Extra-high amounts of sodium can be hidden in savory snacks like popcorn served at movie theaters and other concession stands. Scott Olson/Getty Images hide caption

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That black triangle icon is a sodium warning label next to a dish on the menu at an Applebee's in New York City. Starting Tuesday, the city's Health Department is requiring chain restaurants with 15 or more locations to display the salt shaker icon next to menu items containing 2,300 mg or more of sodium — the recommended daily limit. Jewel Samad/AFP/Getty Images hide caption

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Steaks on the grill at the Mercado del Puerto in Montevideo. So far there are no figures that show if the table salt ban, which was enacted a few years ago, is actually making a difference in Uruguayans' health. Travel Aficionado/Flickr hide caption

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The salty suspects: Some 70 percent of the cheeses, soups, cold cuts and pizzas we buy at the grocery store exceed the Food and Drug Administration's "healthy" labeling standards for salt. Since we eat so much bread, it is — perhaps surprisingly — the top contributor of sodium to our diets. iStockphoto; Deborah Austin/Flickr; Beckman's Bakery/Flickr; iStockphoto; The Pizza Review/Flickr hide caption

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Consuming anywhere from about 2,600 milligrams up to almost 5,000 milligrams of sodium per day is associated with more favorable health outcomes, according to a study. iStockphoto hide caption

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Philadelphia is training owners of Chinese takeout restaurants to cut some of the salt in menu items like lo mein. Stephen Flood/Express-Times/Landov hide caption

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Eat less salt, but not too much less. iStockPhoto.com hide caption

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Nutrition fact labels are good but confusing, consumers say. iStockphoto.com hide caption

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Prepacked foods marketed for toddlers can have extremely high levels of sodium compared to the 1,500-milligram daily limit recommended by the American Heart Association Daniel M.N. Turner/NPR hide caption

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