Olive oil is a liquid fat obtained from olives (the fruit of Olea europaea; family Oleaceae), a traditional tree crop of the Mediterranean Basin. The oil is produced by pressing whole olives. It is commonly used in cooking, whether for frying or as a salad dressing. It is also used in cosmetics, pharmaceuticals, and soaps.

DESCRIPTION
Extra-virgin olive oil is made from pure, cold-pressed olives, whereas regular olive oil is a blend, including both cold-pressed and processed oils. … Any cold-pressed oil that doesn’t meet extra-virgin standards is then refined to get rid of undesirable impurities, giving the oil a more neutral flavor and lighter color.

COMPOSITION
The composition of olive oil varies with the cultivar, altitude, time of harvest and extraction process. It consists mainly of oleic acid (up to 83%), with smaller amounts of other fatty acids including linoleic acid (up to 21%) and palmitic acid (up to 20%). Extra virgin olive oil is required to have no more than 0.8% free acidity and is considered to have favorable flavor characteristics.

BENEFITS
Olive oil can be flavored with herbs and spices, which you can steep in the oil for 10 days or so. If you’re using chili, you need far less time. However, it’s important to note that olive oil is not recommended for cooking — it should only be used cold, usually drizzled on salads and other foods. Extra-virgin olive oil’s chemical structure and its large amount of unsaturated fats make it very susceptible to oxidative damage when used for cooking. Whenever you need an oil to cook with, use coconut oil or grass fed butter.

Improve arteries elasticity – Consuming Extra virgin olive oil can make the arteries more healthy and elastic. It leads to the efficient and normal blood flow through the body. Healthy and elastic artery make it possible to pass the nutrients from blood to other parts of body and this may prevent the development of hypertension.

Reduce bad cholesterol levels – Olive oil contains polyphenols, which help to keep your levels of LDL cholesterol within healthy ranges. As we know that olive oil contain only good fat, its really healthy and lower the risk of having excessive cholesterol in the body.

Improve brain memory – Some research has shown that olive oil can prevent brain cells damage and possibly it can improve brain neuroligal function especially memory. Based on research from the University of Massachusetts at Amherst consuming extra virgin olive oil regularly can improves memory of brain by 25%.

Antioxidant content – Olive oil may help prevent premature signs of aging on the skin.
Olive oil acts as an antioxidant, which is a substance that prevents oxidation. Oxidation is a process that can produce free radicals, which are chemicals that can potentially damage cells and may contribute to cancer development.

When applied to the skin, antioxidants may prevent premature aging. Also, some research suggests that putting olive oil on the
skin after sun exposure may fight off cancer-causing cells.

Vitamin content – Olive oil contains the fat-soluble vitamins A, D, E, and K. Some of these vitamins may be beneficial for the skin. People have used vitamin E oil topically throughout history to treat a variety of skin conditions, including psoriasis and eczema.

Moisturize – Olive oil is a more effective moisturizer than many commercial products, which tend to be water-based. You can massage olive oil into the skin by itself, or you can combine it with other substances. For example, you can add a fragrance by mixing in lavender oil, rose water, or lemon verbena. Olive oil can even be used to soothe more serious skin conditions such as eczema.

SOURCE :
https://articles.mercola.com/herbal-oils/olive-oil.aspx
https://oleo.healthcare/2017/08/10/34-proven-health-benefits-of-olive-oil
https://oleo.healthcare/2017/08/10/34-proven-health-benefits-of-olive-oil
https://www.medicalnewstoday.com/articles/321246.php
https://www.wikihow.com/Use-Olive-Oil-on-Your-Face