All oils, including olive oil, are 100% fat. All oils are packed with calories. They are calorie dense. This means you get a large number of calories in a small amount. All naturally occurring oils are mixtures of different types of fats. Olive oil is 78% monounsaturated fat, but also contains 14% of the unhealthy saturated fat which clogs arteries. It has less than 1% of the healthier omega 3 fats. In a study from the University of Maryland, researchers found that eating bread dipped in olive oil reduced dilation of the brachial artery. This suggests temporary injury to the endothelial cells or lining of the arteries. In comparison, olive oil is “better” than other oils or fats which contain more saturated fat. Butter is 66% saturated fat and margarine is 18% saturated fat. It is “healthier” than other oils such as peanut or palm oil. Olive oil does taste good, especially on salads. Although, a salad smothered in olive oil is not healthful or slimming. It will add a large amount of calories. Putting a small amount with several times as much balsamic vinegar tastes just as good or better and has less calories and fat. If you are trying to lose weight, it is important to try and avoid all oils which are calorie dense.