In reply to Pesda potato:
Last I heard was olive oil is good, and saturated fats aren't the evil they were once thought to be, and that some oils when used in frying can be carcinogenic (possibly including olive oil), and lead to mood changes which aren't pleasant, and may have other negative things related to them. I'm very sure it's sun flower oil when used in frying which is thought to lead to negative mood changes (to a certain degree).
For myself, I just try and exercise a lot, and use olive oil in cooking (not frying) and eat some oily fish once a week, with bits and pieces of saturated fat in things which I fancy eating. A Mediterranean diet is ment to be particularly healthy I gather.
Edit:What Jon Stewart says has a ring of seeming true.
Post edited at 21:42