Heart disease is a leading killer in the U.S.
It usually is not found until later in life.
New research could help young people change their behavior before it is too late.
People between 18 and 30, with elevated risk factors, are two to three times more likely to develop calcium deposits in the arteries, a usual predictor of heart disease.
Risk factors include smoking, high blood pressure, high cholesterol, and high blood sugar.
Coronary artery calcium was found more often in men than women.