Few nutrition topics create more confusion than fat and cholesterol. One person says saturated fat is dangerous. Another says LDL cholesterol does not matter. Someone else says seed oils are inflammatory poison. Then someone points to olive oil, omega-3s, carnivore diets, Mediterranean diets, keto diets, cholesterol numbers, ApoB, Lp(a), and suddenly the average person has no idea what to believe.
That is why this conversation with Dr. Kevin Maki is so valuable.
Dr. Maki is the former president of the National Lipid Association and currently serves as co-editor-in-chief of the Journal of Clinical Lipidology. He has spent decades studying lipids, fatty acids, diet, and cardiovascular risk. And what he brings to the conversation is something that is badly needed right now: precision.
Not fear. Not ideology. Not tribal nutrition warfare. Precision.
The truth is that LDL matters. Saturated fat matters. The food matrix matters. Genetics matter. Inflammation, blood pressure, insulin resistance, kidney health, smoking, and family history all matter too. Cardiovascular risk is not one number, one food, or one villain. It is a system.
And if we want to make better decisions, we have to stop flattening that system into slogans.
LDL cholesterol matters, but it is not the whole story
One of the most important parts of this conversation is that Dr. Maki does not dismiss LDL cholesterol. He also does not treat it as the only thing that matters.
That balance is almost always what’s missing from this topic.
The evidence that LDL plays a causal role in atherosclerotic cardiovascular disease is very strong. In 2017, the European Atherosclerosis Society reviewed genetic studies, Mendelian randomization studies, prospective cohort studies, and randomized clinical trials and concluded that LDL is directly involved in the ASCVD process. This report also emphasized that LDL risk is cumulative, meaning that risk is a question of exposure over time.
This does not mean everyone needs to panic over a single lipid panel. It means LDL should be understood as one form of long-term cardiovascular exposure. If LDL particles are circulating at higher levels for years or decades, more of those particles have the opportunity to enter the artery wall, become retained, and contribute to the slow development of plaque.
The 2020 EAS consensus statement walks through this biology in detail, showing how LDL and other ApoB-containing particles cross the endothelium, become trapped in the arterial wall, and help drive foam cell formation, inflammation, plaque growth, and eventually plaque rupture or erosion.
That is why randomized trials consistently show that lowering LDL reduces risk. The Cholesterol Treatment Trialists’ Collaboration found that each 1 mmol/L reduction in LDL cholesterol, which is about 39 mg/dL, reduced major vascular events by roughly one-fifth in those at a low risk of CVD. A later JAMA meta-analysis found a similar pattern across multiple types of LDL-lowering therapies, not just statins. The more LDL was lowered by proven mechanisms, the more cardiovascular risk declined.
So no, LDL does not “not matter.”
But LDL is not the whole risk profile.
That is the point Dr. Maki keeps returning to. Cardiovascular disease is not caused by one number in isolation. A person’s risk is shaped by family history, blood pressure, smoking, insulin resistance, inflammation, kidney function, coagulation, HDL, triglycerides, Lp(a), ApoB, and whether plaque has already begun to accumulate.
Dr. Maki uses his “FLASH-GLICK” framework to make this point: LDL is one major piece of the risk equation, but it has to be interpreted alongside the rest of the system.
A young, metabolically healthy person with an LDL of 110 and no other major risk factors is not in the same category as someone with an LDL of 110 plus high blood pressure, insulin resistance, elevated Lp(a), chronic inflammation, kidney disease, and evidence of coronary plaque. The LDL number may be the same. The biology is not.
This is also why ApoB is becoming such an important part of the discussion. LDL-C tells us how much cholesterol is being carried inside LDL particles. ApoB gives us a better estimate of the number of atherogenic particles, because each LDL particle, remnant particle, and Lp(a) particle carries one ApoB molecule. In other words, ApoB helps answer a slightly different question: how many potentially plaque-forming particles are circulating?
That can matter clinically because two people can have the same LDL-C but different ApoB. A large UK Biobank analysis found that ApoB varies widely at the same LDL-C level, and when ApoB and LDL-C disagree, ApoB more closely tracks cardiovascular risk.
Lp(a) adds another layer. Unlike LDL, Lp(a) is mostly genetically determined. You do not meaningfully lower it with diet and exercise. The 2022 EAS consensus statement concluded that elevated Lp(a) is a causal risk factor for ASCVD and aortic valve stenosis, and recommends measuring it at least once in adulthood.
So the practical takeaway is not “LDL is everything.” The better takeaway is that LDL matters because ApoB-containing particles help drive plaque formation, but cardiovascular risk is still a full-body, full-context problem.
That is the more adult conversation. It gives LDL the seriousness it deserves without turning it into a single-number religion.
Saturated fat is not magic, poison, or meaningless
Once LDL enters the conversation, saturated fat usually follows right behind it. And this is where nutrition advice often becomes too simplistic.
The standard message has been repeated for decades: saturated fat raises LDL cholesterol, LDL cholesterol raises heart disease risk, therefore saturated fat should be kept as low as possible. There is truth in that chain, but it is not the whole story.
