How onions reduce blood pressure

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A recent review and meta-analysis have investigated whether a plant pigment called quercetin could reduce the risk of cardiovascular disease. In particular, the authors identified that quercetin reduced blood pressure.

A compound that occurs naturally in a range of fruits and vegetables, including red onion, may help reduce blood pressure.

Globally, cardiovascular disease is responsible for about 17.3 million deaths each year. As the population’s average age increases, experts expect cardiovascular disease to rise in step.

Researchers have identified a range of lifestyle factors that increase the risk of cardiovascular disease, such as poor diet, low physical activity, smoking, and consuming alcohol. Certain biological markers, including high blood pressure, raised serum lipids, and high blood glucose levels, also predict cardiovascular disease.

Although lifestyle and medical interventions benefit most individuals, they do not work for everyone. For this reason, some researchers are focused on identifying novel ways to reduce cardiovascular risk.
Introducing quercetin

Researchers from Dongguan Shilong People’s Hospital of Southern Medical University in China are interested in quercetin. Quercetin is a flavonoid that naturally occurs in a range of foods, including vegetables, fruits; wine, nuts, red onions, kale, and black tea.

According to the authors of the recent review, “Accumulating evidence indicates that quercetin possesses protective anti-inflammatory as well as antioxidant effects and may be useful in treating a myriad of chronic conditions.”

However, despite some encouraging results, human studies — rather than animal studies or experiments on tissues — have produced inconsistent results. To date, researchers have carried out few meta-analyses to examine the pooled findings of these studies.