The new work out of the UK is that exposure to peanuts at a young age gets rid of peanut allergies later. It appears the immune system in some people needs the exposure to jumpstart. I would not be surprised if the advice about not eating nuts reverses in the next few years.
As for adulterated olive oil, it’s been a scandal for a very long time. There was even a famous instance of a poisonous oil mixed in with people seriously injured and dying. This is one reason I tend to buy from places like Costco because they carefully source their oil. Or from the US.
Note that adulterated refers to both nonEVOO sold as and stuff sold as “Italian” or whatever and actually being a mix of oils, much of them cheaper ones.