I just watched this speech by Dr. Mike Eades while putting in my time on the treadmill. You’ll want to watch this — even if you’re not on a treadmill. Dr. Eades explains why he believes crappy vegetable oils act like a super-carbohydrate and increase our appetites for more carbs. He gets into some complicated biochemistry here and there, but you don’t need to understand every bit of it. Just pay attention to how different fats affect our fat cells.
I’ve pointed out many times that back when most kids were lean, they weren’t on ketogenic or strict low-carb diets. They ate sandwiches and potatoes, but not as many carbs overall as we eat now. The difference in appetite and the tendency to store calories as body fat may come down to the fats we consumed then vs. now. Enjoy.