Butter not only tastes better than margarine, it melts at a lower temperature, is easier to digest, and one can use less to the same effect....yeah, less...HA!
Bacon fat and lard also melt at a lower temperature and taste better.
Real or not, like this study. Fits the “eat ‘right’ (some dispute here), stay fit, die anyway” paradigm.
Animal protein, butter, veg, fiber, some complex carbs....BGL looking pretty good. Your mileage may vary.
I have read that the healthiest cooking oil is coconut oil. It is also very expensive.