Self-Discipline?

Lysa TerKeurst has been discussing how she is winning the battle with food on her blog. (http://lysaterkeurst.blogspot.com) It's a very thought provoking read. I know I need to let go of the caffeine, and the junk food. But I like it. Self-discipline where are you? Realizing there is a problem is a good start. Now to take it to the next level. Help!