Everything In Moderation

Don't completely cut anything out of your diet. In psychological terms, when you tell yourself you can't have something, it makes the need for that one thing that much more intense. Fat and every other "unhealthy" thing are essential to the body and even healthy when taken in moderation. On some diet plans, you are given a day off. For individuals on those diet plans, I've found it to be a common phenomenon for people to eat the one thing they have cut out all that day, which is not necessarily healthy. But if you know you can have it, it will be easier to choose healthier alternatives to replace it. Ie, if your weakness is fritos and you know you can have them, it will be easier to tell yourself that today you will have carrots instead.