My son likes one thing at a time!
He can be into one computer game for a while, but then don't buy him anymore, because he might be off them for many years. Same thing with the food. When he was a little boy, he was talking about dinosaurs for month at a time,until he knew everything on the subject, then it was something else, and something else. When he is into something, he refuses to talk, breath about anything else. Now, as a teenager, it is worse!

