When Mechanisms Become Marketing: Seed Oils, Carnivore Diets, and Wellness Claims

From HormoneSynergy® Longevity Medicine | Portland & Lake Oswego, Oregon

Nutrition arguments online often begin with something true. Linoleic acid can oxidize. ApoB-containing particles participate in atherosclerosis. Meat provides highly bioavailable protein. Raw milk is less processed than pasteurized milk. Plants produce compounds that serve defensive roles.

None of those facts, by itself, tells us what someone should eat for the next thirty years.

Clinical nutrition has to answer a harder question: what happens to people over time? That means looking beyond a biochemical pathway to cardiovascular risk, metabolic health, body composition, nutrient adequacy, dietary pattern, adherence, and actual clinical outcomes.

The seed oil and carnivore debates are useful examples because they show how quickly a legitimate scientific discussion can become something much simpler online. One mechanism is elevated above everything else, uncertainty disappears, and an entire dietary philosophy can be built around it.

A Mechanism Can Be Correct and Still Mislead

Medicine depends on mechanisms. We want to understand why atherosclerosis develops, how insulin resistance progresses, how inflammation affects tissue, and how nutrients influence metabolism.

Problems arise when one part of that biology is treated as though it settles the entire clinical question.

Consider linoleic acid. It is a polyunsaturated omega-6 fatty acid and, like other unsaturated fats, can undergo oxidation under certain conditions. That biochemical observation is real. It does not establish that eating ordinary amounts of foods containing linoleic acid causes heart attacks, diabetes, chronic inflammation, mitochondrial failure, or the collection of chronic illnesses sometimes attributed to seed oils online.

Those claims require human evidence.

Randomized trials examining dietary linoleic acid have not shown a consistent increase in common inflammatory markers such as C-reactive protein, interleukin-6, or tumor necrosis factor. Cardiovascular nutrition research also has to account for what replaces a particular fat. Replacing saturated fat with unsaturated fat is not physiologically equivalent to replacing it with refined carbohydrate.

The comparison matters because people do not eat nutrients in isolation. They eat meals and dietary patterns.

Seed Oils Are Not the Same Thing as Ultra-Processed Food

Some of the strongest criticism of seed oils comes from an observation that is hard to dispute: they are common ingredients in fast food, packaged snacks, fried foods, commercial baked goods, and other ultra-processed products.

That does not make the oil the sole reason those foods are unhealthy.

A person who stops eating french fries, chips, packaged pastries, fast food, and highly processed snacks may reduce calories, refined starches, added sugars, sodium, and other components of an unhealthy dietary pattern at the same time. If that person feels better or loses weight, it does not tell us which ingredient was responsible.

This is one reason we generally favor minimally processed foods at HormoneSynergy®. Extra virgin olive oil is a sensible default. So are nuts, seeds, avocado, seafood, and other whole-food sources of unsaturated fats. We are not trying to persuade people to consume more industrially refined oil.

We also do not tell them that a tablespoon of canola or soybean oil has somehow poisoned their metabolism.

Paul Saladino Is a Useful Case Study, but Not for the Reason People Think

Paul Saladino, M.D., became widely known for promoting a strict carnivore diet. His own dietary approach later changed. He added carbohydrates, including fruit and honey, along with raw dairy, and now describes his diet as “animal-based” rather than strict carnivore.

His current material centers on meat, organs, fruit, honey, and raw dairy while continuing to argue strongly against seed oils and linoleic acid. More recently, he has also discussed ApoB, saturated fat, and why saturated fat can raise ApoB.

There is nothing inherently wrong with that evolution. Physicians, researchers, and patients should change their views when new evidence or experience justifies it. A nutritional philosophy should not become a permanent identity that someone is afraid to revise.

The more interesting issue is certainty.

A strict carnivore diet was once presented with considerable confidence. The current animal-based version is different in important ways. If a nutritional prescription changes substantially over time, that history should make us more careful about presenting the newest version as though the major scientific questions have now been settled.

