What kind of oil is healthiest for cooking?

Olive oil: Olive oil not overheated.

Olive, coconut and..: Olive oil is healthy for cooking at low temperature but is not healthy when exposed to high heat. For higher heat i recommend coconut oil, which has many health benefits and does well at high temperatures. Hi-oleic safflower oil is also good for high temperatures. See http://integrativemed.Kumc.Edu/school-of-medicine/integrative-medicine/health-topics/healthy-cooking-oils.Html for a good article.