Is tea being over-hyped for its health benefits?

After water, tea is the most popular drink in the world. And for good reason: It cools you when you're hot and warms you up when you're cold. And unless you add sugar, no need to worry about calories.

When it comes to tea, there's a lot of hype about its healing powers.

"There's no question there's stuff in tea that interacts with our bodies, the question is, how healthful is that?" said Dr. John Swartzberg, head of the editorial board at the UC Berkeley Wellness Letter.

For this month's cover story, the Wellness Letter analyzed the latest research on tea and concluded that there is no solid proof it can prevent heart disease, cancer, or any other condition on its own.

"I think you should drink tea not necessarily for its health benefits. I would drink tea because you enjoy it," Dr. Swartzberg said.

It can really help you diet if you use it to replace a high-calorie beverage

So what about green tea supplements? Dr. Swartzberg's advice is to skip them.

"There's no evidence that these are superior to drinking tea," he said. "As a matter of fact, there's no evidence that they're healthful at all."

Green tea supplements marketed for weight loss may contain very high doses of caffeine.

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