Potassium-Rich Foods May Cut Stroke, Heart Disease
FRIDAY, March 4 (HealthDay News) -- A diet rich in foods that
are loaded with potassium can reduce your risk for a stroke by 21
percent and may also lower your risk of heart disease, a new study
Good sources of potassium include bananas and other fruits and
vegetables, as well as fish, poultry and dairy, the researchers
And ounce per ounce, sweet potato and tomato paste top the list,
according to the U.S. Department of Agriculture.
"The average dietary potassium intake in most countries worldwide is much lower than recommended by health authorities, and increasing potassium intake may provide protection against stroke and other cardiovascular disorders," said lead researcher Dr. Pasquale Strazzullo, a professor of medicine at the Federico II University of Naples Medical School, in Italy.
The report is published in the March 1 online edition of the
Journal of the American College of Cardiology.
For the study, Strazzullo's team pulled data about potassium and
cardiovascular disease from 11 studies, which included a total of
247,510 men and women. The researchers looked at what people in
these studies recalled eating in the past day.
This process is called a meta-analysis, in which researchers
look for trends in the data that may support a particular
conclusion, even when these data were not the main point of the
They found that people who consumed 1.64 grams of potassium or
more a day had a 21 percent lower risk of stroke and also tended to
have a lower risk of any cardiovascular disease.
Strazzullo noted that five or more servings of fruits and
vegetables will provide the amount of potassium needed to get this
"The protective effect of potassium against the risk of stroke and other vascular events may in part be traced to its blood pressure-lowering effect, particularly in hypertensive individuals and in those with elevated sodium intake," Strazzullo said.
However, other processes appear to be at work as well, he added.
For example, potassium may be involved in slowing the process of
atherosclerosis and preventing the thickening of the walls of
arteries, all of which can lead to cardiovascular disease.
"More recently, a high-potassium diet was shown to exert a protective effect against the development of vascular damage induced by excess salt intake, thus counteracting, to some extent, the dangerous effects of eating too much salt. This large body of evidence from experimental studies provides biological plausibility to the protective effect of dietary potassium against cardiovascular events," Strazzullo said.
A higher potassium intake is safe for most people, Strazzullo
said, adding that there might be some concern about elevated
potassium for patients with kidney failure or those taking
medicines that lower potassium. In those cases, patients should
speak with their doctors, he added.
Dr. Larry B. Goldstein, director of the Duke Stroke Center at
Duke University Medical Center, commented that "this is completely
consistent with current American Heart Association dietary
The best example is the DASH-type eating plan, which has been
tested in various studies, he said. "The DASH diet is rich in
fruits and vegetables and nuts, moderate in low-fat dairy products,
low in sodium and high in potassium. The effect on stroke is likely
mediated, at least in part, through lower blood pressure,"
Another expert, Dr. Gregg Fonarow, spokesman for the American
Heart Association and professor of cardiology at the University of
California, Los Angeles, added that "clinical trials have
established that a diet high in potassium and low in sodium can
significantly lower blood pressure."
Because high blood pressure is one of the major risk factors for
heart disease and stroke, it follows that higher-potassium diets
would be linked to lower risk of stroke and heart attacks, he
"However, a higher-potassium diet potentially has other mechanisms of benefit, including protecting blood vessels from oxidative damage and limiting thickening of the blood vessel wall," Fonarow said.
Increasing potassium in the diet while limiting sodium may help
to reduce the risk of stroke and confer other cardiovascular
benefits, he said. "Fruits such as bananas, cantaloupe, grapefruit,
oranges, vegetables like tomatoes and low-fat dairy products are a
good source of dietary potassium," he said.
For more information on the best sources of potassium, visit the
U.S. National Library of Medicine.
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