For me, hunger has gotten disconnected from needing to eat. When I get past time to eat, it becomes really hard to force food into me. The signals I watch for are irritability, shakiness, dizzy, weak, tired, frustrated. Life just becomes harder. At times like this I will eat whatever I can even if it isn't good for me, (McDonald's hamburgers for example). It gets something into me and allows me to eat real food. Another trick I have is food bars (Atkins, Powerbar, Balance). I can eat it while being distracted and it is over before I notice. Fuel is in the system and I am functional again. I try not to eat more than one of those a day.