How can I stop?

What can I think and do to stop when I am eating the food that I like when I feel full? I do sense that I am full and am very aware of my body as well as can easily distinguish between emotional hunger and sensation in my body, but I still won’t stop. I tried telling myself, “It’s ok. You don’t have to have it all right now. You can have it later. It’s not going anywhere.” But that does not help. I keep eating like this is my last chance ever to have that kind of food. I want to be able to stop.