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December 10, 1999
News this month
Healthy habits slash heart disease risk
A new study presented at the American Heart Association meeting
in Atlanta early in November suggests people who follow several
of the known steps to prevent heart disease benefit more than previously
thought. In fact, a healthy lifestyle reduced the risk of heart
attack, congestive heart failure and stroke by 82 percent.
A healthy lifestyle reduced the risk of heart attack, congestive heart failure and stroke by 82%.
Nurses Health Study
The study was conducted by researchers at the Harvard School of Public Health and Brigham and Womens Hospital who surveyed 84,129 women
health professionals enrolled in the Nurses Health Study. The
women were asked about their eating habits and lifestyle twice a year over a 14-year period. At baseline, the women, who ranged between
34 and 59 years old, were free of heart disease.
Dr. Frank B. Hu, assistant professor of nutrition at the Harvard School
of Public Health, who presented the study, reported 1,129 cases of
heart disease among this group.There were 296 fatal heart attacks
and 833 nonfatal heart attacks.
About half of the heart attacks occurred in current smokers. Women who had the lowest risk were:
- nonsmokers;
- maintained a healthy weight for their height;
- exercised moderately or vigorously for a half hour or more a day;
- ate foods low in fat and high in fiber;
- and drank about 4 ounces of alcohol per day.
Lifestyle habits make all the difference
"Heart disease is a disease of lifestyle," said Dr. Hu.
"While genes can play a role in early heart attacks, they largely
result from unhealthy living habits." He speculated that the
effects of diet and exercise on heart disease could potentially be
even greater in individuals who lowered fat intake and increased the
amount of fruit and vegetables in their diet even more than the women
in the lowest risk category in the Nurses Health Study who followed
guidelines for moderate risk reduction.
Though the women in the study were nurses or other health professionals,
no more than 2 percent followed all the heart-health guidelines. The
low compliance rate surprised the researchers.
Being less than perfect is better than making no
attempt at healthy living.
While following all the rules is best, it is clearly difficult for
most people. Being less than perfect is better than making no attempt
at healthy living, according to Hu. Getting enough exercise and keeping
weight off were areas where the nurses most often failed. Only 20
percent reported getting an hour or more of vigorous exercise weekly. Sixty percent were overweight.
"In practice," says Rodney Starke of the American Heart
Association, "everybody's looking for the magic bullet that takes
you off the hook for the regular, constant tough attention to behavior
that lowers your risk of heart disease. There is no substitute."
Dr. Richard Pasternak of Massachusetts General Hospital said the research
is important because it suggests that controlling heart disease is
possible without any new technology or discoveries. "There is
a good chance that we could wipe out this epidemic if we do everything
we already know about," he said.
These lifestyle changes give people the opportunity to extend heart disease-free life through their productive yearsthe 50s, 60s and 70s.
Men would benefit as well
"Although this study involved women, we think that it
can be extrapolated to men as well," Hu said. "The largest
single lifestyle change is smoking, which could reduce the risk of
heart disease as much as 40 percent."
"These lifestyle changes give people the opportunity to extend
heart disease-free life through their productive yearsthe 50s,
60s and 70s. We do not believe that extreme diets or exercise programs
are required to achieve this."
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Healthy lifestyle choices reap rewards
This recent report from the annual American Heart Association meeting underscores the
important relationship between lifestyle choices and heart disease
risks. We have known about the role of smoking, food choices, exercise
and obesity in heart disease for some time, but this study shows
the dramatic reduction in risk82 percenteven moderate
changes can make. Meir Stampfer, Frank Hu and their colleagues focused
on five diet and lifestyle risk factors: smoking, body mass index,
diet, exercise and alcohol consumption.
"The most dramatic finding in this study to me is the very high incidence of heart disease among smokers."
Stop smoking
The most dramatic finding in this study to me is the very high incidence
of heart disease among smokers. About 50 percent of the 1,129 documented
cases of heart disease were found to be among women who were current
smokers. All of the lifestyle factors this group considered are important,
but clearly, stopping smoking is head and shoulders above the others.
If none of the other low risk behaviors were considered, nonsmokers
enjoyed a 74 percent reduction in risk.
I see patients in our practice with heart disease in their 30s whose
only risk factor is smoking. My overall recommendation would be to
stop "cold turkey" as soon as you can, but anyone who has
tried to quit understands it is not an easy task. Fortunately, there
are some new medications that are proving helpful for some patients.
Originally developed for depression, bupropion hydrocloride (sold
as Zyban and Wellbutrin) is a prescription medication
that reduces the urge to smoke among many people. Some long-time smokers
are finding it possible to stop with the help of bupropion HCI combined
with some of the nicotine patch or gum products.
Healthy weight
Maintaining a healthy weight for ones height is also very important.
Even among this study population comprised of health care professionals,
obesity and lack of exercise were the two factors they were least
likely to manage well. The study used a body mass index (BMI) of 25
or lower as the criteria for low risk. You can calculate your BMI
by dividing your weight (in kilograms) by your height (in meters)
squared.
[Go to HealthStatus.com to determine your own BMI.]
Losing weight isnt easy, and many people think a new diet drug
or fad diet is the magic bullet to permanent weight loss. It seldom
is. I am a strong advocate of reducing the amount of calories you
eat and increasing physical activity to achieve slow, consistent weight
loss.
"Exercise is a fundamental component of weight management, and it also contributes to cardiovascular health
"
Exercise
Exercise is a fundamental component of weight management, and it also
contributes to cardiovascular health, reducing blood pressure and
improving circulation. The researchers in this study categorized women
who exercised for 30 minutes or more a day either moderately or vigorously
as low risk. If its unrealistic to exercise every day, a minimum
of three days a week for 30 minutes provides some benefit.
What you should eat
What you eat may be as important as how much you eat. Those at low
risk for developing heart disease in the Nurses Health Study
were those whose diet included:
- a high percentage
of cereal fiber;
- omega 3 fatty
acids, found in such foods as salmon and tuna;
- folate, found
in such foods as spinach, asparagus, brussel sprouts and orange
juice; and
- polyunsaturated
fats such as vegetable oils.
The American Heart Association recommends individuals reduce their total fat intake to
no more 30 percent of total calories and reduce cholesterol intake
to less than 300 milligrams per day.
[For detailed information about AHA nutritional guidelines, visit YNHHs cardiac services diet section].
Wine for your heart
The fifth factor considered in the study is alcohol consumption. Low-risk
women had an average of one half drink or more per day of an alcoholic
beverage. I suggest to my patients who currently drink alcohol to
consider red wine as an alternative to whatever they may be currently
drinking.
Numerous studies have attributed the protective effects of alcohol
consumption to an increase in HDL ("good") cholesterol levels.
In addition, laboratory analyses found both red wine and grape juice
to be especially high in two flavonoids, quercetin and rutin, which
reduce the stickiness of blood platelets, increasing blood flow.
Since some people may not tolerate alcohol well, I do not recommend
anyone begin drinking to minimize their risk of heart disease. The
other four factorsquitting smoking, maintaining a healthy weight,
exercising and eating healthfully are more important.
This study is important on several levels. It points out that huge
benefits can be gained by only moderate changes. We dont need
to become vegetarians or marathon runners to protect our health. Consistent,
moderate lifestyle changes can make a difference in protecting yourself
from a disease that affects nearly 60 million Americans.
Dr. Freed is a cardiologist and an associate with The Cardiology Group with offices in New Haven and Branford. She is an attending physician at Yale-New Haven Hospital.
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