When it comes to food, fresh doesn't always mean better.

The Food and Drug Administration announced Wednesday that certain canned or frozen fruits and vegetables are just as good as fresh produce, letting a list from canned beets to frozen green beans be advertised as "healthy."In fact, the FDA said, some frozen or canned vegetables may even be more nutritious than fresh ones because vitamins can leach out of fresh produce. One study said fresh green beans left for three days in the store and three days in a home refrigerator retained only 36 percent of their Vitamin C, while frozen green beans had twice as much.

FDA regulations now say fruits and vegetables can be labeled "healthy" if they are fresh or if they are low in fat, meet certain sodium and cholesterol limits and contain at least 10 percent of the daily requirement of Vitamin A, Vitamin C, calcium, iron, protein or fiber.