This is not unique to Saladino. Wellness media rewards certainty. “Here is what we know, here is what we do not know, and here is where reasonable experts still disagree” is rarely the headline that goes viral.

What Do We Actually Know About the Carnivore Diet?

The scientific literature is much smaller than its online presence suggests.

A 2026 scoping review of the carnivore diet found only nine eligible human studies. Some reported potentially favorable short-term findings such as weight loss, greater satiety, or improvements in selected metabolic markers. The same review identified concerns about nutrient adequacy, very low fiber intake, and increases in LDL cholesterol and total cholesterol. Most importantly, the authors emphasized how limited the evidence remains because studies have generally been small, short, uncontrolled, or otherwise unable to establish long-term safety.

That leaves plenty of room for individual experience without pretending that individual experience answers the longevity question.

Someone may feel much better after beginning a carnivore diet. We take that seriously. But eliminating nearly every food category also removes alcohol, refined carbohydrates, desserts, many ultra-processed foods, restaurant meals, and foods that an individual may not tolerate well. Improvement after such a dramatic elimination does not establish that plants were the original problem or that the elimination diet is optimal for decades.

Animal foods themselves are not the problem. Eggs, seafood, dairy, poultry, and meat can provide complete protein, iron, zinc, vitamin B12, choline, and other important nutrients. Adequate protein becomes especially important with aging because preserving lean mass, strength, and function is central to longevity.

That is very different from concluding that vegetables, legumes, berries, nuts, seeds, whole grains, fiber, and plant diversity have no place in a healthy diet.

Why ApoB Cannot Be Hand-Waved Away

The seed oil argument often focuses heavily on oxidized LDL. Oxidative modification of lipoproteins is part of atherosclerotic biology, but it does not make ApoB irrelevant.

ApoB provides an estimate of the number of circulating atherogenic lipoprotein particles. These particles include LDL and other cholesterol-carrying particles capable of entering the artery wall. Contemporary cardiovascular literature increasingly recognizes ApoB as a useful measure of atherogenic particle burden, particularly when LDL cholesterol and particle number are discordant.

Metabolic health remains important. Insulin resistance, blood pressure, smoking, visceral fat, inflammation, glucose control, physical activity, kidney health, and genetics all influence cardiovascular risk.

Being metabolically healthy does not make a high burden of ApoB-containing particles biologically irrelevant.

This is why HormoneSynergy® does not evaluate cardiovascular risk through one marker or one nutrition ideology. We look at the patient in front of us.

For more on this topic, see ApoB and Longevity: Why Lipoprotein Particles Matter.

Raw Milk Shows the Same Problem From Another Direction

Raw milk is often described with words such as natural, ancestral, traditional, and unprocessed. Those descriptions may be accurate. They do not answer the food-safety question.

Pasteurization was developed because untreated milk can transmit pathogenic organisms. CDC continues to identify organisms including Campylobacter, pathogenic E. coli, Listeria, Salmonella, Brucella, and Cryptosporidium as potential hazards of raw dairy.

The risk is not theoretical. CDC investigated another multistate E. coli outbreak involving raw dairy products in 2026. Several people were hospitalized, including a patient who developed hemolytic uremic syndrome.

None of this means that everyone who drinks raw milk becomes ill. Most will not. It means there is a preventable microbial risk that does not disappear because the product is described as natural.

There is also no need to turn this into another food war. Someone can value farms, local agriculture, minimally processed food, animal husbandry, and nutrient quality while still recognizing why pasteurization became one of public health's major food-safety interventions.

Why Feeling Better Is Important, but Not Enough

One of the weaknesses in many nutrition arguments is the assumption that a person feeling better proves the underlying theory.

Symptoms matter. If someone removes a food and their gastrointestinal symptoms improve dramatically, that information is clinically useful. If a dietary change improves energy, appetite control, glucose, or body weight, we want to know that too.

But symptom improvement cannot tell us everything about cardiovascular risk, bone health, nutrient adequacy, lean mass, or what will happen after twenty years.

