Butter vs margarine.... I quit eating either.... well except sweet corn. Just doesn't taste the same with olive oil. Although I use butter from goats nowadays.It's been my experience that whatever conclusion is drawn by the 'researcher' doing the research is usually based on an in going bias of the 'researcher'.
How many times in the last 20 to 30 years has the same chicken egg that has existed forever flip flopped between good and bad based on 'research'.