An article published online on July 21, 2010 in the Journal of Nutrition describes the outcome of a trial of obese men and women with metabolic syndrome which found a protective effect for blueberries against several cardiovascular disease risk factors. Metabolic syndrome is a group of factors that include reduced high-density lipoprotein (HDL) cholesterol, high triglyceride levels, hypertension, impaired glucose tolerance, abdominal obesity, and greater oxidative stress and inflammation. Having several of these risk factors increases the risk of developing cardiovascular disease and diabetes.
Researchers at Oklahoma State University randomized 4 men and 44 women to receive a beverage containing 50 grams freeze-dried blueberries (equivalent to 2.3 cups fresh blueberries) or an equivalent amount of water daily for 8 weeks. Weight, blood pressure, dietary assessments and blood sample analyses for various factors were conducted at the beginning of the study and at 4 and 8 weeks.
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