Just wanted to add that if you read THE END OF OVEREATING by David Kessler you'll find out that certain food combinations are in fact addictive, and that many chain restaurants and fast food places deliberately craft their food for this purpose. They are in the business of selling food, so it is in their interest to make it addictive to keep people coming back. The book describes the studies that back this up.
"My religion is kindness." --His Holiness the Dalai Lama