A study published in the Archives of Biochemistry and Biophysics shows that ellagitannins — natural phenolic compounds found in red raspberries — may improve vascular function in healthy men.
“The aim of our work was to investigate whether raspberry consumption can improve vascular function and to understand which phenolic metabolites may be responsible for the effects.”
In a randomized controlled trial, Dr. Rodriguez-Mateos and co-authors gave 10 healthy male subjects, aged 18 to 35, drinks prepared with 200 g and 400 g of frozen raspberries containing 201 or 403 mg of total polyphenols, or a matched control drink in terms of macro and micronutrient content, color, and taste.
The researchers investigated the vascular effects of the subjects at baseline, 2 hours-post consumption and 24 hours-post consumption of the raspberry and control test drinks.
The participants consuming the red raspberry drink showed improved flow-mediated dilation (FMD), an established biomarker of cardiovascular disease risk.
FMD increased significantly at 2 hours post-consumption of the raspberry drink when compared with the change in FMD due to the control drink, and this maintained at 24 hours after consumption.
At 2 hours post-consumption of both raspberry drinks, ellagic acid, found in plasma and urine correlated with FMD.
At 24 hours post-consumption of the 200 g raspberry drink, urolithin-A-3-glucuronide and urolithin-A-sulfate correlated with FMD.
No significant differences were found between FMD improvements after consumption of the 200 g and 400 g raspberry drinks.
“The study suggests that ellagitannins may play a role in driving the positive effects seen on blood vessel function in the study’s participants,” Dr. Rodriguez-Mateos said.
“We’re excited about these findings and what they may potentially add to the growing list of benefits from consuming red raspberries,” added Dr. Tom Krugman, executive director of the National Processed Raspberry Council, who was not involved in the study.
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