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Additional file 1 Supplemental Table 1. Details on the inclusion of participants for the focus group discussions.

Additional file 4: Supplementary Fig. 2. Scatterplots displaying plate waste per pupil and consumption per pupil in Schools 1 and 3.

Additional file 5: Supplementary Table 3. TIDieR Checklist for intervention components.

Additional file 2: Supplementary Table 2. Nutrient constraints applied during all linear optimization procedures.

Additional file 3: Supplementary Fig. 1. Questionnaire about satisfaction with school meals.

Additional file 1: Supplementary Table 1. Dishes in the four-week baseline and new menu plans, respectively. The second dish at baseline is always vegetarian while in the new menu the first dish is. The meals are served with a salad buffet, bread and butter or margarine.

Additional file 1: Table S1. List of foods and food groups along with examples and their numbers included into the optimization. Table S2. Amounts of single foods and their cost in the food basket for a family on minimum wage (MWFB) on a daily and monthly basis. RD, relative deviation from the reported intake of the corresponding category.