It's because it's delish!
You should try marissa peers, who talks about milk in her book and hypnosis, as puss filled white cows blood. She will also cure you of any bread addiction you have, by asking you to take a piece of bread and squeeze it into a ball. Then think about eating it...uuuuugh, worked for me! Bread doesnt look so appealing when it looks like a lump of dirty play-dough.
I am finding it hard, but resisting picking everytime I feed my young children. Then when away from food I think, why would I want to eat that and espcially, why would I have wanted to eat cold leftovers off their plates. All just bad habits. I have had a few things in my mouth and then spat them out - again just getting over the habit.