Clean Energy Sourced from Green Tea.
Hebeda and Henry F. Zobel Mittal Nonthermal Preservation of Foods, Gustavo V. Pothakamury, Enrique Palou, and Barry G. Applied Dairy Microbiology, edited by Elmer H. Marth and James L. Steele Walter Akoh and David B. Min Walstra, T. Geurts, A. Noomen, A. Jellema, and M. Handbook of Food Preservation, edited by M. Shafiur Rahman Haard and Benjamin K.
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Hui, Sue Ghazala, Dee M. Graham, K. Maroulis and George D. Saravacos Copyright by Marcel Dekker, Inc. Foreword What you eat and drink can be the cause of a disabling or deadly disease, or it can extend your life span to a healthy old age.
In the United States, and many other countries, investments have been made in medical research that have led to major successes in disease prevention, diagnosis, and therapy. Advances in the basic sciences such as nutrition, biochemistry, pharmacology, and pathology have provided an understanding of cell and tissue behavior and factors that impinge on their proper functioning, as well as the elements that go wrong and lead to disease processes. Many of these diseases have been found to be associated with nutritional traditions, eating habits, and life-style.
For Copyright by Marcel Dekker, Inc.
Smokers also have a higher risk of emphysema. Tobacco chewing or snuff dipping leads to cancer of the mouth and esophagus. Excessive alcohol use potentiates the effect of tobacco, and by itself causes cancer of the esophagus and rectum, as well as diseases of the liver, including cirrhosis.
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It may also increase the risk of breast cancer. There are considerable international efforts to control the use of tobacco, especially of cigarette smoking. Tobacco farming and taxes on tobacco provide revenues to governments, but this income is small compared to the high cost of diagnosing and treating the disease associated with tobacco use. On the other hand, some foods and beverages have a protective effect. This statement is based on national and, especially, on international differences in disease incidence as a function of locally prevailing nutritional habits.
At the present time, coronary heart disease is a major problem in much of the West, but cerebrovascular diseases and stroke occur frequently in Asia and, in particular, in Japan and parts of China. People in the Western world suffer from cancer of the breast, colon, prostate, ovary, and endometrium uterus , whereas in the Far East these cancers have a low incidence, but cancer of the stomach and esophagus are major problems. In Africa, there are areas with endemic cancer of the liver, and in Egypt and other countries bordering the Nile River, cancer of the urinary bladder is frequent. International, coordinated research has provided leads or, in many instances, factual information on the causes of these major diseases as a sound basis for recommendations for prevention through avoidance of these causes.
Green Tea. Health Benefits and Applications | Cancer | Polyphenol
Smoking and tobacco use have already been cited as risk factors for certain diseases; it is also known that populations with a high sodium intake have a risk of stroke and gastric cancer. Populations with a high total fat intake have a risk of nutritionally linked cancers, such as those in the colon, breast, and prostate. Yet, Copyright by Marcel Dekker, Inc. Olive oil and canola oil do not increase the risk of the nutritionally linked cancers and of heart disease.
There is a lower incidence of heart disease and the nutritionally linked cancers in the Mediterranean region, in particular in Greece and southern Italy, where olive oil is favored. This high caloric value needs to be taken into account to avoid obesity, a major problem in North America.
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Obesity stems from excessive caloric intake over calorie needs for the normal functioning of the body. Populations of industrialized nations tend to be more and more sedentary, with the consequent lower caloric requirement. Wholesome drinking water supplies are also important.
Regrettably, in some areas of the world, water is contaminated by bacteria and undesirable chemicals. One solution to avoid bacterial contamination is to boil the water before use. The introduction of the wholesome and tasty beverage of tea thousands of years ago has provided a universal solution to the problem of providing humanity with a safe beverage. First, adults should consume about 2—2.
About one-third—— ml—might be in the form of hot or cold tea. In the Orient, green tea is favored, but in most of the Western world, black tea is the beverage of choice. Tea comes from the top leaves of the plant Camellia sinensis.
These leaves contain as principal product a powerful antioxidant, epigallocatechin gallate EGCg , and minor amounts of other catechins. All these chemicals are polyphenols. The fresh leaves also contain an enzyme, polyphenol oxidase. When the freshly collected leaves are treated with steam or heated in a pan, the polyphenol oxidase is inactivated. Drying of the heated leaves followed by chopping and rolling yields Copyright by Marcel Dekker, Inc. For example, they decrease the oxidation of LDLcholesterol, a risk factor for coronary heart disease.
The antioxidants also reduce the oxidation of DNA, consequent to the action of carcinogens and to the peroxidation reactions on lipids, generating oxy radicals and peroxides. In addition, they can induce enzymes in tissues such as liver that help detoxify harmful chemicals, including carcinogens, and lower the risk of promoting chemicals in the overall cancer process. Tea polyphenols also decrease the rate of cell duplication, especially of abnormal, transformed cells involved in cancer development.
Clearly, tea is an inexpensive beverage, that is easily made, hot or cold, and pleasant and tasty. It can be consumed neat or with a little milk, sugar, or lemon. It is sterile regardless of the quality of water used, since boiling is the customary way of preparing it. Yet, a single overview of the many aspects of tea production, its inherent properties and constituents, analysis, chemical and biochemical functions, actions in lowering risk of cardiovascular diseases and cancers, and the relevant underlying mechanisms Copyright by Marcel Dekker, Inc. We owe a debt to Dr. In addition, his discussion of their practical utility is sure to be of interest not only to those in tea and health sectors but also in other diverse industries where possibilities for utilizing tea catechins exist.
John H. Weisburger, Ph. Preface The importance of research on tea and health has been well recognized worldwide since around , and several international symposiums in succession have been held on this theme. Those interested in the physiological aspects of tea were invited to this symposium, and I had the privilege to attend it. Tea polyphenols, via oral intake or topical application, work miraculously in maintaining good Copyright by Marcel Dekker, Inc.
Tea is a refreshing, thirst-quenching beverage. In , the late Dr.
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Isuneo Kada of the National Institute of Genetics in Japan found that, among hundreds of herbal or vegetable extracts, green tea extract showed potent bioantimutagenic effects on the spontaneous mutations of a mutator strain of Bacillus subtilis NIG This fact implied that the spontaneous mutations of DNA might be inhibited by drinking green tea and accordingly might prevent the carcinogenesis of human cells. I lost no time in visiting Dr.
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