Given a public health goal to reduce childhood obesity, which single policy would most directly alter societal-level drivers rather than community- or individual-level factors?

• A. Distribute educational flyers about portion sizes at pediatric clinics without changing broader marketing or pricing structures
• B. Create after-school cooking clubs in specific neighborhoods to teach parents and kids meal preparation skills
• C. Offer discounts to families who enroll in local weight-management programs
• D. Implement a national regulation that restricts children-targeted advertising of energy-dense foods and requires front-of-package nutrition labeling to standardize information across the country

Answer: (D)