herbal tea |
0 |
3. The smaller the leaf, the stronger
the extraction of caffeine. Using comparable amounts and brewing times,
a tea bag filled with cut leaf or "dust" will release nearly twice as much
caffeine per cup as full-Leaf tea.
4. Caffeine primary effects last
about 15 to 45 minutes, depending on an individual sensitivity.
5.Scientific studies of caffeine
to date have been contradictory. There is no conclusive evidence that caffeine
causes or exacerbates any specific illness or medical condition.
One Cup of Tea Daily Can Reduce
Heart Attack Risk
By Emma Ross
The Associated Press
LONDON,July 7 - Drinking at least
one cup of tea a day could cut the risk of heart attack by 44 percent,
according to new research presented today.
Researches say the beneficial results
probably are due to the powerful amounts of natural substances in tea known
as flavors, vitamin-like nutrients that make blood cells less prone to
clotting.
Flavonoids also are one of the most
powerful antioxidants, or substances that offset the damaging effects of
oxygen in the body. Scientists have become excited about the potential
benefits of Flavonoids, which also are found in fruits and vegetables and
are famously connected to the heart-healthy effect of red wine.
While earlier studies have suggested
that tea-drinking could be good for the heart, the latest findings are
the most comprehensive and indicate the most dramatic effect.
Tea May Bolster Heart
Seems to Lower Symptoms of Heart
Disease
CHICAGO, Oct. 11 - More evidence
published Sunday indicates that tea may ward off heart disease - in this
case coronary artery disease, especially in women.
A Dutch study found that those who
drank one to two cups of tea daily lowered their risk of severe aortic
atherosclerosis, a narrowing of the arteries caused by a build-up of fat
and other substances on the inner walls, by 46 percent. At four cups a
day the risk dropped by 69 percent.
The findings, based on a study of
3,454 people in the Netherlands who were free of cardiovascular disease,
was published in this week's issue of the Chicago-based Archives of
Internal Medicine. Teas's protective effect may come from Flavonoids,
which act as antioxidants, the researchers from Eramus University Medical
School in Rotterdam said.
Are there really any benefits
gained from drinking green tea?
Green tea has a high content of
vitamins and minerals. It contains ascorbic acid (Vitamin C) in amounts
comparable to a lemon. Green tea also contains several B vitamins which
are water soluble and quickly released into a cup of tea. Five cups of
green tea a day will provide 5-10% of the daily requirement of riboflavin
,niacin, folic acid, and pantothenic acid. The same five cups of green
tea also provide approximately 0.1 mg of fluoride, which is higher than
in fluorinated water. Scientific studies have shown strong evidence that
green tea may help reduce the risk of strokes and heart disease, and may
also prevent some cancers.
To further enrich your knowledge
of green tea and its health benefits, read Green Tea - a natural elixir
How
much caffeine does tea contain?
Tea contains anywhere from 8 mg
to 110 mg per 6 ounce (200 ml) cup. Caffeine content can be a confusing
subject.
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