Table 1.

StayingFit intervention components.

Component	Description
Sessions	Each StayingFit session includes 10-15 pages of online content, written at a 9th grade reading level, designed to take approximately 30 minutes to complete.
Learning questions	At the end of each session, students are asked to answer questions about their learning that week. Questions assess knowledge, attitudes, behaviors, and self-efficacy related to specific skills taught in the session. To measure student engagement and enjoyment of the material, students rated the level at which content was helpful, interesting, and fun.
Food log	All students completed a food log, in which students indicated the number of separate servings of fruits, vegetables, other green foods (low fat, high nutrient foods), red foods (high fat, low nutrient foods), and soda they had on the day prior to completing the log. After students submitted the log, they were provided automated feedback related to goals (aligned with USDA guidelines) that they set in the first session of the program.
Meal size log	In the meal size log, students recorded meal times, sizes, and hunger before and after meals. Automated feedback was given based on number of meals and meal size, designed to encourage regular eating.
Physical activity log	Students are asked to record the type, frequency, and intensity of physical activity they completed over the previous week and set physical activity goals for the next week. Automated feedback about their exercise habits is provided.
Weight log (WM Track)	Students in the WM track may also complete a weight log, in which they recorded weekly weight and were provided cautionary feedback if they reported unhealthy weight loss or motivational feedback if they reported weight gain.
Hunger and fullness rating scale (Cohort 2)	A hunger/fullness scale ranging from 0 (starving/ravenous) to 10 (stuffed) was used to teach participants to be more attuned to their internal appetite cues. Participants were encouraged to monitor their hunger level throughout the day and to begin eating when their internal appetite signals reached a hunger level of 3, and to stop eating when they reached a 7.
Discussion board	All students were invited to comment on an anonymous discussion board, accessible 24 hrs a day, but primarily used during class to respond to questions related to program material.
Parent materials	Parents could receive weekly emailed or hardcopy newsletters that provided content coordinated with student sessions.
Teacher materials	Teachers were provided with “StayingFit Program FAQs” and invited to contact the research team with any questions.