The New York City Board of Health voted unanimously Tuesday to require all city chain restaurants to post calorie data on their menus.
Some restaurants already make the calorie counts of menu items available, but beginning March 31 they will have to put the numbers on menu boards and menus.
The change will affect restaurants with 15 or more outlets -- roughly 10 percent of all city restaurants, according to a news release from the city's health department.
The Department of Health argued in October that "calorie information provided at the time of food selection would enable New Yorkers to make more informed, healthier choices."
