Hungry all the time

I can't seem to shake off my constant hunger. This is something that has plagued me for years. Now that i'm slowly approaching old age, i realised that if i don't do something about it now, i'm gonna end up as one of those super obese old ladies all hunched up in a chair in a care home, bugging the nurses when teatime would be, when i'd just had my dinner or something... Anyhows, i'd thought my healthy eating regime was going all so well, with my nettle tea and cod liver oil pills, when my clinical partner rudely reminded me: How to be slim when you are eating all the time??? Then i realised that it was indeed true. That day we had the conversation, I had polished off a box of special K + 1L of milk (skimmed, mind you) and 1 mars bar ("giant", according to Terri), plus a few random biscuits on top of my 3 meals which probably consisted of more than my daily requirements of 2000 calories...
The question is, how do you not eat when you are truly hungry??? PRAY TELL!!!

Currently eating: Walkers Prawn Cocktail Crisps and Aero chocolate.
Currently reading: One Shot by Lee Child - its an american thriller, and is rather addictive!