Proven Medical/Health Benefits of Olive Oil

The health benefits of olive oil are unrivaled, and research reveals more benefits nearly every day. In fact, we are only just beginning to understand the countless ways olive oil can improve our health, and our lives. Over the last 50 years, there have been thousands of studies examining the health benefits of olive oil. Below are some examples:

Olive oil and the cardiovascular system

Olive oil is the main source of dietary fat in the Mediterranean diet, which is associated with a low death rate from cardiovascular diseases compared to other parts of the world.

Maria-Isabel Covas, at the Parc de Recerca Biomèdica de Barcelona, Spain, carried out an extensive review of studies that had focused on the biological and clinical effects of olive oil.

The study was published in the journal Pharmacological Research². The study found that people who regularly consume olive oil are much less likely to develop cardiovascular diseases, including hypertension (high blood pressure), stroke, and hyperlipidemia (high blood cholesterol and triglyceride levels).

 

Covas also found that regular olive oil intake helps reduce inflammation, endothelial dysfunction (problems with the inner linings of blood vessels), thrombosis and carbohydrate metabolism.

Covas concluded "The wide range of *anti-atherogenic effects associated with olive oil consumption could contribute to explain the low rate of cardiovascular mortality found in Southern European Mediterranean countries, in comparison with other western countries, despite a high prevalence of coronary heart disease risk factors."

*Anti-atherogenic means preventing the hardening of the arteries and the development of atherosclerosis.

Frying with olive oil and heart disease risk

People who regularly eat foods fried in olive oil do not have a higher risk of heart disease or premature death, researchers at the Autonomous University of Madrid in Spain reported in the BMJ (British Medical Journal).

Olive oil may help prevent stroke

Dr. Cécilia Samieri, from the University of Bordeaux and the National Institute of Health and Medical Research (INSERM) in Bordeaux, France, and colleagues reported in the journal Neurology that olive oil may prevent strokes in older people.

The team found that older people who regularly used olive oil for cooking and salad dressing or with bread had a 41% lower risk of stroke, compared with their counterparts who never consumed it. Dr. Samieri said, "Stroke is so common in older people and olive oil would be an inexpensive and easy way to help prevent it."

 

Depression risk and olive oil

People whose diets are high in trans fats - fast foods and mass-produced foods like pastries - may have a higher risk of depression, compared with those whose diets are rich in mono- and polyunsaturated fats.

According to a study carried out at the University of Las Palmas de Gran Canaria in Spain and published in PLoS ONE, olive oil appears to have a slight protective effect regarding depression risk. Dr. Almudena Sánchez-Villegas and colleagues added that their findings stood even after taking into account people's overall diet, physical activity and lifestyle.

 

Olive oil may reduce breast cancer risk

A team of scientists at the Universitat Autonoma de Barcelona in Spain found a key mechanism by which virgin olive oil protects the body against breast cancer, in contrast to other vegetable oils.

The researchers decoded a complete cascade of signals within the cells of breast tumors that are activated by virgin olive oil. They concluded that the oil reduces the activity of p21Ras, an oncogene, prevents DNA damage, encourages tumor cell death, and triggers changes in protein signaling pathways.

The team found that while corn oil - which is rich in n-6 polyunsaturated fatty acids - increased the aggressiveness of tumors, virgin olive oil had the opposite effect. They demonstrated that virgin olive oil is linked to a higher incidence of benign (non-cancerous) breast tumors.

 

Olive oil helps maintain healthy cholesterol levels

A Japanese study published in the Medical Science Monitor³ showed that LDL-cholesterol mean concentrations were lowered in 28 outpatients who were given olive oil supplements once a day for six weeks.

LDL (low density lipoprotein) is often referred to as "bad cholesterol". The "good cholesterol" is called HDL (high density lipoprotein). The study authors concluded "These results point to an overwhelmingly beneficial influence of olive oil on the lipoprotein spectrum."

