NEW YORK (AP) — Salt has quietly been slipping out of dozens of the most familiar foods in brand-name America, from Butterball turkeys to Uncle Ben's flavored rice dishes to Goya canned beans.

A Kraft American cheese single has 18 percent less salt than it did three years ago. The salt in a dollop of Ragu Old World Style pasta sauce is down by 20 percent. A handful of honey Teddy Grahams has 33 percent less salt. A squirt of Heinz ketchup is 15 percent less salty.

Their manufacturers are among 21 companies that have met targets so far in a voluntary, New York City-led effort to get food manufacturers and restaurateurs to lighten up on salt to improve Americans' heart health, Mayor Michael Bloomberg announced Monday. While it's unclear whether consumers have noticed the changes, campaigns aim to get more salt out of the national diet in the coming years — a challenge for an ingredient that plays a role in the taste, preservation and even texture of food.