As I just amended my comment up-thread to say: allergies. Food allergies can kill you, and nut oils (nuts being a fairly common, and often severe allergen) are

As I just amended my comment up-thread to say: allergies. Food allergies can kill you, and nut oils (nuts being a fairly common, and often severe allergen) are sometimes used used as an olive oil adulterant. Adulterated olive oil isn't even labeled that it's adulterated, let alone what with.