Lowering the chances of heart diseases is also one of the benefits of drinking green tea. According to the “Book of Tea written by Zen priest Eisai in 1191, describes how drinking green tea can have a positive effect on the five vital organs, especially the heart. The book discusses tea’s medicinal qualities which include easing the effects of alcohol, acting as a stimulant, curing blotchiness, quenching thirst, eliminating indigestion, curing beriberi disease, preventing fatigue, and improving urinary and brain function.” (Green Tea Health Benefits) The Zen priest believes that all of these things are good because green tea reduces the risks that will infect the five vital organs. Heart diseases are very common for people who are fat, somewhere around old age, and for skinny people. For example, a heart attack is one of an example of a heart disease. Heart attack usually occurs when a blood clot is in the coronary artery.