Table S1. Description of hot and cold entrees served at each of the three high schools enrolled in the study (x indicates availability at the school).
Hot and cold entrée food descriptions	Healthy Choices School	Healthy Nudging School	Comparison School	
Bologna and cheese sandwich	x	x	x	
Chicken Caesar salad	x	x	x	
Chicken 	x	x	x	
Chicken salad sandwich	x	x	x	
Egg salad sandwich	x	x	x	
Ham and cheese sandwich	x	x	x	
Ham salad sandwich	x	x	x	
Peanut butter and jelly sandwich	x	x	x	
Deli sandwich	x	x	x	
Tuna salad sandwich	x	x	x	
Turkey and cheese sandwich	x	x	x	
Turkey salad sandwich	x	x	x	
Vegetable sandwich	x	x	x	
Baked ziti 	x	x	x	
Sweet and sour boneless chicken	x	x	x	
Chicken (breaded, on the bone)	x	x	x	
Chicken nuggets	x	x	x	
Chicken parmesan patty	x	x	x	
Spicy chicken patty	x	x	x	
Chicken tempura with BBQ sauce		x	x	
Boneless chicken teriyaki	x			
Hot and spicy chicken tenders	x	x	x	
Fish	x	x	x	
Hamburger	x	x	x	
Hot dog	x	x	x	
Macaroni and cheese	x	x	x	
Macaroni and cheese with beef 	x	x	x	
Meatball grinder	x	x	x	
Pizza with cheese	x	x	x	
Pizza with meat			x	
Roast turkey	x	x	x	
Tacos	x	x	x	
BBQ shredded turkey	x	x	x	
Chicken and broccoli ziti	x	x	x	
Ziti with meatballs	x	x	x	
Ziti with meat sauce	x	x	x	
Deli wrap	x	x	x	

Table S2. Availability of competitive foods sold a la carte in each school enrolled in the study (x indicates availability at the school).
Competitive food description	Healthy Choices School	Healthy Nudging School	Comparison School	
Chicken nugget or tender snack-size	x	x	x	
Chips	x	x	x	
Minute maid juice	x	x	x	
Mozzarella sticks			x	
One baked cookie	x	x	x	
Popcorn chicken	x	x	x	
Hot sauce side	x	x	x	
Three baked cookies	x	x	x	
V8 fusion juice	x	x	x	
Bottled water	x	x	x	
Salad of the day	x	x	x