We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
There are several reasons why calories- in and calories- burned equations are too simple for the complexity of animal physiology. For one thing, the calories in protein are handled differently from those in fat or in carbohydrates. Another reason is that our metabolism adapts to our nutritional intake as best it is able to.
Other than hibernating animals, few animals are adapted to handle the sort of abundance that humans have remarkably produced with brains capable of entirely changing the planet's surface and modifying nutritional sources for its own purposes. Humans are nutritional outliers, and it is not "natural." In a sense, humans are not natural animals because of the extent to which they remake nature for their convenience.
It means you have trained your body to adapt to a plentiful flow of fresh carbs and sugars (sugar is carbs and vice-versa) so it takes the burden off using fat as a fuel. Intake trains the body that way. Thus what we term the "False Hunger" of overweight people. Human physiology will never adapt to modern abundance of food because fatness tends to kill or disable people after child-bearing years.
Among other reasons, Fat Adaptation is one of the reasons heavy people feel more hunger and end up consuming food more avidly and in higher volume than trim people. In fact, overweight people have zero dietary energy requirements and minimal nutritional requirements despite subjective hunger.
Unless you followed that advice of doctors and the American Heart Association and avoided meat and eggs, etc. and ate “plenty of heart healthy whole grains” and screwed up your metabolism and gave yourself metabolic syndrome. If you have that, your body stores food as fat to the starvation of your body.
I do think that you may have it reversed. For the last eight months, I have been doing the low carb-high fat way of eating. No sugar, no grains. Our goal is to BECOME fat-adapted. As I understand it, fat adaptation describes the switch over when one’s cells burn fats, both dietary and body fats, for fuel instead of glucose. And I think that is what Mark Sisson’s article I saying. Or am I misunderstanding something?