Blueberries A Prescription For A Healthy Heart

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Thinking about topping your morning cereal with a cup of blueberries? Do it.

Just one cup of blueberries per day could be the key to reducing blood pressure and arterial stiffness, both of which are associated with cardiovascular disease, according to researchers at Florida State University (FSU).

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

The study is published in the Journal of the Academy of Nutrition and Dietetics.

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

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

Healthier arteries

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.

In addition to this the researchers 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 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.

Superfruits

Blueberries have been championed for their high antioxidant potential and anti-inflammatory properties. They’re low in caolires high in fiber, vitamin C, and manganese. Previous studies have shown that including high antioxidant fruits, rich in anthocyanins,  like blueberries and strawberries is heart healthy for older women.

Blueberries specifically have been shown to have positive effects on cardiovascular risk factors including blood pressure, but they all included large amounts of blueberry powder consumption, anywhere from 50 to 250g. 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.

This new data suggests that mega doses may not be necessary to produce healthful changes.

“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.”

Johnson says 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, in other groups as well as in postmenopausal women.

Source: www.nyrnaturalnews.com

2015-01-14T12:16:40+00:00

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