The law, which Gov. Gavin Newsom signed on Wednesday, sets a 10-year deadline for the change to take place.

A new law will make California the first state to phase some ultraprocessed food out of school meals.

Gov. Gavin Newsom signed legislation Wednesday that prohibits public schools from serving children what it describes as “ultraprocessed foods of concern” in breakfasts or lunches. The policy sets a 10-year deadline for the change to take place.

It defines such foods as those that pose the greatest risks to consumers based on scientific evidence of adverse health outcomes, and it directs the state Public Health Department to determine which particular products meet the definition by June 2028.