Why would humans have Chylomicrons if we were not meant to eat fat? Also why do they by-pass the hepatic-portal system and enter circulation through the lymphatic system? Seems to me as if this adaption makes it very important.
And since the main source of fat prior to seed oils was animal fat, with some nut fat and olive oil, it becomes hard to believe fat absorption was not meant to be animal fat.
Don’t forget the first seed oils were brought to market in the early 1900’s (Crisco, 1912). Incidentally that is about a year before the AMA first really thoroughly described a heart attack. Before that cottonseed oil, soybean oil and rapeseed oil were used as industrial lubricants. Pseudo-food is much more profitable!