Green Tea Reduces All-Cause Mortality and also Reduces Heart Disease Mortality.
Cardiovascular disease refers to a class of diseases that involve the heart or blood vessels (arteries and veins). While the term technically refers to any disease that affects the cardiovascular system, it is usually referred to artherosclerosis (arterial disease). These conditions have similar causes, mechanisms, and treatments. In cardiovascular disease, taking a medical history, interview, and physical examination remain the most important parts of patient assessment. In practice, cardiovascular disease is treated by cardiologists, thoracic surgeons, vascular surgeons, neurologists and interventional radiologists, depending on the organ system that is being treated. Most patients are aware that cardiovascular disease remains the leading cause of death in the United States. There are many risk factors for cardiovascular disease. Three that cannot be changed are older age, male gender, and a family history of CVD. Additionally, three other major risk factors include cigarette smoking, high cholesterol and high blood pressure. Other identified factors associated with increased risk for cardiovascular disease include lack of exercise, diabetes, obesity, too much alcohol, increased homocysteine levels, certain infections and inflammation, estrogens, androgens, and certain psychosocial factors. The combination of multiple risk factors must also be considered.
Colorectal cancer, also called colon cancer or large bowel cancer or rectal cancer, includes cancerous growths in the colon, rectum and appendix. With 655,000 deaths worldwide per year, it is the third most common form of cancer and the second leading cause of cancer-related death in the Western world. In the United States, it is the fourth most common cancer in men and women. Caught early, it is often curable. It is more common in people over 50, and the risk increases with age. Everyone who is 50 or older should be screened for colorectal cancer. Colonoscopy is one method that your doctor can use to screen for colorectal cancer. Treatments for colorectal cancer include surgery, chemotherapy, radiation or a combination.
Green tea is an evergreen shrub that has long been used in much of the world as a popular beverage and a respected medicinal agent. An early Chinese Materia Medica lists green tea as an agent to promote digestion, improve mental faculties, decrease flatulence and regulate body temperature. The earliest known record of consumption is around 2700 B.C. Ceremonies, celebrations, relaxation time and ordinary meals usually consist of tea in most parts of the world, except the United States, where coffee has become the most popular beverage. Unlike black tea (also Camellia sinensis) which is produced by oxidizing the young tea leaves, green tea is produced from steaming fresh leaves at high temperatures, thereby inactivating the oxidizing enzymes and leaving the polyphenol content intact. Green tea is an antioxidant and is used in promoting cardiovascular health and reducing serum cholesterol levels in laboratory animals and humans. Studies suggest that green tea contains dietary factors that help decrease the development of some infectious diseases and dental caries. Green tea has diuretic, stimulant, astringent, antibacterial, antifungal, anticarcinogenic, thermogenic and anti-inflammatory properties. Green tea has also been reported to enhance immunity.
A study conducted in Japan investigated the association between green tea consumption and all-cause mortality, cancer and cardiovascular disease. The researchers analyzed 12,251 subjects aged 65 to 84 years by having the subjects complete questionnaires that included frequency of green tea consumption and were followed for up to 6 years. During the follow-up, 1,224 participants died, 400 were from cancer and 405 were from cardiovascular disease. People who drank seven or more cups of green tea a day experienced a 55 percent lower risk for all-cause mortality and a 75 percent lower risk for CVD mortality in comparison to people who drank less than one cup of green tea a day. Also, a reduction in the risk of colorectal cancer mortality of 31 percent was observed in subjects who drank seven or more cups of green tea a day in comparison to those who drank less than three cups a day. The researchers concluded by stating that the protective effects of green tea consumption could have significant implications for public health.1
1 Suzuki E, Yorifuji T, Takao S, et al. Green tea consumption and mortality among Japanese elderly people: the prospective Shizuoka elderly cohort. Ann Epidemiol. Oct2009;19(10):732-9.