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| 8-18-2008 |
Dr. Paul's Tea & Health Update |
#86a |
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WILL TEA REDUCE THE INCIDENCE OF DIABETES?
Diabetes, particularly type 2 diabetes, is becoming epidemic in many parts of the world. Nearly 200
million people have diabetes today (about 5% of the worldwide population) and this is expected to increase to over 300
million in the next 15-20 years. Is it possible that if more of us drank tea on a regular basis that our risk of
diabetes would be decreased? The following study helps answer this question.
Tea consumption may improve biomarkers of insulin sensitivity and risk factors for diabetes.
J Nutr. 2008 Aug;138(8):1584S-1588S. Stote KS, Baer DJ.
Click Here for PubMed Abstract of Study
This review study recognizes the evidence showing that:
"tea may affect glucose metabolism and insulin signaling..."
It concludes that:
"Epidemiologic studies suggest some relation between tea consumption and a reduced risk of type 2 diabetes..."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 8-18-2008 |
Dr. Paul's Tea & Health Update |
#86b |
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WILL TEA IMPROVE ATTENTION TASK PERFORMANCE BETTER THAN COFFEE?
Tea contains both L-theanine and caffeine while coffee contains (larger amounts) only caffeine. Will the
combined affect of L-theanine and caffeine improve attention task performance better than caffeine alone? The following
study addresses this question.
L-theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance.
J Nutr. 2008 Aug;138(8):1572S-1577S. Kelly SP, et.al.
Click Here for PubMed Abstract of Study
This study evaluated the possible modulatory effects of (1) a placebo, (2) the combination 100 mg L-theanine,
50 mg caffeine, and (3) caffeine alone on both visuspatial attention performance and alpha-band activity in human subjects. The
study found:
"an increase in hit rate and target discriminability (d') for the combined treatment relative to placebo, and
an increase in d' but not hit rate for caffeine alone, whereas no effects were detected for L-theanine alone."
The data also showed:
"lower overall tonic alpha power in the combined treatment, similar to previous findings at a larger dosage
of L-theanine alone."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 8-18-2008 |
Dr. Paul's Tea & Health Update |
#86c |
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IS GREEN TEA MORE PROTECTIVE AGAINST CARDIOVASCULAR DISEASE IN WOMEN THAN IN MEN?
This epidemiological study examines a possible inverse relationship between green tea consumption and
cardiovascular disease (CVD) in humans. It also evaluated possible differences between green tea consumption in men and women.
The relation between green tea consumption and cardiovascular disease as evidenced by epidemiological studies.
J Nutr. 2008 Aug;138(8):1548S-1553S. Kuriyama S.
Click Here for PubMed Abstract of Study
This population-based prospective cohort study was part of the larger Ohsaki Study in over 40
thousand individuals in Northern Japan. The study found an:
"inverse association of mortality from CVD...more pronounced in women..."
The study results also found a:
"stronger inverse association...for stroke mortality."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 8-25-2008 |
Dr. Paul's Tea & Health Update |
#87a |
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WILL ECg OF GREEN TEA REDUCE ATHEROSCLEROSIS-RELATED FOAM CELL FORMATION?
Foam cell formation in the artery wall lining is a frequent, early step leading to atherosclerotic plaque
formation which, in turn, leads to cardiovascular disease.
Note: ECg [(-)-Epicatechin gallate], like EGCG, is a major component of green but not black tea.
Note: Foam cells are lipid-laden (cholesterol-laden) macrophage-related cells that accumulate in the inner lining of the
artery wall as part of the progression toward cardiovascular diseases such as heart attack and stroke.
(-)-Epicatechin gallate accumulates in foamy macrophages in human atherosclerotic aorta: Implication in the anti-atherosclerotic actions of tea catechins.
Biochem Biophys Res Commun. 2008 Jul 25. Kawai Y, et.al.
Click Here for PubMed Abstract of Study
The investigators found that:
"ECg could suppress the gene expression of a scavenger receptor CD36, a key molecule for foam cell formation, in macrophage cells."
The results suggest that one way green tea may reduce one's risk of cardiovascular disease is that ECg may reduce macrophage-foam cell-related activity in the artery walls.
