In 2015, the city of San Francisco enacted an ordinance that required health warnings on advertisements for certain sugar-sweetened beverages (SSBs) that read: “WARNING: Drinking beverages with added sugar(s) contributes to obesity, diabetes, and tooth decay. This is a message from the City and County of San Francisco.” The message was to be included on any billboard, poster, vehicle, or similar public medium that advertised an SSB. The city’s stated purpose for requiring the warning was “to inform the public of the presence of added sugars and thus promote informed consumer choice that may result in reduced caloric intake and improved diet and health, thereby reducing illnesses to which SSBs contribute and associated economic burdens.” The American Beverage Association, a trade association representing SSB producers, sued the city to prevent the implementation of the ordinance. On what grounds did the plaintiffs sue? How did the court rule?