The benefits of olive oil for your health are numerous and here are some more information.
Research has shown the incidence of heart disease is dramatically lower in Mediterranean countries where olive oil is a dietary staple than in areas where consumption of olive oil is less voracious. Science has now determined that olive oil, as a monounsaturated fat, increases HDL or good blood cholesterol.
However, it is still important to remember that olive oil is still a fat and should be consumed in limited quantities, in proper ratio to your balanced diet. Olive oil averages about 125 calories per tablespoon, depending on the variety, yet has little or no carbohydrates and zero sodium per 1 tablespoon serving.
Source: about.com