There are videos that show studies on seed oils vs non seed oil diets. IMO diary fats, lard, animal fats, tallow, suet, coconut oil, are all good for you. Olive oil is OK.
There was some famous study done where diets could be controlled, in a mental hospital. people were sicker and died on the vegetable oil diet than the animal fat diet as I recall. Maybe it was the higher carb vs animal fat diet. The researcher took it to his grave because it reached the wrong conclusion. Modern researchers got his mag tapes with data from his basement and published the study.