I see your point, thanks for the insight! Did you base your reply on the abstract or the full article, because they do specify “vegetable” oil. Also, in their defence, they not only state that they only intended to show a correlation instead of a causal effect, and even add that:
we only found the relationship between the cooking oil type and cardiovascular health in the elderly over 65 years old in China, and could not explain the reason.
I’m sure someone already made a graph plotting the hours wasted learning vs the seconds gained not moving your mouse.