You probably noticed the menu at your favorite chain or fast-food restaurant now contains calorie information. Now, New York City is taking full disclosure one step further. By March 1, 2016, many restaurant menus will have a salt shaker icon next to items that contain more than 2,300 milligrams of sodium, the USDA's recommended daily limit — that's daily, not per meal — for healthy adults who don't have high blood pressure. The American Heart Association recommends a daily sodium limit of 1,500 milligrams a day.

One teaspoon of salt contains 2,300 milligrams of sodium.

The new rule applies to restaurants with 15 or more locations nationwide, as well as some ballparks and movie theaters. It’s the first of its kind in the United States, the New York Times reports.

Consuming too much sodium is thought to contribute to high blood pressure, which in turn increases the risk of heart disease and stroke.

“Americans are far exceeding their daily recommended sodium intake, and chain restaurants are a large factor, health experts say, with the average person consuming about 3,300 milligrams a day,” the New York Times reports.

When it comes to sodium, the biggest enemy isn’t the salt shaker on your table at home, the American Heart Association says. Nearly 75 percent of the sodium we take in comes from the salt added to processed foods and restaurant foods. And when you don’t know how much salt is in your food, it’s hard to limit the amount you consume.

The infographic below shows six popular foods that typically pack a sodium wallop. Next time you order up that deep dish pepperoni pizza or Italian sub sandwich, make sure you’re not biting off more sodium than you can safely chew.

Infographic from the American Heart AssociationInfographic from the American Heart Association (Photo: American Heart Association)