"A new sodium warning requirement goes into effect in New York City restaurants Tuesday: Diners who eat at chain restaurants will now see warnings on menus next to items that contain high levels of salt."

"From now on, the New York City Health Department says chain restaurants with 15 or more locations must display a salt shaker icon next to menu items or combo meals that contain 2,300 milligrams of sodium or more."

"That's the recommended daily limit for sodium, but most Americans consume far more. And top contributors are foods we tend to eat when we're dining out, including pizza and deli sandwiches."

"In fact, surprisingly, they're among the six most popular foods that add unexpectedly high levels of sodium to our diet, according to the American Heart Association. Store-bought bread – which many of us eat several times a day — is another big offender."