Controlled feeding studies do show that saturated fats can raise LDL cholesterol, especially when they replace unsaturated fats. A major meta-analysis of 60 controlled trials found that replacing saturated fat with unsaturated fat improves lipid markers, while replacing saturated fat with carbohydrate does not produce the same effect and may raise triglycerides.
So yes, the replacement matters. Swapping butter for olive oil is not the same as swapping steak for pretzels. Saturated fat does not exist in isolation. It exists inside a whole diet, inside a person with a specific lipid profile, metabolic state, family history, and total cardiovascular risk burden.
The clinical outcome data are also more nuanced than the public message suggests. The 2020 Cochrane review found that reducing saturated fat intake lowered combined cardiovascular events, but had little or no effect on all-cause mortality or cardiovascular mortality. That means the benefit appears modest, outcome-specific, and highly dependent on what replaces it.
Observational data show the same complexity. A large systematic review found that saturated fat intake was not clearly associated with all-cause mortality, cardiovascular disease, coronary heart disease, stroke, or type 2 diabetes, though the authors emphasized that the evidence was heterogeneous and limited by methodology. In contrast, industrial trans fats showed a much clearer association with harm.
This is why food-based thinking matters. The health effects of saturated fat cannot be predicted simply by counting grams of saturated fat, because the food matrix matters. Cheese is not butter. Yogurt is not processed meat. Beef is not a packaged pastry. These foods may contain saturated fat, but they come with different proteins, minerals, fermentation products, sodium levels, processing methods, and metabolic effects.
So the better question is not, “Is saturated fat good or bad?”
The better question is: for this person, in this dietary pattern, with this lipid profile and this risk level, does reducing saturated fat meaningfully improve their overall cardiovascular risk?
For someone with elevated ApoB, high LDL-C, insulin resistance, coronary plaque, or a strong family history of premature cardiovascular disease, it may make sense to reduce saturated fat and replace it with foods rich in unsaturated fats, like olive oil, avocado, nuts, seeds, and fatty fish. That is a targeted intervention.
But for someone to fear nutrient-dense foods simply because they contain saturated fat is not the level of thinking this conversation requires. Focus on the whole diet. Prioritize high-quality protein, fiber-rich plants, minimally processed foods, and healthy fats.
Seed oils are not the villain they have been made out to be
The seed oil conversation has become one of the loudest and most toxic debates in nutrition, and like most loud debates, it is often too simplistic.
One side acts as if seed oils are uniquely toxic and should be eliminated from the diet entirely. The other side acts as if there is nothing to discuss because linoleic acid can lower LDL cholesterol. The more honest answer sits somewhere in the middle.
From a cardiovascular standpoint, replacing saturated fat with polyunsaturated fats can improve LDL-related risk markers. That is part of why seed oils became so widely recommended in the first place. But the clinical outcome data are not as clean as the lipid data. A Cochrane review on omega-6 fats found that increasing omega-6 intake made little or no difference to cardiovascular deaths or total cardiovascular events, though it may reduce myocardial infarction risk, with the authors noting limitations in the evidence quality.
So the question is not simply, “Are seed oils good or bad?”
The better question is: what are they replacing, and what kind of diet are they part of?
If soybean oil replaces butter in someone with elevated LDL or ApoB, that may improve certain lipid markers. But if seed oils are mostly coming from fried foods, packaged snacks, fast food, and ultra-processed calories, then we are no longer talking about a clean comparison between fats. We are talking about an entire dietary pattern.
That distinction matters. Most people do not overconsume seed oils by pouring a tablespoon of canola oil into a homemade meal. They consume them inside foods designed to be easy to overeat. So while the evidence does not support treating seed oils as poison, it also does not mean we should ignore the food environment they often travel in.
Do not build your diet around fear, but do build it around quality. Use fats intentionally. Prioritize whole foods. Favor olive oil, avocado oil, nuts, seeds, fatty fish, and minimally processed sources of fat. And when seed oils show up mostly through ultra-processed foods, the problem is not just the oil. It is the whole package.
Omega-3 status may be one of the most overlooked markers
If seed oils get too much fear, omega-3 status probably gets too little attention. This is one of the more useful places to shift the conversation. Instead of obsessing only over what fats to avoid, we should also ask what fats people are missing.
EPA and DHA, the long-chain omega-3 fats found in fatty fish and fish oil, play important roles in cardiovascular physiology, triglyceride metabolism, inflammation signaling, and cell membrane function. The omega-3 index, which reflects EPA and DHA levels in red blood cell membranes, has been proposed as a meaningful marker of long-term omega-3 status, with early research linking higher levels to lower coronary heart disease mortality risk.
That point becomes especially relevant when people assume flax, chia, or walnuts are the same as fish. They are not. Those plant foods provide alpha-linolenic acid, or ALA, which the body can convert into EPA and DHA, but that conversion is limited and influenced by factors like sex, genetics, and background fatty acid intake. Human tracer studies often find DHA conversion from ALA to be very low, commonly under 1% of the oral ALA dose.
