Certified Dietary Manager (CDM) Practice Exam

What distinguishes high-density lipoprotein (HDL) as the "healthy" cholesterol?

1. It is present only in high quantities in the blood

2. It promotes cholesterol buildup in arteries

3. It helps to transport cholesterol to the liver

4. It is a byproduct of fat metabolism

The correct answer is: It helps to transport cholesterol to the liver

The distinction of high-density lipoprotein (HDL) as the "healthy" cholesterol primarily arises from its role in the body. HDL is known for its function in transporting cholesterol from the tissues and arteries back to the liver, where it can be processed and eliminated from the body. This process helps prevent the accumulation of cholesterol in the arteries, thereby reducing the risk of cardiovascular diseases. High HDL levels are generally associated with a lower risk of heart disease because of this protective role. It effectively works to clear excess cholesterol, contrasting with low-density lipoprotein (LDL), which tends to deposit cholesterol in the arteries. Thus, the ability of HDL to facilitate the removal of cholesterol from the bloodstream contributes to its designation as "healthy" cholesterol. Other options do not accurately represent HDL's function or characteristics. For instance, HDL is not solely defined by its quantity in the blood, nor does it promote cholesterol buildup; instead, it actively combats such buildup. Additionally, while HDL is related to fat metabolism, it is not merely a byproduct of this process; its primary and beneficial functions center around cholesterol transport and cardiovascular health.