Green Tea Extract:
Green tea has long been used by the Chinese as medicine to treat headaches, body ache, poor digestion, and improve well-being and life expectancy. Green tea extract is bioflavonoid rich, and one of its main uses is fighting free radicals in your body. Green tea extract contains high level of polyphenols (a bioflavonoid), and it's also a rich source of EGCG (an antioxidant), that's over 200 times more potent than vitamin E in fighting free radicals and pro-oxidants.
The EGCG in green tea extract protects against digestive and respiratory infections, blocks the actions of carcinogens which promotes cancer, is anti-bacterial, and also helps lower cholesterol levels.
Green tea extract is also a common ingredient in many fat burners - it helps with thermogenesis and helps the metabolism of fat. It works without increasing the heart rate which is most often associated with most fat burners. With green tea, dieters get the weight loss without the jitters and side effects. Green tea extract itself is used as a weight loss supplement among its many other beneficial uses. Green tea extract also helps reduce the risk of heart disease, cancer, and has been recently show to help prevent liver failure.
History of Caffeine in Tea
Caffeine
was first discovered in tea in 1827, and was named theine. It was later
found in mate and various other plants. Eventually it was shown that
the theine of tea was identical with the caffeine of coffee, and the
term theine was then dropped. (Ref.: All About Tea by William H. Ukers)
Does Tea Contain More Caffeine Than Coffee?
While
coffee and tea are both sources of caffeine, the amounts of caffeine in
any single serving of these beverages varies significantly. An average
serving of coffee contains the most caffeine, yet the same serving size
of tea provides only 1/2 to 1/3 as much.(Ref.: Caffeine by The
Institute of Food Technologists' Expert Panel on Food Safety &
Nutrition.) One of the more confusing aspects of caffeine content is
the fact that coffee contains less caffeine than tea when measured in its dry form. The caffeine content of a prepared cup of coffee is significantly higher than the caffeine content of a prepared cup of tea.
Herbal infusions & Caffeine
All real tea comes from the same botanical, Camellia sinensis, which contains caffeine. Herbal infusions
are made from botanicals not related to Camellia sinensis, and they are
naturally caffeine free. Chamomile and Peppermint are examples of
herbal infusions (herbal tea).
What Determines Caffeine Levels?
The
amount of caffeine in coffee or tea depends on a number of factors,
including the variety of coffee bean or tea leaf, where it is grown,
particle size used, (the particular coffee " grind " or tea leaf cut),
and the method and length of brewing or steeping. Also with tea,
studies show that leaf location on the tea plant, affects content of
caffeine in that leaf. This is why the reported values in the
literature are so variable. (Ref.: Caffeine by The Institute of Food
Technologists' Expert Panel on Food Safety & Nutrition, All About
Tea by William H. Ukers)
Does Caffeine Pose Health Concerns?
During
the past decade, extensive research on caffeine in relation to
cardiovascular disease, fibrocystic breast disease, reproductive
function, behavior in children, birth defects, and cancer has
identified no significant health hazard from normal caffeine consumption.
The
U.S. Food and Drug Administration has conducted research and reviewed
the extensive scientific literature on caffeine. In a Federal Register
notice published in May 1987, the FDA stated that the agency had
reviewed " studies on teratology, reproduction behavior,
carcinogenicity, and cardiovascular disease...but found no evidence to
show that the use of caffeine in carbonated beverages would render
theses beverages injurious to health." The American Medical Association
has examined the research on caffeine and came to a similarly confident
position on its safety. A 1984 report from AMA Council on Scientific
Affairs stated, " Moderate tea or coffee drinkers probably need have no
concern for their health relative to their caffeine consumption
provided other lifestyle habits (diet, alcohol consumption) are
moderate, as well." (Ref.: International Food Information Council)
Other Botanicals that contain caffeine
- Yerba mata 30mg caffeine per 2 grams dry herb
- Guarana 50mg caffeine per 2 grams dry herb
- Cocoa 2 - 20mg caffeine per 5oz serving
Additional Facts on Caffeine
- Decaffeinated tea is not caffeine free. It still contains up to .4% by dry weight caffeine content.
- The longer the tea leaves have fermented, the greater their caffeine content.
- The smaller the tea leaf, the stronger the extraction of caffeine.
- The first and second leaves of the tea plant are believed to contain the largest amount of caffeine at 3.4 %.
| Type of Tea |
Caffeine |
Examples |
| Black tea |
Contains caffeine in nature, can be decaffeinated (removing most of the caffeine) |
English Breakfast, Chai Spice, Earl Grey |
| Oolong tea |
Contains caffeine in nature, generally less than black tea, can be decaffeinated (removing most of the caffeine) |
China Oolong, Formosa Oolong Bay Jong, Ti Kuan Yin |
| Green tea |
Contains caffeine in nature, generally less than oolong tea, can be decaffeinated (removing most of the caffeine) |
Premium Green, Kangra Green Gunpowder, Darjeeling Green |
| White tea |
Contains caffeine in nature, generally less than green tea, can be decaffeinated (removing most of the caffeine) |
Mutan White, Flowery Pekoe White, White Pearls |
| Decaffeinated tea |
Results of removing most of the caffeine from black, oolong, green, or white tea |
Decaf Earl Grey, Decaf Chai Spice, Decaf Sencha Green |
| Herbal "tea" |
Naturally caffeine free |
Chamomile, Peppermint, Lemon Blossom |
*Caffeine content (Ref.: Internation Food Information Council, All About Tea by William H. Ukers)
* Thanks to Stash Tea for the use of this information