Vegetable, Canola, Corn, Olive, Peanut, you name it. Why should I use one oil over...?

...another? What's the difference? And what are the pros/cons in regards to health? I know olive oil is supposed to be a little more healthy. What about all the oils that boast about the omega 3s and stuff? What about all the other oils (Veg, Corn, Canola, etc), why are they so unhealthy? Why should or... show more ...another? What's the difference?
And what are the pros/cons in regards to health?

I know olive oil is supposed to be a little more healthy. What about all the oils that boast about the omega 3s and stuff?

What about all the other oils (Veg, Corn, Canola, etc), why are they so unhealthy?

Why should or shouldn't I be using any of the above oils?
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