All vegetable oils (canola oil, soybean oil, corn oil, sunflower oil, etc.) are extracted using the poisonous solvent hexane. According to J. Stanton, "vegetable oil isn’t a food. It’s an industrial product, and it has no place in our diet."
Olives are a fruit, and the oil has been used for centuries for its incredible flavor, health benefits, and healing properties. To reap all these benefits, you must be sure you are using pure, unadulterated olive oil without any vegetable oils added.
Know your source -- labels cannot be trusted!
Read more on this topic:
Why You Should Never Eat Vegetable Oil or Margarine at wellnessmama.com