Some studies tout the myriad health benefits of adding olive oil to your diet, but research suggests that the majority of olive oil sold in the U.S. has degraded by the time it is consumed. "The most important thing for consumers to remember when they're purchasing extra-virgin olive oil is that is not wine. It does not get better with age. It's never better than the day it was produced," said Gregg Kelley of California Olive Ranch.

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