The LDL Debate Is Asking the Wrong Question

A DEEP DIVE INTO THE REAL REASON ATHEROSCLEROSIS HAPPENS WHERE IT DOES, WHY YOUR CHOLESTEROL NUMBER IS ONLY HALF THE STORY, AND WHAT TO DO ABOUT IT

You've probably heard the argument. Maybe from a podcast, a YouTube video, or a friend who went carnivore and lost 40 pounds and now has opinions about lipids. It goes something like this:

"LDL doesn't actually cause heart disease on its own. You need other factors like inflammation, insulin resistance, oxidized LDL. If your metabolic health is good, your LDL doesn't matter."

It's a compelling argument, and it's often delivered confidently by people with impressive credentials and large followings. And i'm hearing it in my practice regularly now, from patients who are declining statins, abandoning plant-rich diets for carnivore and keto, or eating ribeyes daily because they heard their "pattern A" LDL is fine as long as their triglycerides are low and their insulin is good.

But here's the problem: the argument is built on a flawed question.

The question "does LDL cause atherosclerosis on its own, or does it require cofactors?" is recurrently presented on social media as an unsettled scientific debate. But when you understand what's actually happening inside your arteries, at the specific anatomical locations where plaques form, in the specific biological environment that exists there, you realize this question can never be answered, because the condition it's asking about doesn't exist in a living human body.

Now let me explain what I mean. And then I want to introduce you to an analogy I use with all my patients that I hope will help you think about your heart health forever.

The Two Things That Actually Determine Your Plaque Burden

Atherosclerosis, the process of plaque buildup in your arteries, is primarily driven by two interacting variables. Not one. Two.

Variable 1: How much apoB-containing lipoprotein is circulating in your blood and for how long.

ApoB is the protein that wraps around non-HDL, cholesterol-carrying particles (LDL, VLDL, IDL, and Lp(a), and they all carry exactly one. Think of each lipoprotein as a cargo ship, with apoB as the hull, or the structural shell that holds everything together. And cholesterol? It's actually less like the cargo some portray it to be, and more like the rivets and structural material that help build the ship itself. In other words, contrary to popular narratives, most of the cholesterol inside a lipoprotein particle is structural, not material being transported for delivery to tissues. The key point also is that every single one of these ships has exactly one apoB hull, which is why counting apoB tells you exactly how many ships are in your bloodstream. And so, the more ships you have circulating, the more of them may end up entering the lining of your arteries and, most importantly, getting stuck there. It's that process of getting stuck, what scientists call "retention", that kicks off the entire atherosclerotic cascade. Once a lipoprotein particle gets retained in your arterial wall, the downstream sequence of oxidation, immune activation, foam cell formation, and plaque development inside the lining becomes effectively inevitable. The questions then become how fast and how severely it progresses, and how the stable or not the result lesion is, and that's where variable # 2 comes in.

Variable 2: How permissive your local vascular environment is.

The lining of your arteries, ie your endothelium, produces a molecule called nitric oxide (NO) through an enzyme called eNOS. Nitric oxide is not just about vessel dilation and blood pressure. It's your arterial wall's primary defense mechanism against the atherogenic process. It can help protect retained LDL from oxidation, dampen inflammation, and keep your vascular environment less conducive to plaque development overall. When your NO production is robust, your arterial wall can be relatively resistant to the cascase of events I described, even when lipoproteins do get retained. But when your NO production is depleted by things like and unhealthy diet, high blood pressure, insulin resistance, smoking, aging, elevated Lp(a), and other factors, your arterial wall becomes a far more permissive environment for plaque to develop rapidly.

So: more lipoproteins entering the wall (Variable 1) combined with a more permissive local environment (Variable 2) equals more atherosclerosis. Less of either = less disease. It's the interaction of both that matters most.

This is exactly why you can hear about examples of people with high LDL and minimal plaque, or people with low LDL but significant plaque. Neither observation disproves LDL's role. It just means both variables are always in play simultaneously.

The Part Almost No 'Expert' on Social Media Talks About: Bifurcations

Here's where the "LDL alone hasn't been proven to cause plaque" argument completely falls apart.

Your arteries are not a uniform tube. They branch and twist and turn, sometimes sharply, with branch points being most important here. At every branch point, what are technically called arterial bifurcations, something very specific happens to blood flow. It becomes turbulent and oscillatory, like eddys in a river, rather than smooth and laminar like the center of a straight flowing river. Very importantly, that turbulence chronically suppresses the very signaling pathways that keep your endothelium healthy and producing nitric oxide.

