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Cardiovascular disease is the number one cause of death worldwide, claiming the lives of more than 17 million people every year. A recent meta-analysis and systematic review suggests that quercetin may exert protective effects to reduce the risk of cardiovascular disease.

Quercetin is a flavonol compound found in a wide variety of fruits and vegetables, including onions, apples, tea, and lettuce. Epidemiological data suggest that quercetin exerts protective effects against cardiovascular diseases, cancer, and other chronic diseases due to its anti-inflammatory actions.

The analysis investigated the effects of quercetin intake on several risk factors for cardiovascular disease, including lipid profiles, blood pressure, and glucose levels. It was based on findings from 17 randomized controlled trials involving nearly 900 participants who took a standardized quercetin extract.

The results of the analysis indicated that quercetin intake reduced systolic and diastolic blood pressures by approximately 3.09 mmHg and 2.86 mmHg, respectively. Quercetin intake did not appear to influence blood lipid profiles or glucose levels. However, a sub-group analysis demonstrated that longer trials of quercetin intake (8 weeks or more) had favorable effects on participants' HDL cholesterol and triglyceride levels.

These findings suggest that quercetin may be useful in the clinical setting for the management of risk factors associated with cardiovascular disease.

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