Drinking three or more cups of tea a day is as good for you as drinking plenty of water -- and may be even better.
Research dispels the common belief that tea dehydrates. Tea not only rehydrates as well as water does, but it can also protect against heart disease and some cancers.
Rodale states that:
"As in previous studies, a strong link between the beverage and heart-protective qualities was established, most likely a result of the beneficial flavonoid activity in the tea.
The research suggests that drinking one to eight cups (cups, not gigantic mugs) a day is associated with a reduced risk of chronic disease."