Understanding Cholesterol and Lipoproteins

Cholesterol, Lipoproteins, and Heart Health: What You Might Not Know

Understanding the Deep Science — and the Real Risk Factors

Cholesterol is probably the most controversial topic I get into with my patients. This is because many of them have heard that cholesterol drugs (statins) cause cancer, damage the liver, deplete CoQ10, or don’t work, or are a waste of money.

How Arterial Plaque Forms

For arterial plaque to occur, there needs to be disruption of the endothelial layer (inner blood vessel wall). Then LDL particles find their way through the arterial wall and activate the immune system, causing inflammation. The immune system ingests these particles, and as the cells die, a lipid core develops. This can eventually rupture and cause a heart attack.
(Refer to Figure 1: Atherosclerosis timeline)

Understanding LDL Cholesterol

What Is LDL?

Low-density lipoprotein (LDL) is the “bad” cholesterol. While elevated LDL is a risk factor for heart attack, LDL alone is not a good predictor of an individual’s risk. More-sensitive cholesterol tests now look at particle size, number, and density.

Why LDL-P Matters

LDL particle number (LDL-P) is a stronger predictor of heart attack risk than standard LDL levels. Overlapping cholesterol levels between those with and without coronary artery disease (CAD) add to the confusion.

Example: The Framingham Heart Study

• 80% of heart attack patients had cholesterol levels similar to people without heart disease

• 50% had “normal” cholesterol

Takeaway on LDL:

• LDL is still a well-established risk factor

• It’s one piece of a bigger picture

Action Steps:

• Try diet and lifestyle changes first: aerobic exercise, reduce saturated fat, increase fiber and whole foods

• High-risk patients should aim for LDL < 70 mg/dL

• A whole-food Mediterranean-style diet with sodium < 2000 mg/day is ideal

Understanding Lipoproteins

What Are Lipoproteins?

Lipoproteins are particles that carry cholesterol in the blood. They vary in size and density. Smaller particles are more dangerous because they can more easily penetrate arterial walls.

LDL and HDL Are Not Enough

• Small, dense LDL particles increase risk even at normal cholesterol levels

• Most cholesterol circulates inside these lipoproteins

Apolipoproteins: The Traffic Controllers

• These proteins tell cholesterol where to go and how to behave

• Smaller particles = more total particles = higher risk

(Refer to Figures 2 and 3: Lipoprotein Subclasses and Particle Size/Number)

ApoLipoprotein-B (ApoB)

What Is ApoB?

ApoB is a protein that indicates the number of LDL particles. Some people have high particle counts even if their LDL cholesterol appears normal.

Why It Matters:

• ApoB is a better risk marker than LDL alone

• Testing is less expensive than other particle-count methods

• Goal: ApoB < 60 mg/dL if LDL < 70 mg/dL

Action Steps:

• Ask for an ApoB test during your next blood draw

• Lipoprotein testing may be covered by insurance

• Particularly important if your LDL is normal but you’re still building plaque

Understanding HDL: The Good Cholesterol

What Does HDL Do?

High-density lipoprotein (HDL) helps remove cholesterol from arteries and promotes repair of the vascular system.

Why HDL Is Crucial:

• Low HDL increases CAD risk

• Raising HDL may offer better outcomes than lowering LDL in some cases

Key Research Findings:

• CAD increases by 25–30% for every 10 mg/dL drop in HDL below 45 mg/dL

• People with HDL > 65 mg/dL have significantly lower risk

• HDL promotes arterial repair and has antioxidant properties

(Refer to citations: Castelli, Kannel, Norata & Catapano, Shah et al.)

Action Steps to Raise HDL:

Simple Lifestyle Changes:

• Exercise: 20–60 minutes daily, 5–6 days/week (duration matters more than intensity)

• Fat loss: Especially abdominal fat

• Supplements: Niacin (under medical supervision), Pantethine (900 mg)

• Manage insulin resistance aggressively

HDL Target:

• 60/60/60 Rule: LDL = 60, HDL ≥ 60, Triglycerides ≈ 60

Final Takeaway

Cholesterol is more than a single number. Particle size, density, and function matter. Lipoprotein testing — especially ApoB — offers a clearer, more accurate look at cardiovascular risk.

 Tags: #Cholesterol #HeartHealth #ApoB #HDL #PreventiveCardiology #Lipoproteins #RootCauseMedicine