To Cut Diabetes Heart Risks, Diet and Exercise May Beat Drugs
More than 1 in 10 American
adults have diabetes, and many of them successfully keep their blood sugar
levels under control with various medications. Unfortunately, these
multibillion-dollar blockbuster drugs haven't proved to be so successful
against the biggest cause of death related to diabetes: heart disease. Four new
studies published in this week's New England Journal of Medicine bring nothing
but disappointing news for diabetics who rely on drugs to lower their risk of
heart attacks and strokes. One found that using antihypertensives to lower systolic
(the top number) blood pressure below a healthful measurement of 120 mm Hg does
nothing to lower a diabetic's risk of heart complications; another found no
benefit to adding a drug to raise HDL "good" cholesterol levels in
diabetics who were already taking a statin to lower the bad kind. And no heart
benefits were associated with two drugs given to lower high blood sugar levels,
according to the two other studies.
What all this new evidence
suggests is that more may not always be better when it comes to finding ways to
prevent heart disease in diabetics. "It's not enough to show that a drug
lowers high blood sugar levels or other risky biomarkers," says Steven
Nissen, chairman of the department of cardiovascular medicine at the Cleveland
Clinic, whose research linked the diabetes drug Avandia with an increased rate
of heart attacks. "Does it actually improve clinical outcomes? Does it
cause more benefits than risks?"
Evidence is accumulating that diabetics may not benefit-and may even be worse off when they're treated
with medications to drive down their blood sugar levels or blood pressure to
normal or below normal levels. The new study examining blood pressure found
that diabetics with moderately high blood pressure levels-about 135 mm Hg on
average-didn't benefit from taking extra blood pressure medication to lower
those levels down to slightly less than 120 mm Hg. In fact, they were more
likely than those who kept their levels in the 130s range to experience
fainting, heart arrhythmias, and abnormally high potassium levels, all
associated with low blood pressure. "Most doctors still aim for a goal
blood pressure of 130 or below when treating diabetics, even though no there's
no good data to support that," says study leader William Cushman, who is
chief of preventive medicine at the VA Medical Center in Memphis. Still, he
emphasizes, previous research has shown that diabetics can significantly lower
their risk of heart attacks and strokes by getting treated with high blood
pressure medications if they have systolic blood pressure above 140 or a
diastolic (lower number) pressure above 90.
The real take-home message
here is that those with diabetes shouldn't forget about the importance of
lifestyle factors even if they're already achieving optimal blood glucose
levels with medications. "We have an abundance of evidence," says
Cushman, losing excess weight, increasing activity levels, and improving
nutrition habits will lead to better control of diabetes and lower risks of
heart disease. Plus, lifestyle modifications pose none of the side effects or
long-term health risks that are associated with blood-sugar-lowering drugs. And
these changes appear to be more effective than drugs like metformin at
preventing diabetes from occurring in the first place in those who have
pre-diabetes or insulin resistance, according to David Nathan, director of the
diabetes Center at Massachusetts General Hospital, who wrote an editorial that
accompanied two of the NEJM studies.
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Here's a smart action plan:
1. Use drugs wisely. Those
with diabetes should take a cholesterol-lowering statin drug to lower their
heart-disease risks. They should take a blood pressure medication if they have
a level above 140/90 mm Hg to reduce heart disease risks but shouldn't aim to
achieve a level below 130 mm Hg for the systolic number, says Cushman.
Glucose-lowering medications like metformin should be used to achieve a
hemoglobin A1c level-a marker used to determine blood sugar control-of about
7.5 percent. "Personally," he adds, "I'm concerned about driving
levels below that with more medication because our previous research found a
higher mortality rate in those who had levels as low as 6 percent."
2. Think whole grains and
whole foods. Following good nutrition habits is one of the best ways to control
diabetes. You want to think high-quality carbohydrates like fruits, vegetables,
and whole grains rather than highly processed foods (chips, pasta, cookies)
that cause quick spikes in sugar levels. And you also want to include a lean
protein choice (fish, tofu, turkey, or chicken breast) and a small amount of
fat (nuts, olive oil, avocado) with every meal and snack to help slow digestion
and keep sugar levels on an even keel.
3. Try the create-a-plate
plan. Draw imaginary lines on your plate to divide it into three sections (two
small, one large), then put salad greens, broccoli, or other nonstarchy
vegetables onto the largest section of the plate; a small serving of starch
(baked potato, rice, whole-wheat pasta) in one of the smaller sections, and a
small serving of protein in the other.
4. Aim for modest weight
loss. Most folks don't need to lose 40 or 50 pounds to help reverse diabetes.
Just aiming for a 5 to 10 percent weight loss can make a huge difference in
helping to control blood sugar levels, according to the American Diabetes
5. Get moving, however, you
can. As with weight loss, you don't need to overdo it with the exercise to see
some benefits. The biggest payoffs, in fact, come to those who are sedentary
and simply get up and start walking around their neighborhood for 20 or 30
minutes a day says John Morley, who is the director of geriatrics at St. Louis
University. "I literally write my patients a prescription to lift 5-pound
weights in front of the TV or to always use the stairs instead of taking
elevators or escalators," he says. "Every time they come in for a
visit, I ask them if they're following my prescription, and I throw a tantrum
if they're not. They actually respond to that."
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