To conclude, most people are not eating a high healthy fats diet, the bulk of their foods are highly processed carbohydrates, very often mixed with very un-healthy fats. Many are eating too much food together with minimal physical activity. I have never said anyone can eat whatever they like in terms of calories, whatever foods they eat, and lose or maintain a healthy weight.
That being said, a calorie is not just a calorie, for people who suffer from metabolic problems, the source of calories plays a huge roll in health outcomes. It is my opinion the combination of a high fat, a high, highly processed carb diet, is the worst possible and has contributed greatly to the epidemics of obesity and its often linked type two diabetes.