Drinking four or more cups of tea every day could be more beneficial than drinking water, scientists have revealed.

They say that tea not only rehydrates you as well as water does, but it can also offer protection against heart disease and cancer.

It is commonly thought that drinking tea leads to loss of fluid and may lead to dehydration. But according to researchers, the water in the tea can actually help replenish fluids in the body.

The researchers say their findings could benefit older members of the population, many of whom do not drink much water.

Previous research has shown that drinking three cups of tea a day can cut the risk of having a heart attack by 11 per cent. It has also been shown to stave off some forms of cancer, including colorectal cancer.

Other health benefits include reducing tooth decay and possibly improving bone strength. Some studies suggest the caffeine in tea can also help concentration and improve one's mood.

The key component is a group of antioxidants called flavonoids - a major component of tea, which help prevent cell damage.

Researcher Dr Carrie Ruxton, a public health nutritionist, said that most Britons drink just under three cups of tea a day below the 'good health' threshold.

"Many people wrongly think that drinking tea will make you lose fluid and become more thirsty, but this is a myth. Tea is in fact rehydrating, not dehydrating,” Dr Ruxton was quoted by The Daily Mail, as saying.

"Add to this the overwhelming evidence that drinking tea every day can be beneficial to heart health, and you could argue that drinking tea is actually better for you than drinking water.

"Our bodies need antioxidants to help fight off the attack by free radicals and tea provides the most abundant source in the UK diet. You don't find these antioxidants in water alone.

We should also consider the positive benefits that drinking tea has on hydrating Britons - many of whom are elderly and don't drink water," she added.