NOW READING:Is the Carnivore Diet Heart-Healthy? New Research Raises Serious Concerns

October 13, 2026

Is the Carnivore Diet Heart-Healthy? New Research Raises Serious Concerns

A new scientific review examines the risks of eating only animal foods, revealing important questions about cholesterol, nutrient deficiencies, and long-term cardiovascular health.

The carnivore diet has become one of the most talked-about nutrition trends on social media. Its promise is simple: eliminate all plant foods, eat only animal products, and potentially experience dramatic improvements in weight, blood sugar, energy, and overall health.

Supporters share stories of remarkable transformations. Some report losing weight, improving their diabetes, or feeling better than they have in years.

But there's a much bigger question worth asking.

Even if the carnivore diet makes you feel better in the short term, what is it doing to your heart over the long term?

A new scientific review published October 13, 2026, in Recent Progress in Nutrition takes a close look at that question.

The paper, The Carnivore Diet and Cardiovascular Disease Risk: A Narrative Review, was authored by David Goldman, a member of the Plant Strong clinical research team, alongside Thomas Waterfall and Dr. Matthew Nagra.

The researchers examined the available scientific literature on the carnivore diet, including its nutritional composition, reported metabolic benefits, effects on cholesterol, and potential implications for cardiovascular disease.

Their conclusion deserves attention: Current scientific evidence does not support the long-term cardiovascular safety of the carnivore diet, and several characteristics of the diet raise significant concerns for heart health.

Here's what the research reveals.

What Is the Carnivore Diet?

Unlike traditional low-carbohydrate or ketogenic diets, which may include vegetables, nuts, seeds, and other plant foods, the carnivore diet eliminates plants entirely.

People following this eating pattern primarily consume meat, fish, eggs, animal fats, and sometimes dairy products.

That means no fruits, vegetables, whole grains, beans, lentils, nuts, or seeds.

Carbohydrate intake can approach zero, while protein and saturated fat intake often increase dramatically.

Advocates argue that eliminating carbohydrates and plant foods can reduce inflammation, improve metabolic health, and resolve chronic health problems.

But removing entire food groups introduces a different set of questions about nutritional adequacy and long-term disease prevention.

And according to this new review, those questions haven't been adequately answered.

Finding #1: The Carnivore Diet Has Never Been Proven Safe for Long-Term Heart Health

Perhaps the most surprising finding isn't what researchers discovered about the carnivore diet.

It's what scientists still don't know.

There are no randomized controlled trials or prospective cohort studies directly evaluating the carnivore diet's effects on cardiovascular outcomes.

In other words, despite its growing popularity, researchers have not conducted the kinds of long-term studies needed to determine whether eating exclusively animal foods increases or decreases the likelihood of experiencing a heart attack, stroke, or other cardiovascular event.

Much of the available evidence comes from surveys of carnivore diet followers, individual case reports, and theoretical analyses of the diet's nutritional composition.

These sources can provide useful early observations, but they cannot establish that the diet causes a particular health outcome.

For example, someone who adopts a carnivore diet might simultaneously eliminate soda, candy, refined carbohydrates, alcohol, and highly processed snack foods.

They might also begin eating fewer calories and losing weight.

If their blood sugar improves, which change deserves the credit?

Was it the elimination of plant foods? The reduction in calories? Weight loss? Or the removal of highly processed foods?

Without properly controlled studies, researchers cannot separate these effects.

The absence of evidence showing harm is not the same as evidence demonstrating safety.

This distinction is especially important when discussing a dietary pattern that people may follow for decades.

Finding #2: LDL Cholesterol Can Rise Dramatically

One of the most concerning findings involves LDL cholesterol, commonly called "bad" cholesterol.

LDL particles carry cholesterol through the bloodstream. Persistently elevated levels contribute to the buildup of plaque within artery walls, a process known as atherosclerosis.

Over time, this plaque can increase the risk of heart attack and stroke.

The relationship between LDL cholesterol and cardiovascular disease is supported by decades of genetic research, population studies, and clinical trials demonstrating that lowering LDL reduces cardiovascular events.

So what happens to LDL cholesterol when people follow a carnivore diet?

The review highlights several striking findings.

