1. How do green tea catechins prevent cancer?
Green tea extract prevents cancer by the following mechanisms:
 By neutralizing dietary carcinogens such as nitrosamine and aflatoxin.
 By interfering with binding of cancer causing agents to cellular DNA thereby protecting cells against mutations that can
  eventually cause cancer.
 By protecting against free radical DNA damage.
 By inhibiting bacterial-induced DNA mutations.
 By working with enzymes and other antioxidants in the intestine, liver and lungs to prevent activation of certain
  carcinogens before they damage the DNA.
 By protecting against the effects of ionizing radiation and uv radiation.

2. How do green tea catechins protect against cardiovascular disease?
Green tea appears to mitigate many risks associated with heart disease and strokes and it is known to lower LDL cholesterol and serum triglyceride levels. The antioxidant effect of green tea inhibits oxidation of LDL cholesterol in the arteries. Green tea is known to inhibit abnormal blood clot formation as effectively as aspirin while specifically inhibiting platelet aggregation and adhesion via effects that differ from those of aspirin. It also reduces risk of arterial blood clotting by two mechanisms - by inhibiting thromboxane A2 formation and, by inhibiting another clotting agent called platelet activating factor PAF. Reducing thromboxane A2 levels is highly desirable to protect against cardiovascular disease. Green tea is also known to elevate HDL cholesterol levels.

3. How does green tea lower blood pressure?
One of the reasons for high blood pressure could be loss of arterial elasticity due to aging. Another significant cause of hypertension is angiotension-converting enzyme (ACE), an enzyme secreted by the kidneys and blood pressure can be significantly reduced in most hypertensives by blocking ACE. Green tea is a natural ACE inhibitor. Studies show that animals and humans given green tea extracts have lowered blood pressure.

4. How does green tea reduce blood sugar levels?
Green tea inhibits enzyme amylase, which is used by the body to break down starch into simple sugars that can be absorbed by the blood stream.

Epidemiological studies shown that people who drink green tea have significantly lower risks of many diseases including cancer, heart disease and stroke. Sadzuka et al 1998, Weisberger JH, 1996.  Studies show that tea consumption lowers risk of osteo porosis. Fujita 1994, Kao and P'eng 1995.  Studies report protection against liver disease. Imai and Nakachi,1995.  Studies indicate that green tea lowers LDL and serum triglyceride levels and also elevate HDL levels.  One study has shown that Green tea extract reduces normal elevation of glucose and insulin when 50 grams of starch were ingested.  Another study has shown that one cup of green tea inhibited amylase activity by 87%.  Studies show that polyphenols most prevalent in green tea are more potent than vitamin C and E in suppressing free radicals.  A human study indicated that toxic compound methylguanidine decreased significantly one month after the administration of green tea polyphenols.