Nutritionists often recommend replacing fats like butter with healthier alternatives like olive oil. For the study, the researchers evaluated data from 60,582 women and 31,801 men from the Nurses' Health Study and the Health Professionals Follow-up Study. Both are long-term health studies that tracked the health of volunteers over time.
All of the volunteers were free of heart disease and cancer when the study period started in 1990. The study participants also weighed in every four years during a 28-year follow-up period about their diet.
The researchers took note of how much olive oil, other vegetable oils, margarine and butter the participants consumed. Overall, the volunteers consumed more olive oil over time. Intake increased from about 1.6 grams a day in 1990 to at least four grams a day in 2010.
Additionally, margarine use went down during that time from about 12 grams a day in 1990 to only about four grams a day in 2010.
During the study period, 36,856 volunteers died. Data showed that compared to those who rarely or never consumed olive oil, those who consumed the highest amounts of olive oil a day, or about nine grams (a little less than a tablespoon), had:
- A 29 percent lower risk of dying from a neurodegenerative disease like Alzheimer's
- A 19 percent lower risk of dying from cardiovascular disease
- An 18 percent lower risk of dying from a respiratory illness
- A 17 percent lower risk of dying from cancer
The volunteers who replaced 10 grams a day of fats like butter, margarine, mayo and dairy fat with olive oil had an up to 34 percent lower risk of dying.
Olive oil and your well-being
Keep in mind that the research team identified a link between volunteers who regularly consumed olive oil and a lower risk of dying from various diseases, but the results didn't confirm that consuming high amounts of olive oil actually causes the lowered risk.
Deborah Cohen, associate professor in the Department of Clinical and Preventive Nutrition Sciences at Rutgers University, explained that cause and effect "can only be evaluated in randomized controlled trials, which are very, very difficult to do; are expensive; and take a really long time to complete." She added that many other factors could be involved, like lifestyle behaviors such as smoking habits and how much physical activity the volunteers had regularly, other dietary habits and genetics.
It's possible that the volunteers who used more olive oil were healthier. For example, they might be more physically active, less likely to smoke and more likely to eat more whole foods like fruits and vegetables compared to those who ate less olive oil regularly.
Dr. Rigved Tadwalkar, a board-certified cardiologist at Providence Saint John's Health Center in Santa Monica, California, said these factors can help lower disease risk. He added that it's difficult to ignore "confounding variables," but that there's also something about the type of fats or oils people consume.
Olive oil is full of monounsaturated fats that can help decrease the amount of low-density lipoprotein (LDL), or "bad" cholesterol in your body. It also helps boost high-density lipoprotein (HDL), or "good" cholesterol.
A monounsaturated fat called oleic acid makes up 73 percent of the total oil content of olive oil. Research suggests that oleic acid can help minimize inflammation and may even have beneficial effects on genes often associated with cancer.
Additionally, monounsaturated fats are resistant to high heat, making extra virgin olive oil a healthy choice for cooking.
When you consume more monounsaturated fats, you also decrease the amount of saturated and trans fats you take in. This is important because all these fats are often consumed in excess amounts in typical western diets and are linked to different adverse health effects, explained Cohen. (Related: 5 Reasons to use cold pressed olive oil, a cooking oil full of healthy fats.)
Olive oil and Alzheimer's disease
In an accompanying editorial in JACC, Susanna C. Larsson, a public health researcher from the Karolinska Institutet in Sweden, discussed the "novel finding" that higher olive oil intake is associated with a lower risk of death due to neurodegenerative disease, or degenerative nerve disease. These conditions affect bodily functions like breathing, talking, balance and movement.
Alzheimer's disease is "the major neurodegenerative disease and the most common cause of dementia," wrote Larsson. Since there is a lack of preventive strategies for Alzheimer's and the high morbidity and mortality related to the condition, if confirmed, this finding "is of great public health importance," concluded Larsson.
Replace certain fats with olive oil
But like all other superfoods, increasing your olive oil intake alone won't be enough to protect you against heart disease and Alzheimer's.
It also remains to be seen what it is about olive oil specifically that provides that benefit. Continued research can help unearth more information about this link, added Larsson.
Cohen believes that the main takeaway from the study is that it's good to reduce the amount of saturated and trans fats in your diet. She also recommends consuming more unprocessed foods rich in monounsaturated fats, such as avocados, nuts, seeds and olive oil.
Watch the video below to know how to tell real from fake olive oil.
This video is from the Natural Remedies channel on Brighteon.com.
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