Someone can feel excellent while ApoB is rising. Someone can lose weight while losing substantial lean tissue. Someone can follow a highly restrictive diet and initially improve gastrointestinal symptoms while gradually narrowing nutrient intake. Someone can also eat what appears to be a textbook Mediterranean diet and still have insulin resistance, high Lp(a), hypertension, or excessive visceral fat.

That is why longevity medicine needs measurements as well as narratives.

What We Look at Instead

At HormoneSynergy®, nutrition is part of a larger clinical picture. We want to know whether a dietary pattern is supporting adequate protein and lean mass, whether visceral fat is improving, whether blood pressure and glucose regulation are healthy, and what is happening to triglycerides, ApoB, Lp(a), inflammatory markers, and other relevant cardiovascular risks.

Body composition matters as well. Weight alone cannot tell us whether someone is preserving muscle or accumulating visceral fat. DEXA and body-composition assessment can provide information that a bathroom scale cannot.

Learn more about DEXA body composition and visceral fat assessment.

We also care whether someone can sustain the diet without creating unnecessary fear around food. A longevity diet has to work outside a podcast studio. People travel, eat with family, age, develop new medical conditions, take medications, and experience changes in activity and appetite. Dietary recommendations should be able to adapt with them.

Plant Foods and Animal Foods Do Not Need to Be Enemies

The internet prefers opposites. Meat or plants. Saturated fat or seed oils. Carnivore or vegan. Natural or medical. Traditional or modern.

Human physiology is not obligated to follow those categories.

For many adults, particularly in midlife and later life, animal foods can make it easier to obtain adequate high-quality protein. Fish, eggs, fermented dairy, poultry, and appropriately selected meat can fit comfortably within a longevity-oriented diet.

Plant foods contribute fiber, potassium, polyphenols, unsaturated fats, and a wide range of micronutrients and phytochemicals. Large bodies of cardiovascular and dietary-pattern research support diets rich in minimally processed plant foods.

We generally favor a protein-forward Mediterranean pattern rather than an ideological restriction of either category. The exact balance can vary according to metabolic health, cardiovascular risk, gastrointestinal tolerance, body composition, preferences, ethics, and individual goals.

Where Seed Oil Panic Gets the Clinical Priorities Backward

A patient can spend enormous effort eliminating every trace of soybean or sunflower oil while overlooking hypertension, smoking, poor sleep, visceral obesity, low muscle mass, insulin resistance, elevated ApoB, high Lp(a), or a sedentary lifestyle.

Those are not minor details.

If replacing fried fast food with home-cooked meals also eliminates most seed oils, excellent. If someone prefers olive oil because of its evidence base, flavor, and place in Mediterranean dietary patterns, we agree.

The problem begins when avoiding seed oils becomes a substitute for understanding the person's actual cardiovascular and metabolic risk.

Food purity is not a biomarker.

A More Useful Standard for Nutrition Claims

When we hear a strong nutrition claim, we want to know what kind of evidence supports it. Is it based on a cellular mechanism, an animal model, a short feeding study, an observational association, a randomized human trial, or long-term clinical outcomes? Does the conclusion depend on what one food or nutrient was compared with? Are the people in the research similar to the person receiving the advice?

We also want to know whether the claim has survived evidence that could have disproved it.

A theory that explains every positive outcome and has a ready-made explanation for every contradictory result is difficult to test. That is one reason dietary communities can gradually become identities rather than scientific hypotheses.

Nutrition science is imperfect. Studies conflict. Dietary assessment is difficult. Long-term randomized trials are expensive and often impractical. None of that gives us permission to replace uncertainty with certainty simply because certainty makes better content.

Medicine, Not Marketing

HormoneSynergy® is not anti-meat, anti-fat, anti-carbohydrate, or pro-seed oil. We have no interest in defending ultra-processed food or pretending that the standard American diet is serving people well.

We are interested in outcomes.

Can you maintain muscle and strength as you age? Is your visceral fat under control? Are you insulin sensitive? What is your ApoB? What is your blood pressure? Are you getting enough protein, fiber, micronutrients, and essential fats? Does your dietary pattern reduce cardiovascular risk rather than merely changing the story you tell about it?