So the stronger message is not “eat less omega-6 at all costs.” It is to make sure you are getting enough EPA and DHA. That can come from fatty fish like salmon, sardines, anchovies, trout, and mackerel. It can also come from high-quality fish oil or algae-based DHA/EPA for people who do not eat fish.
The bigger point is that fat quality is not just about restriction. It is about balance, replacement, and status. And for many people, the most actionable move may not be panicking over seed oils. It may be eating more fatty fish, checking omega-3 status when appropriate, and building a diet where fats come from foods that actually support health.
Exercise is a lipid intervention too
One of the most important parts of cardiovascular prevention is not found in a supplement bottle or a single dietary rule. It is movement.
Dr. Maki describes exercise as something that improves many risk factors a little bit at a time. That may sound underwhelming, but it is actually powerful. A small improvement in insulin sensitivity, a small improvement in triglycerides, a small improvement in HDL cholesterol, a small improvement in blood pressure, and a small improvement in inflammation can add up to a meaningful shift in risk.
One of the clearest effects of exercise is on insulin sensitivity. After a bout of exercise, insulin sensitivity improves for roughly 48 hours. Dr. Maki compares exercise to a medication that takes 30 minutes to swallow. If you stop taking your blood pressure medication, your blood pressure goes back up. If you stop exercising, your insulin sensitivity worsens.
That is a perfect analogy.
Exercise is not something you “complete.” It is a recurring signal your body needs.
From a lipid standpoint, exercise tends to improve triglyceride clearance. When triglycerides go down, HDL cholesterol often goes up. This is one reason exercise has such a consistent relationship with better cardiometabolic health.
And importantly, Dr. Maki points out that resistance training has historically been the ignored stepchild of exercise science, but that is changing.
Cardiovascular disease prevention has long focused on aerobic exercise, and aerobic exercise is absolutely valuable. But muscle is a metabolic organ. Resistance training improves glucose disposal, supports insulin sensitivity, protects function, and helps preserve the physical capacity that determines how people age.
The future of prevention will not be cardio versus lifting. It will be both.
The future of prevention is better measurement
One of the most interesting parts of the conversation comes near the end, when Dr. Maki discusses artificial intelligence and medical imaging.
Right now, medicine often waits until disease is advanced before acting. But AI may help make imaging cheaper, faster, and more precise. That could transform preventive medicine by allowing clinicians to track early atherosclerosis, muscle loss, sarcopenia risk, and other structural changes long before they become obvious clinical problems.
Someone may have risk factors but no visible disease yet. Someone else may have only moderate risk factors but already have plaque. Someone may appear healthy by body weight but be losing muscle or accumulating visceral fat. Better imaging could help personalize care far more effectively than relying on population averages alone.
That is where medicine needs to go. Not one-size-fits-all dietary rules. Not treating LDL in isolation. Not dismissing muscle because it does not fit neatly into a standard visit. Not waiting for disease to become obvious before asking better questions.
The goal is to know your risk early, intervene intelligently, and keep the system functioning for as long as possible.
Action checklist
Know your ABCs. Track A1c or other markers of glucose control, blood pressure, and cholesterol, especially LDL cholesterol.
Ask about ApoB. LDL cholesterol is useful, but ApoB may give a better picture of atherogenic particle number, especially if triglycerides are elevated or risk is unclear.
Measure Lp(a) at least once. Lp(a) is largely genetic and can meaningfully modify cardiovascular risk.
Interpret LDL in context. LDL matters, but so do smoking, family history, blood pressure, insulin resistance, inflammation, kidney function, and existing plaque burden.
Do not reduce diet to saturated fat alone. The balance of cholesterol-raising and cholesterol-lowering factors matters more than any single nutrient.
Choose a dietary pattern you can sustain. A healthy diet can include animal protein, seafood, nuts, seeds, legumes, fruits, vegetables, whole grains, and unsaturated fats.
Do not fear seed oils automatically. Human evidence does not support the claim that linoleic acid from seed oils is inherently inflammatory.
Do not confuse seed oils with ultra-processed food. The problem with many processed foods is the total package: calories, refined starches, added sugars, low satiety, and poor nutrient density.
Check omega-3 status if possible. An omega-3 index around 8–11% may be a useful target, and many Americans are below that range.
Eat fatty fish or supplement strategically. Many people need more EPA and DHA than they get from diet alone.
Exercise every couple of days at minimum. Insulin sensitivity improves after exercise, but the effect fades, so consistency matters.
Lift weights. Resistance training is not optional for long-term metabolic health, muscle preservation, and aging well.
Avoid tobacco. Smoking remains one of the most important modifiable cardiovascular risk factors.
Protect sleep and manage stress. Cardiovascular risk is shaped by more than diet and cholesterol.
Stay humble. Nutrition science evolves. The best approach is not ideology. It is testing, tracking, adjusting, and being willing to update your beliefs when better evidence appears.
