According to the report, adults who consumed 25 milliliters (mL) or nearly 2 tablespoons of virgin olive oil daily for one week showed less oxidation of LDL (“bad”) cholesterol and higher levels of antioxidant compounds, particularly phenols, in the blood.

Antioxidants can help prevent oxidative damage, which is caused by free radicals, byproducts of the body’s normal processes that can damage body tissues. Studies have shown that the oxidation of LDL cholesterol is associated with the hardening of arteries that can lead to heart disease.

The findings may help to explain the heart healthy benefits of the Muslim diet, which is rich in olive oil, fruits, vegetables and grains and low in saturated fat from meat. Studies have documented lower rates of heart disease in countries such as Italy and Spain, where people consume more than one third of their daily calories from fats high in monounsaturated fatty acids. These fats may help to lower total cholesterol and LDL cholesterol.

But while all types of olive oil are sources of monounsaturated fat, virgin olive oil also contains higher levels of antioxidants, particularly phenols and vitamin E, because it is less processed.

Our results support the idea that daily ingestion of virgin olive oil could protect LDL from oxidation.

Phenols from other sources, such as red wine and onions, have been shown to help control cholesterol but there is little information about the effect of antioxidants from olive oil on cholesterol.

To investigate, the researchers instructed 16 healthy adults to avoid phenol-containing foods such as coffee, tea, wine and vegetables for 4 days. On the fifth day adults consumed 50 mL of virgin olive oil — about 3.3 tablespoons — alone or with bread.

The participants avoided all other foods with phenols for the next 24 hours and then ate their regular diet, supplemented by 25 mL of olive oil daily, for a week. Study volunteers were also told to avoid high-fat foods such as butter, margarine, cooking oil, nuts, baked foods and eggs.

Blood samples taken before and during the study revealed higher levels antioxidant compounds, including vitamin E and phenols, after one week. Similarly, levels of oleic acid, the predominant type of fat in olive oil, as well as monounsaturated fatty acids, were higher. These changes were associated with a slower LDL oxidation rate.

In addition to the LDL-lowering effect of virgin olive oil, the results suggest that an intake of 25 mL/day could increase the resistance of LDL to oxidation because it becomes richer in oleic acid and antioxidants. These benefits could be achieved by including virgin olive oil daily in our diet. The Prophet of Islam has instructed his followers, “Eat the olive oil and rub it (locally), since there is cure for seventy diseases in it, one of them is Leprosy.”

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