In a 2021 survey involving 2,029 adults following a carnivore diet, the median reported LDL cholesterol was 172 mg/dL, substantially higher than the commonly recommended level of under 100 mg/dL for many adults.

A smaller 2025 exploratory study of 24 carnivore diet followers reported that median LDL cholesterol increased from 157 mg/dL to 256 mg/dL after adopting the diet.

That's a rise of 99 points.

The review also describes individual case reports involving extremely elevated cholesterol.

In one published case, a man in his 40s developed yellowish cholesterol deposits on his hands, elbows, and feet after approximately eight months following a carnivore diet. His total cholesterol exceeded 1,000 mg/dL.

These findings do not mean everyone who adopts a carnivore diet will experience such dramatic increases. The survey data were self-reported, and extreme case reports cannot establish how frequently these outcomes occur.

But they demonstrate that substantial cholesterol elevations are possible and warrant serious attention.

The concern becomes even greater when elevated LDL persists over many years.

Atherosclerosis often develops silently, long before someone experiences symptoms.

Feeling healthy today doesn't necessarily mean your arteries are healthy for tomorrow.

Finding #3: The Carnivore Diet Eliminates One of the Most Protective Components of Food: Fiber

Fiber is one of the most consistently beneficial components of a heart-healthy dietary pattern.

And the carnivore diet contains virtually none.

Fiber comes from plant foods, including beans, lentils, fruits, vegetables, whole grains, nuts, and seeds.

It performs several important functions in the body.

Certain types of soluble fiber help lower LDL cholesterol by binding bile acids in the digestive tract and promoting their elimination. The liver then uses cholesterol to produce replacement bile acids, which can help lower cholesterol circulating in the bloodstream.

Fiber also helps regulate blood sugar, supports digestive health, and nourishes beneficial gut bacteria.

When gut bacteria ferment certain fibers, they produce short-chain fatty acids that help support intestinal health and influence inflammatory and metabolic processes.

The new review highlights a major scientific synthesis encompassing 185 prospective studies and 58 clinical trials.

Across these studies, people consuming the most dietary fiber experienced approximately 15% to 30% lower rates of several outcomes, including cardiovascular mortality, coronary heart disease, stroke, and all-cause mortality, compared with those consuming the least.

These are associations across the observational studies, supported by clinical trials showing improvements in important risk factors.

The research suggested particularly strong benefits around 25–29 grams of fiber per day, with additional intake potentially providing further benefit.

Now consider the contrast.

Someone following a typical carnivore diet consumes essentially zero grams.

That's not simply a low-fiber diet. It's the complete removal of a dietary component with substantial evidence supporting its role in cardiovascular health.

And unlike certain vitamins that may be obtained through supplements, fiber cannot be supplied by animal foods.

Finding #4: Saturated Fat and Sodium May Reach Extremely High Levels

The review also examined research modeling what people might consume on a carnivore diet.

The results were eye-opening.

In one nutrient-modeling study, saturated fat accounted for approximately 26% to 32% of total daily calories.

For comparison, the dietary guidelines discussed in the review recommend limiting saturated fat to less than 10% of calories.

Why does that matter?

Saturated fat can raise LDL cholesterol, particularly when it replaces unsaturated fats in the diet.

And elevated LDL is an established causal contributor to atherosclerotic cardiovascular disease.

The researchers also identified remarkably high sodium levels in some modeled carnivore meal plans, ranging from 7,200 to 8,789 milligrams per day.

For perspective, that is more than three times the commonly recommended maximum of 2,300 milligrams per day.

Consistently high sodium intake can contribute to elevated blood pressure, another major cardiovascular risk factor.

It is important to recognize that these figures came from modeled meal plans, not verified daily food records from a representative population of carnivore followers. Actual intake varies depending on food choices and preparation.

Nevertheless, these findings show how easily a meat-exclusive diet can depart from established heart-health recommendations.

Finding #5: Eliminating Plants Creates Important Nutritional Gaps

Animal foods can provide substantial amounts of protein, vitamin B12, zinc, selenium, and several other essential nutrients.

The researchers acknowledge these nutritional strengths.

But they also found significant limitations.

