Evidence about green tea and cancer

Some laboratory studies have shown that extracts from green tea can stop cancer cells from growing. Green tea contains substances called polyphenols, which scientists think give it antioxidantproperties. But while these lab results are encouraging, we need evidence from human studies to prove them.

The evidence we have at the moment from human studies is mixed. A meta-analysis published in 2006 suggested that green tea may lower the risk of breast cancer. But an earlier meta-analysis could not find any significant evidence to support a reduction in risk of breast cancer.

Other studies are also conflicting. A meta analysis in 2006 concluded there was not