I agree. I'm old now but years ago at the time they kept advising against butter then against margarine back and forth, found that our brains need cholesterol. Since they started with statins and low cholesterol diets lo-and-behold now we have Alzheimers.

Of curiosity I looked back at my Ukrainian relatives and ancestors' diets. lots of starch covered in heavy grease esp bacon grease, butter (no one had margarine). Dementia was rare.