Words fail except to wonder if he can see at all - his eyes aren't visible in any of the photos (and yes I'm allowing for the epicanthic folds of Asians).
I’ve seen a few shows on tv about children who have some disorder where they can’t feel full. They literally crave the food - more than any normal person craves something. It is easy for all of us to say lock up the food or don’t feed him, but I think this child probably has some sort of disorder - this is horrible.