Scientists blame genetics.
That's not a free pass to avoid physical activity, said lead author Katrina Drowatzky, a doctoral student at the university. Lack of exercise and obesity are other risk factors for coronary artery disease, as are smoking, diabetes and hypertension. Heart attack and stroke are then more likely. Standard cholesterol tests don't show this information, said Durstine, a researcher at the university's Norman J. Arnold School of Public Health. AP Wire Email newsletters Sign up to receive breaking news alerts, delivered to your inbox free whenever big news happens.