I would say they are “not dangerous”. Some corners of the internet buy into a conspiracy about food oils basically being poison (seed oils, in particular), which is indeed entirely false. But no oil/fat is harmless when consumed in excess of what your body needs. Again, see modern industrial food processing and the way it bypasses our sense of taste and self-regulation of hunger.
But there is nothing about modern refined food oils that would make them more harmful than any other fats.
transfats for one are commonly considered unhealthy. processed industrial seed oils are heavily oxidized when consumed, have plant sterols that interfere with proper cholesterol function. They do lower LDL, which is why people like them, but that isn’t a good thing.
transfats for one are commonly considered unhealthy. processed industrial seed oils are heavily oxidized when consumed, have plant sterols that interfere with proper cholesterol function. They do lower LDL, which is why people like them, but that isn’t a good thing.