Black tea can help gastrointestinal digestion, promote appetite, diuretic, eliminate edema and strong heart function. Disease prevention: strong antibacterial tea, gargle with black tea can prevent viral cause colds, and prevent tooth decay and food poisoning, lower blood glucose levels and blood pressure. American Heart Association has come to tea was "rich can eliminate free radicals, with the role of acid-fast flavonoids beverages, enabling reduction in the incidence of myocardial infarction" conclusion.