Evaluating the healthfulness of a particular type of fat is a matter of comparison. Though butter is better than margarine and other trans fats, vegetable oils with a blend of polyunsaturated fats or monounsaturated fats, such as olive oil, are even better. These can be used to replace saturated fats in the diet:
Extra-virgin olive oil
Extra virgin olive oil. Extra-virgin refers to oil produced from the first cold pressing of olives — a process that maintains the best flavor and highest levels of nutrients. (Ricardo DeAratanha / Los Angeles Times)
A staple of the Mediterranean diet, olive oil has long been associated with a reduction in cardiovascular disease. Extra-virgin refers to oil produced from the first cold pressing of olives — a process that maintains the best flavor and highest levels of nutrients. Olive oil is rich in omega-9 fatty acids, which decrease levels of LDL cholesterol in the blood, as well as phenols, which reduce inflammation and may help metabolic conditions.
Click through for a pretty comprehensive list of other cooking oils… via A list of healthful oils for cooking and eating – LA Times.