I have experienced on and off hunger since my surgery. I finally realized it happens because I was waiting too long between eating, so I was hungry. Make sure you develop a routine, set times to eat. Bring food with you so you can always have it at the designated time. I bring small tupperware containers of meats wherever I go. If you;re curious, here's my eating schedule:
7:00- eat 1/2 my Breakfast
10am- eat leftover breakfast
12:30pm- lunch
3:30pm- Protein based snack
7:00pm- dinner
Also, when I have the hunger pangs, I try to concentrate on drinking 16 ounces of Water (not all at once.)
I'm also pretty sure that my brain has not caught up with my stomach, and the hunger is an instant reaction to boredom, stress, etc.