LOS ANGELES (AP) — Many of the students at Kingsley Elementary School in a low-income neighborhood of Los Angeles eat breakfast and lunch provided by the school. For the nearly 100 enrolled in the after-school program, another meal is served: supper. The nation’s second largest school district is doubling the number of students served dinner, with an eye toward eventually offering it at every school. It’s a growing trend: Nationwide, the number of students served dinner or an after-school snack soared to nearly 1 million last year. “When kids are hungry, they don’t pay attention,” said Bennett Kayser, a member...