Unfortunately Lardarse, I fear you have a slightly warped perception of what's normal.
I have always been thin but my weight has never dropped into the danger zone. I'm 6ft 1" and 10.5 stone which gives me a BMI of around 19. It's on the low side of the normal range but in the normal range it is. My concern is more driven by the fact that I have only upped my mileage significantly in the last two months and this has inevitably resulted in further weigh loss - I don't want to fall into the danger zone.
Running does not make me any more hungry, though. I have been eating the way I ate when I was doing 10/12 miles a week but I did 45 miles last week yet i'm still only hungry for the same amount of food. That's the problem.
The fact that I have spent all my life in the "ideal" BMI zone and you seem to be outside of it suggests to me that it is you who has had a more unhealthy relationship with food/diet than me. That isn't intended to be a dig, it's just to perhaps make you think a little differently about your perspective here.
For people in a normal weight bracket, eating a whole loaf of bread in a day is an absolutely preposterous notion. I don't know anyone who eats this way.
"I know given free reign I will eat until i'm stuffed, feel ill and then carry on eating a bit more."
That doesn't strike you as peculiar? You'll eat so much that you don't feel well, then ignore what your body is trying to tell you and then eat some more? Sorry mate but that just isn't sensible and it's little wonder you've struggled with your weight.
It's good that you're doing something about it though and it's to be applauded that you're losing weight. I hope you get where you need to be. You should try and be more understanding of people with different constitutions to you though. I'm happy being thin and absolutely love my food (you should see my book shelves. 6 shelves, 3 of them crammed with cook books. I love food) I just don't want to get too thin, just like you didn't want to get too fat.