Those questions are less dramatic than declaring a food toxic. They are also much closer to the work of medicine.

For patients who want a comprehensive assessment of cardiovascular, metabolic, cognitive, and body-composition risk, learn more about HormoneSynergy® Concierge Longevity Medicine.

Related Reading

• ApoB and Longevity: Why Lipoprotein Particles Matter
• DEXA Bone Density, Body Composition & Visceral Fat
• Concierge Longevity Medicine in Portland & Lake Oswego

Selected Clinical References

• Su H, et al. Dietary linoleic acid intake and blood inflammatory markers: a systematic review and meta-analysis of randomized controlled trials. Food & Function. 2017.
• American Heart Association. Dietary fats and cardiovascular disease scientific guidance and subsequent guidance regarding seed oils and dietary patterns.
• European Atherosclerosis Society. Clinical staging to guide management of metabolic disorders and their sequelae: consensus statement. European Heart Journal. 2025.
• Carnivore Diet: A Scoping Review of the Current Evidence, Potential Benefits and Risks. 2026.
• U.S. Centers for Disease Control and Prevention. Raw Milk: Food Safety guidance. Updated 2025.
• U.S. Centers for Disease Control and Prevention. Multistate E. coli outbreak investigation involving raw dairy products. Final update April 2026.

Frequently Asked Questions

Are seed oils toxic?

Current human evidence does not support describing commonly consumed seed oils as uniquely toxic. Seed oils are rich in polyunsaturated fats, including linoleic acid. Randomized trials have not shown a consistent increase in common inflammatory markers when linoleic acid intake is increased. The health effect of a dietary fat also depends on what it replaces and on the overall dietary pattern.

Do seed oils cause inflammation?

The common claim that dietary linoleic acid predictably causes systemic inflammation is not supported by randomized human trials. This does not mean every food containing seed oil is healthy. Many ultra-processed foods contain refined oils along with refined starches, sugars, sodium, and excess calories, which is a different question from whether linoleic acid itself is inflammatory.

Is the carnivore diet healthy long term?

There is not enough high-quality long-term human evidence to establish the carnivore diet as an optimal longevity diet. A 2026 scoping review found only nine eligible human studies and identified both possible short-term benefits and potential concerns involving nutrient adequacy, fiber intake, and LDL cholesterol. Long-term outcomes remain uncertain.

Why does HormoneSynergy® pay attention to ApoB?

ApoB reflects the number of circulating atherogenic lipoprotein particles. These particles are involved in the development of atherosclerosis. ApoB can be particularly useful when LDL cholesterol does not accurately reflect particle burden. It is considered alongside blood pressure, insulin resistance, visceral fat, inflammation, smoking, Lp(a), family history, and other cardiovascular risk factors.

Is raw milk healthier than pasteurized milk?

Raw milk is less processed, but that does not establish that it produces better health outcomes. Pasteurization reduces exposure to pathogens that can cause serious foodborne illness. CDC recommends pasteurized milk and dairy products as the safer way to obtain the nutritional benefits of dairy.

Does HormoneSynergy® recommend avoiding animal foods?

No. Animal foods can provide high-quality protein, vitamin B12, iron, zinc, choline, and other nutrients. HormoneSynergy® generally favors a protein-forward Mediterranean dietary pattern that can include animal and plant foods, individualized according to cardiovascular risk, metabolic health, body composition, tolerance, preferences, and ethical considerations.

What should I look at instead of following a nutrition influencer?

Start with measurable health outcomes. Protein intake, lean mass, visceral fat, blood pressure, glucose regulation, triglycerides, ApoB, Lp(a), physical activity, sleep, and overall dietary quality provide more clinically useful information than allegiance to a particular nutrition tribe.

This article is educational and is not individualized medical advice. Dietary recommendations should be adapted to medical history, medications, cardiovascular risk, metabolic health, gastrointestinal conditions, allergies, nutritional needs, and personal preferences.