Have you watched any of Dr. Weiner's videos on YouTube? He's a bariatric surgeon who has a lot of great videos, but he said something about head hunger in one of his videos (can't remember which one now) that really bugged me. He basically said that "stomach growling" hunger feeling is just head hunger, and I was like, "B.S.!"
I am so thankful that my surgery has almost completely eliminated my hunger (so far... I know my hunger will probably return eventually). Before surgery, I felt like my stomach was a bottomless pit, and I could eat huge quantities of food and still be hungry. I tried waiting after I ate since we're always told it takes time for satiety to set in, and nope -- I would just keep getting hungrier. There were so many times that I didn't WANT to eat any more, but I was just so hungry. Sometimes I couldn't sleep because of hunger and I had to eat more just so I could sleep. And I am quite sure that this was real, physical hunger and not just in my head.
My personal theory is that this is one of the factors that makes it more difficult for some people to lose or manage their weight. I truly believe that some people are just hungrier than others, or maybe we feel hunger more strongly -- kind of like a pain threshold. People who don't have that extreme hunger can't understand why it's not as easy as it sounds to "just eat less."
Now, I will also admit to having head hunger -- eating out of boredom or habit, or because something looks delicious and I want to taste it, or I'm eating something so delicious that I want to keep eating more of it, or to treat myself to something I've been looking forward to eating -- and I still experience that sometimes. I still have times when I see something I want to eat really badly even though I know that I'm not hungry. But it is a heck of a lot easier to resist when I'm not actually, physically hungry.