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Nutrition, Vitamins & Supplements for Seniors

Older women see blood pressure drop from eating blueberries daily

Artery stiffness and blood pressure reduced more than five percent

Blue berriesJan. 14, 2015 – Older women should definitely consider consuming a cup of blueberries a day, according to a Florida State study that finds this will lower blood pressure and reduce stiffness of arteries – both linked to cardiovascular disease.

“Our findings suggest that regular consumption of blueberries could potentially delay the progression of prehypertension to hypertension, therefore reducing cardiovascular disease risk,” said Sarah A. Johnson, assistant director of the Center for Advancing Exercise and Nutrition Research on Aging (CAENRA) and postdoctoral fellow in the Department of Nutrition, Food and Exercise Sciences at Florida State University.

Johnson and a team of FSU nutrition and exercise scientists are the authors of a new paper, “Daily blueberry consumption improves blood pressure and arterial stiffness in postmenopausal women with pre- and stage 1-hypertension.”

The report on their work is found in the Journal of the Academy of Nutrition and Dietetics.

Johnson said she is interested in looking at how functional foods - foods that have a positive impact on health beyond basic nutrition - can prevent and reverse negative health outcomes, particularly for postmenopausal women.

 

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“Cardiovascular disease is the leading cause of death in the United States,” she said. “Once women go through menopause, this puts them at an even greater risk for it. Our findings suggest that the addition of a single food, blueberries, to the diet may mitigate the negative cardiovascular effects that often occur as a result of menopause.”

Over an eight-week period, 48 postmenopausal women with pre- and stage-1 hypertension were randomly assigned to receive either 22 grams of freeze-dried blueberry powder — the equivalent to one cup of fresh blueberries — or 22 grams of a placebo powder. Participants, meanwhile, continued their normal diet and exercise routines.

At the beginning of the study, the team took participants’ blood pressure and measured their arterial stiffness and select blood biomarkers.

At the end of the eight weeks, participants receiving the blueberry powder on average had a 7 mmHg (5.1 percent) decrease in systolic blood pressure, which is the top number in the blood pressure reading that measures the pressure in the arteries when the heart beats.

They also saw a 5 mmHg (6.3 percent) reduction in diastolic blood pressure, or the bottom number measuring the pressure in the arteries between heartbeats.

Additionally, participants in the blueberry-treated group had an average reduction of 97 cm/second (6.5 percent) in arterial stiffness.

They also found that nitric oxide, a blood biomarker known to be involved in the widening of blood vessels, increased by 68.5 percent. That is important, Johnson said, because arterial stiffness and the narrowing of blood vessels are both a part of hypertension. This rise in nitric oxide helps explain the reductions in blood pressure.

Previous studies on blueberries have shown positive effects on cardiovascular risk factors including blood pressure, but they all included large amounts of blueberry powder consumption, anywhere from 50 grams to 250 grams. In the case of 250 grams, that would translate to more than 11 cups of fresh blueberries, which may not be realistic for people to consume on a regular basis.

Johnson said that future studies will consider other dosages of blueberries, longer intervention periods and other sample populations.

Johnson is joined on the paper by Department of Nutrition, Food and Exercise Sciences professors Bahram H. Arjmandi and Arturo Figueroa; Campus Recreation Wellness Coordinator Lauren T. Ormsbee; Oklahoma State University Department of Statistics Department Head and Professor Mark E. Payton; and San Diego State University School of Exercise and Nutritional Sciences Professor Shirin Hooshmand. Florida State University graduate students Negin Navaei, Alexei Wong, Roy Kalfon, Rafaela G. Feresin and Marcus L. Elam also contributed.

The research was funded by the U.S. Highbush Blueberry Council (USHBC).

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