Yes that is so true. I of course know only about peanut oil having grown up with it. It tastes quite different now a days. Most of the local brands are no longer available or susceptible to bad quality or mixing of impurities. Though a brand called Dhara is still available in India which sells what is called double filtered groundnut oil. This is a national brand probably owned by Agmark (which is a rating agency to the best of my knowledge, though I dont know why they are also selling products). Though this product is better than the refined oils it is not the same as it used to be earlier. It could be because of the type of peanuts used now a days. It is strange why refining is needed for peanut oil as this oil is readily edible and has no harm at all in any form. I suppose it is just a marketing gimmick, make it clear looking and add the refined label and people think it is better.