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 8-25-2008 |
Dr. Paul's Tea & Health Update |
#87b |
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CAN GREEN TEA REDUCE FREE IRON-CAUSED OXIDATIVE STRESS IN THE CIRCULATING BLOOD?
Free iron (unbound iron ions) is a frequent source of damaging free-radical formation in the circulating
blood. Previous studies suggest that green tea components such as EGCG work to reduce oxidative stress in the body by both
chelating with (absorbing) and scavenging (defusing) free iron ions in the circulating blood.
Note: ROS (reactive oxygen species, free radicals, oxidants) are potentially damaging, wayward energy packets and the
major source of oxidative stress.
Note: GTE (green tea extract).
Note: Lipid peroxidation is an expression of ROS-related damage.
Effect of green tea on iron status and oxidative stress in iron-loaded rats.
Med Chem. 2008 Jul;4(4):365-70. Ounjaijean S, et.al.
Click Here for PubMed Abstract of Study
This study, performed in rats, took place over a four month period. The study found that GTE:
"can decrease iron in plasma as well as eliminate lipid peroxidation in plasma, and destroy formation
of erythrocyte ROS in the rats challenged with iron."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 8-25-2008 |
Dr. Paul's Tea & Health Update |
#87c |
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WILL ALUMINIUM MIGRATE INTO THE TEA MARKETED IN ALUMINUM CANS?
Ready-to-drink tea is increasingly being marketed in aluminum cans. For example, iced tea and green tea
concentrate are marketed this way by several companies. The following study investigates whether or not the aluminum in
cans gets into the tea.
Note: Most aluminum cans are lined with plastic which separates the contents of the can from the aluminum container...unless
the can is damaged (dented). This plastic liner can be damaged when the aluminum can is damaged (dented).
Aluminium migration into beverages: Are dented cans safe?
Sci Total Environ. 2008 Jul 29. Verissimo MI, Gomes MT.
Click Here for PubMed Abstract of Study
The study investigated the migration rate of aluminum from cans to tea and beer. It compared
the aluminum content in these beverages after seven months of storage in undamaged and in dented cans. The
investigation found that aluminum increased:
"0.14 mg L(-1) in beer, and 0.6 mg L(-1) in tea."
The study also found that aluminum:
"concentration in dented canned tea increased 9.6 mg L(-1) in seven months."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-01-2008 |
Dr. Paul's Tea & Health Update |
#88a |
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WILL GREEN TEA REDUCE LDL OXIDABILITY AND IMPROVE VASCULAR FUNCTION IN WOMEN?
A recent study (See #86c) suggests that green tea may be protective against cardiovascular disease especially
in women. The following study examines two possible ways green tea may be protective: reducing LDL cholesterol oxidation levels
in the circulating blood and improving blood flow (vascular function).
Green tea reduces LDL oxidability and improves vascular function.
J Am Coll Nutr. 2008 Apr;27(2):209-13. Tinahones FJ, et.al.
Click Here for PubMed Abstract of Study
This study conducted in women found that:
"consumption of green tea extract by women for five weeks produced modifications in vascular function
and an important decrease in serum oxidizability."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-01-2008 |
Dr. Paul's Tea & Health Update |
#88b |
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WILL GREEN TEA MANUFACTURED FROM MATURE LEAVES CONTAIN MORE EGCG THAN TEA MANUFACTURED FROM YOUNG LEAVES? HOW MUCH EGCG IS IN PARTIALLY FERMENTED TEA?
Numerous research studies suggest that EGCG (of green tea) is protective against a variety of human
diseases. The following study compares EGCG content in various green and partially fermented (oolong) teas.
New Phenolic Components and Chromatographic Profiles of Green and Fermented Teas.
J Agric Food Chem. 2008 Aug 8. Lin LZ, et.al.
Click Here for PubMed Abstract of Study
The study found that EGCG is:
"the major phenolic component of green tea made from mature leaveswhile green tea made from the
younger buds and leavescontained lower flavonoid concentrations."
The study also found that:
"Partially fermented teascontained one-half the EGCG content of the green tea."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-01-2008 |
Dr. Paul's Tea & Health Update |
#88c |
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IS GREEN TEA PROTECTIVE AGAINST CARDIOVASCULAR DISEASE?