In everyone.

The key point is that this is not a pathological process. It's not caused by high blood pressure, diabetes, or a bad diet. It is pure physics plus the body's inevitable response to it. The way blood flows through a branch point reduces nitric oxide production at that specific location, at least to some degree, in every single person, regardless of how metabolically pristine they are.

This is exactly why atherosclerosis almost always starts at the same anatomical locations, ie the inner curve of the coronary arteries, the carotid bifurcation in your neck, the femoral bifurcation in your groin. This isn't random. They're the branch points where the physics of blood flow have permanently created a more permissive environment for plaque.

So when someone asks "does LDL cause atherosclerosis on its own, without any cofactors?", the real answer is that the question itself is the wrong question, and is unanswerable, because LDL is never and can never be operating by itself at the places where atherosclerosis starts. The ever-present cofactor, reduced nitric oxide at branch points, is a result of structure. It's built into the anatomy of every human body. It existed in you before you ate your first meal. And it's there right now, regardless of your triglycerides, your insulin, or your inflammatory markers.

This means that even a completely metabolically healthy person, with low inflammation, a perfect VO2 max, good blood pressure, and pristine insulin sensitivity is still continuously sending apoB containing particles into an environment that is, at the branch points, constitutively primed for plaque development. And the more apoB containing particles you're sending, the higher your apoB, and the faster that process can unfold.

The Fire Analogy

So how do you hold all of this in your head so you can hopefully use it for clarity can help fend off confusing narratives out there? Please consider this analogy.

Atherosclerosis is like a fire. And you have two primary levers to pull to prevent and treat it.

Here's how the analogy works:

Think of the wood as your apoB-containing lipoproteins, ie LDL, VLDL, IDL, and Lp(a). All carry exactly one apoB each and all are atherogenic, though LDL predominates in the fasting state and represents the largest and longest-lived fraction. In general though, the more wood you have around, the bigger the potential fire.

The firepits are your arterial branch points, ie the bifurcations (and to a lesser extent sharp curves/twist/turns. They're built into your anatomy. Every single person has them. They never go away. They are always structurally ready to 'ignite' if enough wood gets in there. No dietary pattern, no drug, and no amount of metabolic optimization can change this structure.

The spark is lipoprotein retention, when an LDL particle enters the arterial wall and gets stuck. Once the spark happens, the fire is essentially lit. It may burn slowly or rapidly depending on conditions, but it's going. Technically, early lesions can sometimes stabilize and even regress with aggressive intervention, like the fire smoldering down and becoming more contained, but this is far harder to achieve once significant plaque is established.

The tinder condition is the state of your endothelial nitric oxide production, essentially, how receptive your arterial wall is to letting that spark turn into a flame. High NO means wet tinder, and the spark has a hard time catching. Depleted NO means dry tinder, where everything can ignite quickly and burn hot.

The permanent accelerants we are aware of are aging and Lp(a). Lp(a) levels are mostly genetically determined and don't usually change meaningfully over time, so if your levels are very elevated, it's likely there continuously and potentially doing its damage. Right now we have limited ability to lower it, though that is an active area of drug development. These are like flammable lining baked into the firepit itself. Right now at least, you can't directly treat them, but you can and should account for them, adjusting effort levels on all parts you can control accordingly.

The variable accelerants are your modifiable risk factors like high blood pressure, insulin resistance, smoking, obesity, dyslipidemia. These are like lighter fluid or gasoline, and they can dramatically worsen the tinder condition, but you can mostly or completely remove them with the right interventions.

Water is everything you do to protect and restore your nitric oxide production, to help it act like a fire hose, like dietary nitrates from leafy greens and beets, polyphenol-rich foods, improved insulin sensitivity, reduced saturated fat, better gut health, stress management, sleep, exercise. This is Lever 2.

Lipid-lowering strategies, ideally dietary/lifestyle based, but also pharmaceutical as needed, reduce the wood supply going into all the firepits, regardless of how dry the tinder is. This is Lever 1.

A CRUCIAL POINT: For optimal effect, you need to pull both levers, because pulling only one is incomplete.

If you reduce your apoB/wood supply with an apoB lowering drug, but keep drying out the tinder by eating a highly processed, high saturated fat, high sugar, and/or high animal food diet, working against those apoB lowering effect and directly harming your endothelium, and wrecking your gut microbiome, you're addressing only half the problem.

