I’d be interested to see them do a similarly structured study comparing the effects butter and lard to soybean and canola oils. Look at crowd pictures of Americans from the first half of the twentieth century. Very few fat people at a time when published recipes simply used the word “fat” for added shortening, and with the exception of Mediterranean cooking that meant butter or lard. And sweetener meant real sugar, not corn syrup and synthetic rubbish. Of course, people back then also were more physically active, walking most places and doing work instead of pointlessly exercising at the gym on treadmills, basically human size mouse cage running wheels.
I have one, I see if I can't find it...
Basically vegetable oils are hydrogenated fats (unsaturated) versus saturated fats like coconut oil, lard, butter and flaxseed oil
Hydrogenated fats molecules are straight and tend to clump together which clogs arteries
Saturated fats molecules are bent and do not clog arteries
Daily Mail UK ran a story about a week or two ago reporting (well, what passes for reporting at the DM) on a study where lard actually was found to be better than sunflower oil for frying food...shouldn’t be hard to look up.