(GETTY IMAGES)Yes, youve heard of cholesterol, and you may even take a pill for it. But how much do you know? When youre faced with confusing numbers on a lab report, its hard to remember: Is cholesterol good? Or bad? And how much should I care? The answer is, its both good and bad. The more you find out about this waxy substance, and how to eat and exercise to keep it under control, the lower your chances of having health problems.