Serving water with school lunches makes children less likely to become obese, according to new research.
A five-year pilot study in 1,200 elementary and middle schools in New York City found that placing water dispensers in cafeterias is more successful than ensuring healthy food is sold during lunch.
Expanding the program nationwide could prevent more than half a million children in the US from piling on the pounds.
The percentage of children with obesity in the US has more than tripled since the 1970s. Today, about one in five school-aged children is obese.