I don't really think it's possible to stop the (urge) to want to eat.
You simply have to (choose) either a different activity such as going to the gym, taking a walk, reading, watch a DVD, or eat something "healthy" like a garden salad, celery sticks, baby carrots, or some fruit.
I've been a bit of an emotional eater all of my life. I eat when I feel blue and I eat to celebrate! My weakness is bread and bread like products (pizza, donuts, cakes, dinner rolls, garlic bread, pancakes, waffles, biscuits) and throw in some cheesecake, potatoes, chips, milkshakes, burgers, hotlinks, and fried foods like bacon, chicken, sausage and ice cream, I'm good to go!
What I find most interesting about being an "emotional eater" is the fact that we tend to be (selective) about whatever it is we love to eat in that moment! It's not just about wanting to eat anything. You have to force yourself to eat a cucumber or a banana instead of a polish sausage with grilled onions and large fries along with soda/refills. Controlling what you eat is more important than worrying about forcing yourself to stop eating.