Good news for coffee lovers -- new research suggests coffee may help prevent depression in women.

In fact, it may lower the risk by as much as 20 percent.

Harvard researchers looked at data on more than 50,000 middle-aged women over a 10-year period. Those who drank the most caffeinated coffee -- about 4 to 5 cups a day -- were less likely to be diagnosed and treated for depression.

I've seen a number of women who are already depressed. Middle aged women who tell me that caffeine does more for them than any other of the medications around, says Dr. Michael McKee with the Cleveland Clinic.

But doctors say it's way too early to start prescribing coffee. Genetics and a number of lifestyle factors affect a person's risk for depression.

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