Administration of polyphenolic extracts of green tea in combination with known carcinogens resulted in decreased incidences of skin tumours in mice

Depending on manufacturing techniques, te as can be divided into two main types: black tea, which has undergone an enzymic oxidation called 'fermentation' during processing, and green tea, which has not. Black tea represents about 80% of world production. Annual tea consumption varies from country ta country, ranging from a high level of about 3 kg per capu! ta negligible values in many countries. World consumption is approximately 0.5 kg per caput. Green tea is the primary form consumed in China, Japan and some Middle Eastern countries. Instant tea and decaffeinated tea consumption is small, but the latter is becoming more significant in the USA.