Tea and Health Benefits

http://www.ncbi.nlm.nih.gov/pubmed/23448443

Tea, next to water is the cheapest beverage humans consume. Drinking the beverage tea has been considered a health promoting habit since ancient times. The modern medicinal research is providing a scientific basis for this belief.

http://en.wikipedia.org/wiki/Health_effects_of_tea
This article addresses effects only of tea made from the plant Camellia sinensis, including black tea, oolong tea, green tea, and white tea. It does not address effects of other plant infusions that might be called "tea", including what are sometimes called "herbal tea".