Fortified foods: How healthy are they?

"Nutritionally enhanced foods are essentially just a different way of getting some of the benefits of a vitamin supplement. Studies show both do the job," says Sheldon Hendler, M.D., Ph.D, co-author of "The Physician's Desk Reference for Nutritional Supplements."

But enhanced foods aren't always as impressive as the label may suggest --especially when compared to whole foods. "Processing destroys nutrients, and the more processing there is, the more destruction you get," says Marion Nestle, author and professor of nutrition, food studies and public health at New York University. "Fortification adds back some nutrients, so overall you're better off with a processed fortified food than a processed unfortified one. But a whole food is always going to be superior."