Monday Dec 1, 2008 (foodconsumer.org) -- A new study
published in 2008 in Nutrition suggests that daily intake of green tea
(Camellia sinensis) extracts may lower blood pressure, cholesterol and
biomarkers of oxidative stress.
The randomized, double-blind, placebo-controlled study
showed taking green tea extract supplements for three weeks lowered systolic
and diastolic blood pressures by 5 and 4 mmHg respectively and reduced total
cholesterol by 10 mg/dL.
Previous studies have already suggested that intake of
green tea and its extracts may reduce risk of a variety of diseases including
cardiovascular disease, Alzheimer’s disease and some cancers.
Green tea contains highest amounts of water-extractable
polyphenols than black tea, 30-40 percent versus 3- 10 percent, according to
nutraingredients.com. Epigallocatechin gallate (EGCG), epigallocatechin (EGC),
epicatechin gallate (ECG), and epicatechin (EC) are the four major polyphenols
found in fresh tea leaves.
The study was conducted by Meri Nantz and colleagues from
the University of Florida, Brigham and Women’s Hospital and Harvard Medical
School, and the Nutritional Science Research Institute in Boston.
For the three-week study, 52 healthy men and 72 healthy
women ages 29 on average were assigned Cardio Guarda green tea extract
Suntheanine at a dose with 100 mg of L-theanine prepared by Taiyo International
and 200 mg of a decaffeinated catechin green tea extract Sunphenon 90DCF by the
At the end of the study, total and low density
lipoprotein cholesterol levels dropped 10 and 9 mg/dL respectively.
Malondialdehyde indicative of oxidative
stress and amyloid-alpha, a marker of chronic inflammation were also reduced by
12 and 42 percent respectively.
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