- All fats are more than twice the calorific density of carbs/proteins. Disagree? - Good fats will still make you put on weight if you eat a lot of them. Disagree? - Predominate attribute used to decide "good"/"bad" is effect on heart/cardiovascular health. Disagree? - Essential fats cannot be metabolised by the body from simpler substances. Disagree? - All calories have the same energy content by definition, and apart from details will make you fat at the same rate per amount eaten. Disagree?
I think it's pretty obvious that I don't believe "fat [alone] makes you fat" as in the quote but health fat most certainly will if you eat a lot of it. I haven't read the famous popular book on the subject, but my understanding is that the thesis is based on things like satiety and a new take on heart health, not a fundamental difference in "types of calorie" re: weight gain. Regardless, downvoting seems inappropriate.