By JENNIFER PELTZNEW YORK (AP) â¿¿ 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 â¿¿ a challenge for an ingredient that plays a role in the taste, preservation and even texture of food. Salt reduction has become a recent focus of public health campaigns in the city and elsewhere. Salt, or sodium chloride, is the main source of sodium for most people. Sodium increases the risk of high blood pressure, a major cause of heart disease and stroke. Dietary guidelines recommend no more than 2,300 milligrams of sodium a day, equal to about a teaspoon of salt; the American Heart Association suggests 1,500 milligrams or less. But average sodium consumption in the U.S. is around 3,300 milligrams, the federal Centers for Disease Control and Prevention have found. Officials said the first step was a meaningful one. "The products they're making healthier are some of America's most beloved and iconic foods," noted Bloomberg, a fan of Subway's meaty Italian BMT sandwiches, which are now 27 percent less salty.