I think of it like this. How does everything I eat fit into the plan. Am I getting Protein from it? Is it high in sugar or carbs? Am I getting any nutritional value from it? If not, it is simply too high a price to pay. Thinking from a money analogy, if a piece of cake cost $100, you would do without it, simply not worth it. The same logic is how I treat those foods high in fat, calories and carbs. Not worth the price my body pays. Need a snack? Find something that provides some benefit to you.