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

itoggle caption Stephen Flood/Express-Times/Landov

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

itoggle caption iStockPhoto.com

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

itoggle caption iStockphoto.com

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

itoggle caption Daniel M.N. Turner/NPR