Calorie warnings on fast-food menus are junk.

Most New York City kids from low-income neighborhoods ignore them, according to a new study on child obesity by NYU School of Medicine.

Both before and after mandatory labeling began, the NYU team gathered receipts from 427 teenagers and parents at four of the biggest chains.

Of the 349 kids from the South Bronx, central Brooklyn and Harlem who were quizzed, only 9 percent said the signs made any difference.