This is simply not true, much less a "fact". This myth most probably comes from the good old American Heart Association who base their opinion of a study way back in the 1960s which was since proven to have been of extremely low quality. There is a ton of info about this online (including scientific studies, not just blog posts), pro and contra, you can read them yourself and then decide who you believe.
And butter and olive oil are one of the most healthy foods you can consume in my opinion <= there you have another point of view on the internet :)
Thanks for your advice but unless you're willing to share that "ton of info" to support your rather absurd claim, I'll stick to my common sense.
Besides, the AMA also uses the research from all the other decades from the 1960s until now to make their recommendations.
Sometimes you have to look at the bigger picture
What I meant is what I tried to communicate in my last sentence: olive oil does not appear to be that healthy when put into the perspective with other food we use in kitchen.
With that in mind, I think that general recommendation and hype around the olive oil can be dangerous if not taken carefully.
However, I am starting to be wary of this claim because olive oil has a _lot_ of saturated fats when compared to other food, roughly around 15-16g per 100g.
To put this figure into the context: 20% cooking cream, which is usually considered unhealthy because of its high saturated fats ratio, has about the same amount of saturated fats as olive oil, 14-15g per 100g. Saturated fats in butter are exceptionally high, 51g per 100g.
What was surprising to me is that even the sunflower oil, an oil which is frowned upon because it's refined, has _less_ of the saturated fats than olive oil, roughly around 13g per 100g.
All the rest of the food which we normally consume is in the region of 1-5g per 100g, including the eggs which have 1g of saturated fats per 100g.
By knowing for the fact that saturated fats are unhealthy, these stats seem to suggest that olive oil is not as healthy as it is generally considered.