And if you optimize your tinder by fixing blood pressure, insulin resistance, reducing inflammation, and improving your metabolic health, but simultaneously pour more wood onto the fire by eating a diet that raises your apoB, or leaving an already high level alone by not using whatever treatments are needed to lower it when diet/lifestyle aren't enough, you're also only addressing half the problem. And remember the firepits are still there. They are always there. More wood into a lit firepit, even a somewhat less dry one, still makes a bigger fire.

What About the Keto and Carnivore Argument?

Let me be direct about this, because I'm hearing it constantly. The argument goes: "Ketogenic and carnivore diets improve insulin sensitivity, lower inflammation, reduce triglycerides, and fix metabolic health, so even if LDL goes up, the overall cardiovascular risk is lower."

Some of that is true. These diets can genuinely improve metabolic markers. That's true, and I fully acknowledge it. And improving metabolic health does help dry less of the tinder, which clearly matters.

But here's what the argument misses: the firepits don't care how good your insulin sensitivity is.

For example, we have data from the PESA study, a large cohort of people examined for subclinical atherosclerosis, showing that LDL alone can independently predict plaque even in people who are free of every conventional risk factor. Metabolically healthy people can still eventually develop atherosclerosis when their LDL is elevated because, again, the branch points are still there, still permissive to the process, still receiving an elevated supply of lipoprotein substrate/wood into the lining/firepit.

A CRITICAL FACT VERY FEW ARE AWARE OF:

Here's something that adds another layer of concern: research published back in the 1990s showed that native LDL, ie normal, unoxidized LDL, the kind circulating right now in everyone's bloodstream, can directly cause the endothelial enzyme eNOS to produce superoxide (a damaging oxidant) instead of nitric oxide, even before any oxidation of the LDL itself occurs. This means that elevated LDL doesn't just increase the wood supply. It can simultaneously make the firepit more conducive to fire also, all by itself. So the two variables I am speaking about here acturally aren't fully independent of each other. High LDL, on its own, can worsen the very environment it's being deposited into.

So improving the firepit conditions while leaving a high circulating apoB/wood supply, in a body full of firepits that never go out, is not a complete prevention strategy.

It's one lever, and you need both.

As for the "lean mass hyper-responder" hypothesis, ie the subset of people on ketogenic diets whose LDL skyrockets, the available data amounts to a handful of case reports and the KETO-CTA study, which attracted immediate and widespread methodological criticism including selective data reporting and questionable statistical analysis, and was formally retracted in March 2026. A reanalysis preprint is currently under peer review elsewhere. None of this is anywhere near sufficient to establish the long-term cardiovascular safety of sustained extreme apoB elevation. Plus the framework I've described here predicts that sustained very high apoB, even in these individuals, will eventually produce progressive atherosclerosis at the bifurcation sites over time, regardless of their metabolic optimization. I sincerely hope I'm wrong. But I wouldn't bet anyone's coronary arteries on it.

So What Should You Actually Do?

Here are my bottom lines:

1. Test your apoB. Not just your LDL-C. Your apoB tells you how many atherogenic particles are circulating. If you don't know your number, get it tested.

2. Test your Lp(a). It's a permanent accelerant you can't change, but knowing it helps you understand your risk and how aggressively you need to address everything else.

3. Consider imaging. Tests like CAC scoring, CIMT ultrasound, and AI plaque analysis from CCTA show how much plaque burden has already accumulated over your lifetime. They are the most powerful tools we have for understanding where you actually stand, vs making educated guesses off of history and lab testing.

4. Pull both levers. Don't just fix your metabolic markers while ignoring your LDL. Don't just take a statin while eating a diet that wrecks your endothelium. Address both the wood supply and the tinder, consistently, over decades.

5. Don't be fooled by the "metabolic health is all that matters" argument. The firepits are real. They're in you right now. More wood into a lit firepit, however good your insulin is, will almost always still make a fire at some point or another.

Want to Go Even Deeper?

I'm launching two new group courses for heart attack and stroke prevention starting in late September and late October, with more details coming soon. One course is designed for healthcare providers, and the other for the general public. These programs are built around exactly this kind of integrated, evidence-based understanding of and approach to cardiovascular risk. Click the links below to register now with early bird pricing:

PRACTITIONERS COURSE:

• CLICK HERE for more info and to register (early bird pricing through July 31st, 2026)

PUBLIC COURSE: The F.L.O.W. Method for Heart and Stroke Prevention

• CLICK HERE for more info and to register (early bird pricing through July 31st, 2026)
  

The information in this post is for educational purposes and does not constitute personalized medical advice. Please consult a qualified healthcare provider for guidance specific to your situation.