We had to set a toutinr for computer games.
We made a checklist of what needed to be doen before he was allowed to have a turn - Homework, music practice, exercise tyoing practise etc.
When he has done all that he is allowed one half hour turn a day.
If he wants a longer turn, he needs to earn his turn, but not have it and "bank" it for another day.
We use an elctronic timer for the timing as he doesn't say it's just us "being mean" when his turn is over.
We broiught this in when he was 9. It took us 3 months of absolute hell for him to get used to it, but for the last 2 1/2 years have been easier.
My boy has the not eating problems too sometimes. even though I don't try to force him to eat stuff he "can't". Somedays he just won't eat and then I have major issues with behaviour because of low blood sugar.
For this I have explained to him that we are at very high risk of diabetes (we are) and that we need to eat regularly even if we are not hungry. Sometimes he will only drink a choc milk, but it is a food and it helps him get his sugars under control again.
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You don't have to be crazy to be here, but it helps.