Extra virgin olive oil and alzheimer's disease

 

Oleocanthal is a type of natural phenolic compound found in extra-virgin olive oil. In laboratory experiments with mice, researchers discovered that oleocanthal helps shuttle the abnormal Alzheimer's disease proteins out of the brain.

As background information, the researchers explained that Alzheimer's disease rates are lower in Mediterranean countries, where consumption of olive oil is higher than anywhere else in the world.

Amal Kaddoumi and team set out to determine whether oleocanthal might help reduce the accumulation of beta-amyloid, believed to be the culprit of Alzheimer's disease (AD). Their study was published in the journal Chemical Neuroscience.

 

The team tracked the effects of oleocanthal in the cultured brain cells and brains of laboratory mice. They found that in both cultured brain cells and the mice's brains themselves oleocanthal consistently boosted the production of two proteins and key enzymes known to be vital in the removal of beta-amyloid from the brain.

 

The study authors concluded "Extra-virgin olive oil-derived oleocanthal associated with the consumption of Mediterranean diet has the potential to reduce the risk of AD or related neurodegenerative dementias."

Extra virgin olive oil and acute pancreatitis

 

Extra virgin olive oil is rich in oleic acid and hydroxytyrosol, which affect the development of acute pancreatitis (sudden inflammation of the pancreas).

Researchers at the University of Granada in Spain carried out an in vitro experiment which found that the components of extra virgin olive oil can protect from acute pancreatitis. Head researcher, María Belén López Millán said that "there is increasing evidence that there are oxidative-inflammatory processes involved in the origin of chronic diseases and that diet plays an important role in such processes."

 

Olive oil and the liver

Investigators at the University of Monastir, Tunisia, and King Saud University, Saudi Arabia, carried out a study demonstrating that extra virgin olive oil may protect the liver from oxidative stress. Oxidative stress refers to cell damage associated with the chemical reaction between free radicals and other molecules in the body. Put simply, oxidative stress means cell damage.

In this study, which was published in BioMed Central, Mohamed Hammami and colleagues reported that laboratory rats exposed to a moderately toxic herbicide that were fed on a diet containing olive oil were partially protected from liver damage. Hammami said "Olive oil is an integral ingredient in the Mediterranean diet. There is growing evidence that it may have great health benefits including the reduction in coronary heart disease risk, the prevention of some cancers and the modification of immune and inflammatory responses. Here, we've shown that extra virgin olive oil and its extracts protect against oxidative damage of hepatic tissue".

 

Olive oil may help protect from ulcerative colitis

 

Ulcerative colitis, a fairly common long-term (chronic) disorder, is a disease that causes inflammation of the large intestine (colon). It is a type of inflammatory bowel disease that is similar to Crohn's disease, a related disorder. Scientists at the University of East Anglia in England say that consuming more olive oil could help fend off ulcerative colitis.

Dr Andrew Hart and team gathered and analyzed data on more than 25,000 people living in Norfolk, England. They discovered that the participants with the highest intake of oleic acid - a component of olive oil - had a 90% lower risk of developing ulcerative colitis compared to those with the lowest intake. Dr. Hart said "Oleic acid seems to help prevent the development of ulcerative colitis by blocking chemicals in the bowel that aggravate the inflammation found in this illness. We estimate that around half of the cases of ulcerative colitis could be prevented if larger amounts of oleic acid were consumed. Two-to-three tablespoons of olive oil per day would have a protective effect."

 

Diabetes

 

It has been demonstrated that a diet that is rich in olive oil, low in saturated fats, moderately rich in carbohydrates and soluble fiber from fruit, vegetables, pulses and grains is the most effective approach for diabetics. It helps lower “bad” low-density lipoproteins while improving blood sugar control and enhances insulin sensitivity. 

 

Osteoporosis

 

A high consumption of olive oil appears to improve bone mineralization and calcification. It helps calcium absorption and so plays an important role in aiding sufferers and in preventing the onset of Osteoporosis.

Rheumatoid Arthritis

 

Although the reasons are still not fully clear, recent studies have proved that people with diets containing high levels of olive oil are less likely to develop rheumatiod arthritis.

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