Millions of Americans have coronary artery disease caused by plaque buildup in their blood vessels. But once heart disease starts, can the damage be undone?

"Studies have shown you can reverse this narrowing of the arteries to the heart," says Dr. Stephen Kopecky, a Mayo Clinic cardiologist.

So what can you do to make your heart healthier than it is today? The answer is in this week's Mayo Clinic Q&A podcast.