| Like for most nutrients, both too much and too little are bad. The olive oil and the other vegetable oils with high content of oleic acid, e.g. high oleic sunflower oil, avocado oil and others, also include adequate amounts of linoleic acid, which is an essential nutrient (e.g. when the daily intake is too small, various skin problems appear). The cheaper vegetable oils, e.g. classic sunflower oil, corn oil, soy oil and others, contain far too much linoleic acid (which can cause liver problems). The use of such vegetable oils in human food has begun very recently, only in the 19th century, after their industrial production has been developed. For example, I choose carefully the sources of fat in my food and in a typical day the fat comes from 54 g (60 mL) of olive oil + 33 g of almonds + 9 g (10 mL) of cod liver oil. (That started after being diagnosed with some incipient heart problems, which seem to have been corrected after a year of more careful food choices.) Both olive oil and almonds contain fat where oleic acid is the most abundant fatty acid. Their quantities are computed so that they also provide adequate daily intakes of linoleic acid and vitamin E. The fish oil adds an adequate amount of omega-3 fatty acids. |