We worked for more than a school year trying to create lasting lifestyle changes. weekly we reviewed what had been of the exercise measures and how often the students and teachers had eaten unhealthy. Quite a few students were in the habit of eating chips and cakes and drinking soft drinks when they came home from school on weekdays. We had some good discussions about this and got it turned around - with a few relapses - that the students "only" resorted to these products on Fridays and Saturdays.
The year before, we were contacted by the German school m.h.p. To enter into a project together. We quickly agreed that the subject activities should revolve around healthy lifestyles. Including with a special focus on movement and diet.