Background: Four-day school week (FDSW) use has increased substantially among US districts in recent years, but limited data exist on health impacts of this school schedule. This study examined associations of reduced school exposure via FDSWs with adolescent health and risk behaviors, obesity, and food security. Methods: Self-report data from…

Objective: "MyPlate," a tool for communicating the federal nutrition guidelines in the USA, may contribute to healthy diets and behaviours, yet whether and how it is used by teachers and school principals is unknown. The purpose of this study was to examine (1) the prevalence of using nutrition lessons and MyPlate guidelines by K-12…

Despite limited empirical evidence, there is growing concern that junk food availability in schools has contributed to the childhood obesity epidemic. In this paper, we estimate the effects of junk food availability on body mass index (BMI), obesity, and related outcomes among a national sample of fifth graders. Unlike previous studies, we address…