I said total calories consumed vs. total calories burned. I'm not concerned with how many grams of fat, protein or carbs you consumed. I am only concerned with total calories.
Fats, carbs and proteins are metabolized differently. So are simple carbs vs. complex carbs. But, when you're talking about obesity, that discussion really isn't all that important. What's important is the total number of calories a person consumes vs. the total number of calories they burn. Michael Phelphs can eat 20,000 calories a day from fat, carbohydrates or protein (or a combination of all three) and not get fat. A couch potato can eat the same thing and become obese.
This is a pretty simple concept, really.
Fiber has 4 calories per gram, but it cannot be used by the body.