Discipline is not something you are born with. It is a mental muscle that needs constant training. Like any other muscle, if you don’t use it, it will weaken. It takes more than just wanting to be disciplined. It is an ability that must be developed and tended to. If it appears easy for some, it is because those people have cultivated it for a very long time.
It isn’t something you can grab out of the top drawer when you need it. You have to have it ready when you need it. Begin slowly by creating a reward and consequence game for your behaviors.Remember no muscle gets into shape immediately. You have to methodically build it and maintain it. All your choices affect this muscle.
(taken from my book: "Head Over Meals-Thinking Your Way To Being Thin Happy & Healthy")