No, I'm not. I am saying that humans are complicated, and that the effect of food on weight is not simply down to "how calorie dense is this substance." Unless

No, I'm not. I am saying that humans are complicated, and that the effect of food on weight is not simply down to "how calorie dense is this substance." Unless you are force-feeding a person into obesity, other factors beside caloric density matter a great deal. You may want to do some reading on the satiety response. You could also imagine whether you think you would gain or lose weight over the next month on a tallow-only diet.