In countries such as Japan where the consumption of green tea is very high, the incidence of cancer and heart disease is relatively low. The potent polyphenols in green tea have been shown to reduce the risk of several types of cancer particularly those affecting the esophagus, colon, pancreas and rectum.
In a study published by the Journal of Cardiology, participants who drank at least one cup of green tea per day were 42 percent less likely to suffer heart attacks than those that did not. Another study published by the International Journal of Cardiology, showed that patients who drank three or more cups of green tea per day had lower levels of harmful cholesterol, LDL.
Other studies show that drinking green tea helps to lower insulin resistance and prevents insulin-induced body fat accumulation.
This protection from cardiovascular disease occurs in several ways: compounds in green tea lower cholesterol and inhibit abnormal blood platelet clots, preventing thrombosis and decreasing blood pressure; the primary cause of heart attacks and strokes. They also help to balance weight gain and improve fat metabolism.
International Journal of Cardiology: Green tea consumption and risk of cardiovascular and ischemic related disease: A meta-analysis