New Culprit Found to Cause Heart Disease     Hello and welcome to Your Health. I'm Dr. Steve Salvatore. You probably know about the risks of high cholesterol and how it can to heart disease, even heart attacks and strokes. But a new study shows that elevated triglycerides may sharply increase a person's risk of dying from a heart attack, even if that person has normal cholesterol levels. Researchers say these findings offer more evidence of the importance of both cholesterol and triglycerides.