Just a quick note from my experience. I remember in early high school I started hiding food, specifically my school lunch! It wasn't that I didn't want to eat, it was more that I was sick of my sandwiches and fruit. If I brought it home I got in trouble for wasting food. If I was caught throwing out my lunch at school I'd get in trouble from the teachers. In the end is bring it home and hide it in my room. When I had the chance (and no one was around) id sneak it outside and put it at the bottom of the compost heap. It was a awful lot of trouble. Mum found it once and told me just to bin it if I didn't want it. I think she also let me start to pack my own lunch. It stopped then for some reason....