Your body can process animals fats much easier than anything artificial, some of the butter substitutes, you might as well be surgically adding it to your arteries. This was from some date line (or some such beast) news show a few weeks ago. Butter is the easiest way to go. The olive oil mixture is indeed healtier as long as it's not heated. All the good fats in olive oil turn immediately into bad ones when heated. I found this out when taking a Thai cooking course taught by The Heart Foundation chef.