Drinking green tea can substantially cut the risk of dying from a range of illnesses, a Japanese study has found.

The research, which looked at over 40,000 people, found the risk of fatal cardiovascular disease was cut by more than a quarter.

But British heart experts said the benefits may be linked to the whole Japanese diet, which is healthier than that eaten in the west.

In this study, which began in 1994, researchers from Tohoku University looked at how humans could benefit.

They examined data on 40,530 healthy adults aged 40 to 79 in north-eastern Japan, where green tea is widely consumed.

Around 80% of people in the region drink green tea, with more than half consuming three or more cups each day.