This study explores the impact of new social media regulations in Louisiana and Texas designed to limit adolescents' exposure to junk food advertising online. Using a difference-in-differences approach, it compares ad exposure among 700 diverse teens annually over five years, including those from lower-income and minority backgrounds. The research assesses whether policies requiring parental consent or restricting targeted ads reduce young people’s contact with unhealthy food promotions. It also examines how these policies affect health disparities and evaluates qualitative insights from teens and parents. This protocol aims to inform future policy decisions in regulating youth-directed digital marketing.