All-or-Nothing. This kind of reasoning is the foundation The Favorite Foods Diet for perfectionism. An all-or-nothing individual views the world as black or white. Since there is no allowance for gray areas, the behavior is either perfect or a failure. “I’ve ruined my diet by eating all that pizza. I can’t stay on a diet and I’ll just always be fat.” Maybe the problem does not arise from the behavior… maybe the problem is with the diet that does not allow for pizza. “I do not want to give pizza up for the rest of my life, so what I need is a way to include pizza in my diet without feeling like a failure. Let me try having a salad (dressing on the side) before the pizza to take the edge off my hunger.”