I've been wanting to expound upon my first post about this notion for quite some time, but since my colleague Timothy Ferriss posted this yesterday, I figure "why re-invent the wheel?" I've been a proponent of the "a calorie is not a calorie" mindset for quite some time, and Tim explains it well along with Dr. Michael Eades in the interview.
Basically, although fat is the highest in terms of calorie count by weight, I don't believe the body stores fat as fat. Instead, it uses fats for cell repair/regeneration, etc. That's pretty important stuff. This is also why I think there is an epidemic of psychological disorders in Westernized nations (to include depression and ADHD) - because of the "low fat" diets that have been so popular for years. To clarify: I said I don't believe the body stores the fat you eat, it stores the unused carbohydrates you eat as fat. Why do you think farmers feed their pigs and cows grain in order to fatten them up as quickly as possible for slaughter? If the fat we consume turns to fat, why aren't farmers feeding their livestock….fat? If you're overweight, there's a very good chance your diet consists of too much sugar and other refined white carbs like flour. Think about it.
I am a vegetarian (I do eat dairy and seafood) so I feel compelled to say that while we are essentially promoting a low-carb diet here, that doesn't have to mean eating a lot of meat to compensate for the lack of carbs. My diet largely consists of vegetables, beans, nuts and whole grains. I always choose the full-fat version of dressing (or sour cream or whatnot) and use healthy oils such as olive and coconut liberally (yes, coconut oil is saturated - not all saturated fats are bad, either.) Fats and oils help make you feel full in the same way meats do. And by the way, once you start eating this way on a regular basis, you won't miss the other stuff after awhile. Go cold turkey on the sugar - it can be as addictive as cocaine.
This link will take you to all four fascinating posts by Tim on this important topic.