Health effects of tea

Tea contains a large number of potentially bioactive chemicals, including flavinoids, amino acids, vitamins, caffeine and several polysaccharides, and a variety of health effects have been proposed and investigated.It has been suggested that green and black tea may protect against cancer, though the catechins found in green tea are thought to be more effective in preventing certain obesity-related cancers such as liver and colorectal while both green and black tea may protect against cardiovascular disease.
Numerous recent epidemiological studies have been conducted to investigate the effects of green tea consumption on the incidence of human cancers. These studies suggest significant protective effects of green tea against oral, pharyngeal, esophageal, prostate, digestive, urinary tract, pancreatic, bladder, skin, lung, colon, breast, and liver cancers, and lower risk for cancer metastasis and recurrence.