Tea can be classified into three classes, namely, fermented or Black tea, unfermented or Green tea, de-fermented or Oolong tea. The stages and the manner of processing are common for all the three. First, the tender leaves are plucked and then heated for about 18-24 hours after which they are rolled down by machines which make them into small grains. They are then exposed to sun for about 30-40 minutes and then packed and sent for marketing.
Assam contributes 15.6% of world’s tea production and 55% of India’s tea output.
Green tea is made from unoxidized leaves and is one of the less processed types of tea. It therefore contains the most antioxidants and beneficial polyphenols.
Fast facts on green tea
Here are some key points about green tea. More detail and supporting information is in the main article.
- green tea has been used in traditional Indian and Chinese medicine
- there are many different types of green tea available
- green tea may help prevent a range of ailments including cancer
- more research is needed to prove many of the health claims surrounding green tea
Green tea and cancer prevention
According to the National Cancer Institute, the polyphenols in tea have been shown to decrease tumor growth in laboratory and animal studies and may protect against damage caused by ultraviolet UVB radiation.
Some studies have also shown the positive impacts of green tea on the following types of cancer:
- colorectal (bowel)
- esophageal (throat)