If you watch
(while it still exists) you will find a report on what was called a landmark study applauded by the New York Times and many more saying you could eat olives, olive oil, nuts, fish, wine etc - and that it is heart healthy!
The authors have now decided the paper was fundamentally flawed and have fully retracted the paper. My favourite take on the retraction is by Dr Pam Popper
which looks into the actual results - and shows no statistically significant benefits in the touted dietary improvements. Not only that but also the design of the research was not randomized, as claimed!
My advice - at least look at who is funding the research to see if there is any funding bias. In this instance the research was paid for by the olive oil industry!
Indeed this forum has been using this exact study to justify consuming olive oil. For instance healthline.com/nutrition/ex... says "Studies on the Mediterranean Diet show that it can help prevent heart disease. In one major study, it reduced heart attacks, strokes and death by 30% (15)." as touted by Authority Nutrition.
30% is a huge difference. And now this paper is retracted. All because the study was rigged and in fact there was NO statistical significance.
PS I am not saying that all industry funded science is bad science, but rather that it needs to by critically assessed for industry bias as well as any other tests for scientific validity.