Olive oil, a typical component of the Mediterranean diet, has a protective effect on the cardiovascular system mostly because of its high polyphenol content. In addition to olive oil, the olive leaf extract (OLE) could also possess cardioprotective qualities due to its high oleuropein content, which is significantly higher than in olive or olive oil. In a systematic review and a meta-analysis that evaluated the effect of OLE supplementation on the cardiovascular system, it was noted that interventions using OLE reduced triglyceride levels and systolic blood pressure in adults. Moreover, the authors found that OLE supplementation might also improve triglyceride levels, total cholesterol, LDL- colesterol, systolic blood pressure and diastolic blood pressure more significantly in people with hypertension and normal body weight. Still, they found no significant differences in glucose levels, liver and kidney variables and inflammation markers.
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