New York City ? Want 300-calorie fries with that?

The city Board of Health voted Tuesday to approve a new version of a law requiring fast-food outlets to display calorie counts on their menus, hoping the fat-filled truth will shock New Yorkers into eating healthier.

The regulation, which takes effect March 31, was altered slightly after a judge rejected the city’s first attempt last year.

The new regulation applies to any chain that operates at least 15 separate outlets, including those that don’t currently provide any information on calories. Major fast-food chains make up about 10 percent of the city’s restaurants.

Several chains, such as McDonald’s and Burger King, have the information available but don’t list it on their menu boards.