Mediterranean Diet Linked to Significantly Lower Stroke Risk, landmark Study Finds
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A diet rich in olive oil, nuts, and seafood may dramatically reduce the risk of all types of stroke, with some evidence suggesting a reduction of up to 25%, according to a comprehensive study spanning two decades.
A large-scale inquiry, published in neurology open Access, reveals a strong association between adherence to a Mediterranean diet and a decreased incidence of both ischemic and hemorrhagic stroke – the two most common forms of this life-threatening condition. While the study demonstrates a correlation, researchers emphasize it does not definitively prove causation.
Globally, stroke represents a devastating health crisis, impacting over 15 million individuals annually, resulting in 5 million deaths and leaving another 5 million with permanent disabilities. The new findings offer a possibly powerful, preventative strategy.
Unpacking the Protective Effects
The research, led by teams from the United States and Greece, examined the dietary habits of 105,614 women in California over an average of 21 years. Participants, all without a prior history of stroke and with an average age of 53 at the study’s outset, were scored based on their adherence to the Mediterranean dietary pattern.
Points were awarded for high consumption of wholegrain cereals, fruits, vegetables, legumes, olive oil, and fish, and also moderate alcohol intake. Conversely, points were deducted for higher consumption of red meat and dairy products. Participants were categorized into groups ranging from a score of zero to nine,reflecting their level of adherence.
After accounting for established stroke risk factors like smoking,physical activity,and high blood pressure,the study revealed compelling results. Women in the highest adherence group were 18% less likely to experience any type of stroke compared to those in the lowest adherence group. More specifically, they exhibited a 16% reduction in risk for ischemic stroke – caused by blocked blood flow to the brain – and a remarkable 25% reduction in risk for hemorrhagic stroke, which occurs due to bleeding within the brain.
A Critical Step Forward in Stroke Prevention
“Our findings support the mounting evidence that a healthy diet is critical to stroke prevention,” stated study author Sophia Wang, of City of Hope Comprehensive Cancer Centre in Duarte, California. “We were especially interested to see that this finding applies to hemorrhagic stroke, as few large studies have looked at this type of stroke.”
Experts not involved in the research have lauded the study’s importance. Juliet Bouverie, the chief executive of the Stroke Association, a charity, highlighted that nine out of ten strokes are preventable, underscoring the “huge potential” to reduce stroke incidence through lifestyle interventions.
“It’s long been known that eating a Mediterranean diet can definitely help to lower the risk of cardiovascular diseases, such as stroke,” Bouverie said. “We welcome how this has now been shown to reduce the risk of total, ischemic, and haemorrhagic strokes. Haemorrhagic strokes,while less frequent,are much more severe,so it’s reassuring that this study sheds light on this critical yet understudied subtype.”
Limitations and Future Research
Researchers acknowledge certain limitations to the study. The cohort consisted solely of women, and dietary data was self-reported, which may introduce some degree of inaccuracy. Despite these caveats,the findings are considered robust and warrant further investigation.
“Stroke is a leading cause of death and disability, so it’s exciting to think that improving our diets could lessen our risk for this devastating disease,” Wang concluded.”Further studies are needed to confirm these findings and to help us understand the mechanisms behind them so we could identify new ways to prevent stroke.”
