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Blueberries improve blood pressure and immunity
Blueberries contain powerful antioxidants that help boost the immune response to viruses and tumors. In this study, 25 men and postmenopausal women took a blueberry powder supplement equal to about 8.8 ounces of fresh blueberries per day, or a placebo.

After six weeks, while there was no improvement for placebo, the blueberry group saw a 4 percent increase in immune response, more flexible arteries, and lower systolic blood pressure. In a sub-group of blueberry users with slightly elevated blood pressure, diastolic blood pressure also decreased.

Reference: Nutrition Research Journal; July 2014 Volume 34, Issue 7, Pages 577–584.
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