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Blueberries May Boost Heart Health

6/2/2014 9:45:01 AM

A pair of studies published in November 2013 shows that moderate blueberry consumption may improve vascular function in healthy people.

Two randomized, controlled, double-blind, crossover trials published in the American Journal of Clinical Nutrition in November 2013 investigated the impact of blueberry flavonoid intake on endothelial function in 21 healthy men.

Compared to the control subjects, researchers observed significant increases in FMD one to two hours after blueberry ingestion and then again at six hours.

In the first trial, the men were given either fruit or a drink with 766, 1,278 or 1,791 mg of total blueberry polyphenols. Subjects’ flow-mediated dilation (FMD) and polyphenol absorption was then assessed at baseline and one, two, four and six hours after blueberry consumption. Compared to the control subjects, researchers observed significant increases in FMD one to two hours after blueberry ingestion and then again at six hours. There were no significant differences, however, between each of the doses.

The second trial was an intake-dependence study measuring response between baseline and one hour after consumption of 319, 637, 766, 1,278 and 1,791 mg of blueberry polyphenols. Researchers discovered that FMD increased for doses up to 766 mg, but then plateaued. 766 mg is equivalent to 240 grams, or about 1 cup, of blueberries—an achievable daily consumption level for most people.

Source:
http://ajcn.nutrition.org/content/early/2013/09/04/ajcn.113.066639.abstract