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Berries show heart boosting power for women: Harvard study

By Stephen DANIELLS , 14-Jan-2013
Last updated on 14-Jan-2013 at 23:17 GMT2013-01-14T23:17:35Z

Berries show heart boosting power for women: Harvard study

Three or more servings of blueberries and strawberries per week may slash a woman’s risk of a heart attack by as much as 33%, says a new study from Harvard.

Data from 93,600 women aged between 25 and 42 indicated that the highest consumption of the blueberries and strawberries was associated with a one-third reduction in their risk of heart attack, compared to eating berries once a month or less – even in women who otherwise ate a diet rich in other fruits and vegetables.

Writing in Circulation: Journal of the American Heart Association, the researchers attributed the benefits to the anthocyanin content of the berries, which may help dilate arteries, counter the buildup of plaque and provide other cardiovascular benefits.

"Blueberries and strawberries can easily be incorporated into what women eat every week," said Harvard School of Public Health’s Eric Rimm D.Sc., senior author of the study. "This simple dietary change could have a significant impact on prevention efforts."

This is not the first time that berries and the compounds they contain have been linked to cardiovascular benefits. Anthocyanins, a class of secondary plant metabolites called flavonoids, are found in many fruits and berries. 

Scientists from East Anglia recently reported that increased intakes of anthocyanins may reduce blood vessel hardening and improve overall heart health

“These results are of public health importance because intakes of flavonoids associated with these findings are easily achievable in the habitual diet and make a significant contribution to the knowledge base needed to refine the current, rather general, fruit and vegetable dietary recommendations,” wrote the researchers in the American Journal of Clinical Nutrition .

In addition, a recent study from China indicated that 320 milligrams per day of anthocyanins for 24 weeks was associated with reductions in inflammatory compounds like C-reactive protein (CRP) and soluble vascular cell adhesion molecule-1 (sVCAM-1) of 22% and 12%, respectively.  

Study details

Working with scientists from the University of East Anglia in the UK, the Harvard scientists analyzed data from 93,600 women participating in the Nurses' Health Study II. Dietary data was obtained every four years via questionnaires.

During the study, the researchers documented 405 heart attacks. After crunching the numbers, Dr Rimm and his co-workers calculated that the highest intakes of blueberries and strawberries were associated with a significant reduction in heart attack risk.

"We have shown that even at an early age, eating more of these fruits may reduce risk of a heart attack later in life," added Aedín Cassidy, PhD, from the University of East Anglia.

The American Heart Association said it supports eating berries as part of an overall balanced diet that also includes other fruits, vegetables and whole-grain products.

Commenting independently on the study’s findings, Victoria Taylor, senior dietitian at the British Heart Foundation, a charity, said that more research is needed to understand why this link between berries and better heart health exists.

“We would need to know more before we make specific recommendations about individual fruit and vegetables in relation to heart disease,” she said.

“But in the meantime, this is yet another good reason to make sure we get our five-a-day and enjoy the wide variety of fruit and vegetables available to us.”

Source: Circulation
Volume 127, Pages 188-196, doi:10.1161/CIRCULATIONAHA.112.122408
“High Anthocyanin Intake Is Associated With a Reduced Risk of Myocardial Infarction in Young and Middle-Aged Women”
Authors: A. Cassidy, K.J. Mukamal, L.Liu, M. Franz, A.H. Eliassen, E.B. Rimm

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