More ignore the not eating rather than the hiding. Don't get angry at hiding but say you don't have to hide it if you don't want to eat it leave it there. And keep reinforcing that as it may take awhile to change that behaviour.
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....
Thanks Chody, I remember doing similar but I think with DS1 it's gone beyond that point. He has made his own lunch since prep, he has a choice of sandwiches, wraps, salads, etc but he will only eat cheese sandwiches, will only take an apple and a yoghurt. He doesn't like kids yoghurt so we get the adult ones in a big tub, he is in control of how much he takes, which fruits (and we have a lot of options). But he has limited himself to just a few options and half the time he doesn't want to eat even them so he is left with nothing.
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