What Puts You at Risk for High Cholesterol?

Blood cholesterol is a risk factor for coronary artery disease and heart attack, so reducing your risk of high cholesterol is a worthy goal. However, the next time you brag that your cholesterol is nice and low—or lament that your number is in the mid-200s—know this: "Your total cholesterol is a pretty meaningless number," says Maureen Mays, MD, a preventive cardiologist and lipid specialist at Oregon Health & Science University in Portland. "Not only does the general public not know this, some doctors don't either."

Here's why "the number" is so misleading. Total cholesterol is calculated by adding LDL (bad cholesterol), HDL (good cholesterol), and one-fifth of your triglyceride total. "We have been using this formula of adding a bad thing to a good thing and factoring in one-fifth of a bad thing, and it's not useful," Dr. Mays says.

That's one reason 50% of people who have a heart attack have normal cholesterol readings.