The thing most “a calorie is a calorie is a calorie” people miss is that, according to the Low Carb, High Fat hypothesis, different types of calories affect the

The thing most “a calorie is a calorie is a calorie” people miss is that, according to the Low Carb, High Fat hypothesis, different types of calories affect the rate at which you expend calories. So, the theory is that a high fat diet makes more calories available as fuel and your body responds by making you feel more energetic, which leads to behavior that expends more calories. Whereas high carb diets, because of the way the body processes carbs, make less calories available as fuel and your body responds by making you feel less energetic, which results in behavior which expends less calories. So a calorie is not just a calorie. That’s the theory, at least.