Green tea's ability to fight cancer is even more potent and varied than scientists suspected, research suggests.
Scientists already know that green tea contains anti-oxidants which may have a protective effect against cancer.
But now they have discovered that chemicals in the tea also shut down a key molecule which can play a significant role in the development of cancer.
The molecule, known as the aryl hydrocarbon (AH) receptor, has the ability to activate genes - but not always in a positive way.
Tobacco smoke and dioxins, in particular, disrupt the functioning of the molecule and cause it to trigger potentially harmful gene activity.
The researchers, from Rochester University, found that two chemicals in green tea inhibit AH activity.
Source: BBC News