Olive oil is an integral part of the "Mediterranean diet" which is associated with sensible tasty portions and slower, more enjoyable eating. People who eat a "Mediterranean diet" have been shown to have a remarkable variety of health benefits. The olive oil in the Mediterranean diet can quickly satisfy hunger and lead to fewer total calories ingested at mealtime. It is unclear if any single component of this diet is responsible for these health benefits or if it is a combination of olive oil and a diet high in vegetables, fruit and fish.
Extra Virgin olive oil is one of the few oils that can be eaten without chemical processing. (Nearly every other vegetable oil has been detoxified and refined with steam and solvents). Fresh pressed olive oil can be eaten immediately and retains the natural flavours, vitamins, minerals, antioxidants, and other healthy products of the ripe olive fruit.
Most doctors recommend lowering total fat and calories in your diet, and substituting butter, margarine and tropical oils with healthier options like olive oil.