|
Ask The Doctor
Q. Which is more important in preventing heart attacks, diet
or exercise?
A: Future studies are likely to show that exercise may
be more important. A study in the medical journal Epidemiology (September
2002) reports that exercise lowers a blood test called C-Reactive
Protein (CRP). Many researchers believe that CRP is a more dependable
predictor of heart attacks than blood cholesterol levels (New England
Journal of Medicine, November 14, 2002). CRP is a measure of inflammation,
a swelling in the body that usually is caused by infection. A current
theory is that you get an infection with a bacteria or virus, which
raises blood levels of CRP and causes swelling and damage to the
linings of your arteries. This causes cholesterol to deposit into
the linings of arteries to form plaques that slow the flow of blood.
Then the infection causes clots to form that completely block the
arteries to cause a heart attack. How could exercise prevent heart
attacks
by lowering CRP? Nobody knows yet, but perhaps the vigorous flow
of blood cleans arteries, sweeps bacteria from their inner linings
and prevents inflammation. Vigorous exercise cannot hurt a healthy
heart, but check with your doctor because it could cause a heart
attack if your heart is already damaged.
|