Mediterranean Diet Better Than Low-Fat Diet in Keeping Aging Brains Sharp

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Thank the olive oil or the nuts, but something about the Mediterranean diet could help older brains act young again.

There’s plenty of evidence that the Mediterranean diet can contribute to a lower risk of heart attacks, stroke, childhood asthma and even cancer. In fact, in a recent study, researchers assessed about 200 traditional Greek Mediterranean foods and reported that taken together, the foods could make 1,024 relevant health claims.

(MORE: Mediterranean Diet Improves Memory, but Not in Diabetics)

And in May, a team of researchers at the University of Alabama at Birmingham and the University of Athens found that people around age 64 who primarily ate a Mediterranean diet had a lower risk of memory loss.

So perhaps it’s not that surprising that in the latest study, published in the Journal of Neurology, Neurosurgery and Psychiatry, researchers reported similar brain-boosting findings. Except this time, the results showed that the Mediterranean diet was significantly better than a low-fat diet in preserving brain function. The researchers, from the University of Navarra in Spain, studied 522 men and women between the ages of 55 and 80 who did not have heart disease, but were at a higher risk of having circulation-based events like a stroke because of diabetes or a combination of risk factors such as high blood pressure, a family history of stroke, or being overweight.

The participants were split into three diet groups: one consumed a Mediterranean diet with extra-virgin olive oil, another ate a Mediterranean diet supplemented with mixed nuts, and the control group was assigned a low-fat diet. The typical Mediterranean diet includes plenty of olive oil, fruits, vegetables, grains and fish, with moderate amounts of dairy and meat.

All of the participants agreed to complete extensive cognitive tests after about 6½ years, in which the researchers assessed their higher cognitive functions such as their language skills, their ability to orient themselves to time and place, their capacity for abstract thinking and their memory.

(MORE: It’s the Olive Oil: Mediterranean Diet Lowers Risk of Heart Attack and Stroke)

By the end of the study, 60 of the participants had developed mild cognitive impairments and 35 developed dementia. Among the participants with mild cognitive decline, 18 consumed the diet with added olive oil, 19 had eaten the diet with additional nuts, and 23 were assigned the low-fat diet. Among the dementia patients, 12 were on the diet with added olive oil, six on the version with added nuts, and 17 were on the low-fat diet.

The cognitive-function tests showed that on average, those consuming either version of the Mediterranean diet scored significantly higher than the low-fat dieters. Because the participants were Spanish men and women, it’s possible that other lifestyle or cultural factors played a role in the results. But even after adjusting for factors such as age, family history of cognitive problems and dementia, education and even depression, which can affect cognitive function, the beneficial effect of the Mediterranean diet remained.

Many studies have linked the diet to health improvements, and researchers are starting to pin down some of the factors that could be driving these effects. In this study, the researchers noted that the Mediterranean diet groups might have exploited the high levels of antioxidants and anti-inflammatory agents in the foods.

“Oxidative stress has been associated with neurodegeneration. The main components of the [Mediterranean-diet] intervention in the … trial, extra-virgin olive oil and nuts, have antioxidant properties and, together with other polyphenol-rich foods in the [Mediterranean diet], are suggested to relate to improved cognitive function,” the authors wrote in the study. They also suggested that the beneficial effects of the Mediterranean diet come from improvements in underlying risk factors that otherwise could contribute to strokes or other related health problems.

(MORE: Mediterranean Diet Linked to Lower Child-Asthma Risk)

The study involved a small number of participants, and the volunteers were at higher risk of developing heart or vascular issues, but it did follow them for an extended period of time. So it’s not clear whether the same benefits would hold for the general population, but the researchers say the findings strengthen the link between diet and cognitive function. So far, other studies are also finding similar benefits among Americans favoring the Mediterranean diet, but more studies are needed to assess whether the effects of the diet are universal. If they support these results, however, olive oil and nuts could become useful weapons in holding off age-related cognitive decline.

12 comments
MickeyCashen
MickeyCashen

biologik, I spent a lot of time at the National Institutes of Health in the D.C. suburbs in Maryland while cowriting the Nutrition Science Course curriculum in my county, centered on Annapolis.  The research by the late 90's - and beyond as gathered in the Harvard Medical School Guide to Healthy Eating, etc.- indicates that a low-fat (below 15%) diet is NOT as healthy in the long run as one that's closer to 25%.  There are aspects of olive oil that are healthy that apparently include sheathing neurons and help memory, make arteries more elastic, and reduce LDL cholesterol.  But most of this should be labeled "preliminary research: subject to change."

biologik
biologik

Olive oil is NOT healthy.  It is the lesser evil when compared to butter, lard, and margarine.


Low-fat, high carb, plant based diets beat all others in preventing Alz-heimers, diabetes, and heart disease, and has even been shown to reverse these diseases in randomized, controlled trials.

The article mentions a study that compares a high fat olive oil diet to a low fat one, yet i don't see any study cited.  Usually, the "low fat" group in these studies consist of a diet with over 25% fat of total energy consumed.  That is far from low fat.  A real low fat diet is below 15% fat in total energy consumption.


Bogus article.


mkb
mkb

Carbohydrates, Fats, Proteins make a complete energy rich diet. What proportions one needs in their routine diet depends on their occupation, their build and many more factors. An athlete need more energy foods, a sedentary person can survive with small calories. 

How people live longer is not yet demystified. Physical performance provides a stimulus for work(Physical) and work provides good muscles, good muscles and work keep the vital organs well oiled. any derailment of working shotrten ones life drastically.

For long life on should work hard and walk for long distance.

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Walking provides mechanical stimulus to the body, walking increase the muscle bulk and help to sustain the good health

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MarcHandler1
MarcHandler1

What kinds of nuts? How much olive oil?  If you test the general population of Greeks who eat these kinds of diets, are they more mentally alert than people in other parts of the world? Is dementia less prevalent in Greece? It would be helpful if Ms. Sifferlin would include a little more information here.  

mikeylikeychiptole
mikeylikeychiptole

@biologik  Olive oil in moderation is incredibly good for you.  It's been proven time and time again.  Do some research and you'll see.  I've never seen anything anywhere that says otherwise.  Thinking all fats are bad for you is incredibly outdated.