Oh, foods that an ot offers for nervous system calming are often chewy foods---- beef jerkey, licorice, fruit roll up, those types of things. The chewing action slows the nervous system. Gum as well (why you see many adults that chew gum regularly).
My son has eating issues due to his sensory integration disorder. He does something called 'stuffing' which is putting tons of food in his mouth at once. Choking hazard (not to meniton ill mannered). He's looking for the oral impact of chomping down on this food which is a nervous system impulse. We've done ot and it is much better. I would buy him some thick bubble gum and offer him pieces here and there.
The hiding of food----------- is it just like a treat or like a sandwich? I ask this because my boys will both want to put a bag of skiddles they didn't finish in their special spot in their room. But if they were taking lunch up there, that would be different.
Did he go through any difficult times when younger? Sometimes kids with stabiliity issues will hide food. good luck
A really heathy diet is always a good idea. If all you have in the house is heathy food it won't matter what or when he eats it. Let him eat it anytime. put apples on his bed stand, etc.
I'm not exactly sure what you have been reading or what your son's problems are - but the book I recommend alot on this forum is Susan Ashley's, The ad & adhd Answer Book - found here http://www.amazon.com/ADD-ADHD-Answer-Book-Professional/dp/140220549X
You will find it covers a lot of very common ground. Please feel free to post if you have any specific questions.
i am glad to know he has an appetite. from what your telling me he seems like a healthy eater. i had ferocious eating habbits in times of being malnourished. my ways of coping were not the best in that time, but now after years of questions i found performance enhancing nutrition, and it can be found at a farmers market.every individual has a hunger for molecular equality. certain foods are the only way for equal nutrition to nourish the organs at any given point of an individuals growth.