The following is a review study.
Green tea catechins and cardiovascular health: an update.
Curr Med Chem. 2008;15(18):1840-50. Babu PV, Liu D.
Click Here for PubMed Abstract of Study
This study recognizes numerous scientific studies suggesting that green tea catechins may be protective
against cardiovascular disease in six possible ways. Catechins may:
"present antioxidant activity"
"reduce intestinal lipid absorption"
"regulate vascular tone"
"prevent vascular inflammation"
"inhibit proliferation of vascular smooth muscle cells"
"suppress platelet adhesion"
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-08-2008 |
Dr. Paul's Tea & Health Update |
#89a |
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WILL OOLONG TEA CONTAIN AS MUCH EGCG AS GREEN TEA?
A previous study (88b) suggested that partially fermented (oxidized) tea (e.g., oolong) is likely to contain
half of the EGCG as unfermented tea (e.g. green). Nevertheless, fermentation level is highly variable in oolong teas. Also,
many oolong teas (typically called "old oolong teas") are heated (roasted) as part of the flavor enhancement manufacturing
process. Oolong teas not heated or roasted are often called "young oolong teas." The following study examines the changes
that take place in oolong tea compounds that take place during these intense heating processes.
Massive Accumulation of Gallic Acid and Unique Occurrence of Myricetin, Quercetin, and Kaempferol in Preparing Old Oolong Tea.
J Agric Food Chem. 2008 Aug 16. Lee VS, et.al.
Click Here for PubMed Abstract of Study
One of the findings of this study was that there was:
"significant lower (-)-epigallocatechin gallate (EGCG) but higher gallic acid contentsdetected in the old teas compared to the new one."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-08-2008 |
Dr. Paul's Tea & Health Update |
#89b |
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WILL MATE TEA PROTECT UNSATURATED FATTY ACIDS FROM OXIDATION?
Mate tea (unlike green, oolong and black teas) is manufactured from the Ilex paraguariensis plant rather
than the Camellia plant. Mate is a very popular tea grown and consumed throughout South America (and Central America). Several
preceding studies have suggested that mate tea, similar to green tea, contains a number of effective antioxidant compounds. The
following study adds to these previous studies.
Consumption of mate tea (Ilex paraguariensis) decreases the oxidation of unsaturated fatty acids in mouse liver.
Br J Nutr. 2008 Aug 19;:1-6. Martins F, et.al.
Click Here for PubMed Abstract of Study
This study examined the possible antioxidant qualities of mate polyphenols in the bloodstreams of mice. It
concludes that mate tea helps protect:
"unsaturated fatty acids from oxidation and may have selective protective effects within the body, especially on the liver."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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| 9-08-2008 |
Dr. Paul's Tea & Health Update |
#89c |
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WILL EGCG OF GREEN TEA HELP INHIBIT BREAST CANCER CELL GROWTH?
The expression of p27Kip1 is receiving increased research interest as a target gene related to breast
cancer. Instability of p27Kip1 is associated with increased breast cancer growth activity. Ideally, any agent that
stabilizes p27Kip1 activity will be protective against many common estrogen-sensitive forms of breast cancer.
Epigallocatechin gallate (EGCG) stabilizes p27kip1 in estrogen- stimulated MCF-7 cells through downregulation of the Skp2 protein.
Endocrinology. 2008 Aug 21. Huang HC, et.al.
Click Here for PubMed Abstract of Study
This study examined the possible mechanism whereby EGCG may inhibit the growth of estrogen-stimulated
breast cancer cells (MCF-7) in the laboratory. It found that EGCG stabilizes p27kip1 in estrogen- stimulated MCF-7 cells
through downregulation of the Skp2 protein. The study concludes that:
"therapeutic strategies designed to reduce Skp2 may...play an important clinical role in treatment of breast cancer cells."
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Ask your tea professional to guide you toward enjoyable tea options.
Ask your health professional to guide you toward viable health options.
Dr. Paul's Tea & Health Update, WWW.DRPAULSUPDATES.ORG, supports tea and
health educational programs by bringing recent research studies into public
awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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