Chain restaurants around the city will have to start highlighting meals that are high in salt this week.
Starting Tuesday, they will be required to put an image of a salt shaker next to menu items that have more than 2,300 milligrams of sodium.
That's about a teaspoon of salt.
Health officials say the average American consumes about 3,400 milligrams of salt per day, which raises the risk of high blood pressure and heart problems.
Some restaurateurs say the city shouldn't be creating its own salt warning plan when federal regulators are working on new, national sodium guidelines.
The city won't start collecting fines until March 1.