Studies modeling carnivore diets identified potential shortfalls in:

Vitamin C
Thiamin (vitamin B1)
Folate
Magnesium
Potassium
Calcium

These nutrients help support normal cardiovascular, metabolic, nerve, and immune function.

For example, potassium contributes to healthy blood pressure regulation, while magnesium plays a role in vascular function and normal heart rhythm.

Vitamin C contributes to normal connective tissue and antioxidant defenses.

The carnivore diet also eliminates plant-derived compounds such as polyphenols, which are associated with cardiovascular benefits.

Could someone attempt to address some deficiencies by carefully selecting organ meats or taking supplements?

Possibly.

However, the review notes that many carnivore followers report infrequent organ meat consumption and limited use of vitamin supplements.

The researchers also emphasize an important limitation: actual nutrient intake and biochemical nutrient status have not been adequately measured in people following the diet.

The nutritional models therefore identify potential risks rather than proving that every carnivore follower develops deficiencies.

Still, the central concern remains.

A dietary pattern that excludes every fruit, vegetable, whole grain, and legume must work much harder to deliver nutrients that whole plant foods naturally provide together.

Finding #6: Short-Term Improvements Don't Necessarily Equal Long-Term Health

This may be the most important takeaway from the entire paper.

Some people following carnivore diets report genuinely meaningful improvements.

The available studies describe weight loss, lower blood glucose, improved HbA1c in some people with diabetes, lower triglycerides, and higher HDL cholesterol.

These outcomes deserve to be acknowledged rather than dismissed.

But they also need to be interpreted correctly.

For instance, weight loss itself can improve blood pressure, glucose regulation, and several other metabolic markers.

Eliminating sugar-sweetened beverages and highly processed foods may also contribute to positive changes.

That doesn't establish that eliminating vegetables, fruits, beans, and whole grains provides additional benefit.

There's also a critical distinction between different cholesterol measures.

Carnivore diet advocates sometimes highlight increases in HDL cholesterol, often referred to as "good" cholesterol, as evidence of improved heart health.

But raising HDL cholesterol has not consistently been shown to reduce cardiovascular events.

Meanwhile, the evidence identifying LDL cholesterol as a causal factor in atherosclerosis is much stronger.

A person can have higher HDL, lower triglycerides, and significant weight loss while simultaneously developing dangerously elevated LDL cholesterol.

One favorable number doesn't cancel out an unfavorable one.

The review makes another crucial point: short-term changes in metabolic health and long-term cardiovascular disease operate on different timelines.

Blood sugar and weight may improve within weeks.

Atherosclerotic plaque can accumulate over decades.

A person may feel better while underlying cardiovascular risk increases.

That's why evaluating an eating pattern requires looking beyond weight loss or how someone feels after a few months.

We also need to understand what happens to their heart health over the years that follow.

Finding #7: What You Eat Instead of Carbohydrates Matters

One of the most useful sections of the review explores the broader research on low-carbohydrate diets.

Not all carbohydrate-restricted diets are nutritionally equivalent.

Consider the difference between replacing carbohydrates with animal fats and processed meats versus replacing them with plant foods such as nuts, seeds, and other minimally processed sources of plant protein and fat.

The researchers highlight a large prospective cohort analysis involving more than 129,000 participants from the Nurses' Health Study and Health Professionals Follow-up Study.

In that analysis, greater adherence to an animal-based low-carbohydrate dietary pattern was associated with 23% higher all-cause mortality, comparing the highest and lowest adherence groups.

In contrast, greater adherence to a vegetable-based low-carbohydrate pattern was associated with 20% lower all-cause mortality.

These are observational associations, not proof of cause and effect. And importantly, these participants were not following a true carnivore diet.

But the findings reinforce a broader nutritional principle.

The quality and sources of our food matter enormously.

It's not simply how many carbohydrates we eat.

It's whether we're getting our nutrition from foods consistently associated with better long-term health outcomes.

Finding #8: Heart-Healthy Dietary Patterns Already Have Strong Scientific Support

While researchers continue to investigate the carnivore diet, decades of research have examined dietary patterns rich in whole plant foods.

The Mediterranean and DASH diets are particularly well studied.

Both emphasize vegetables, fruits, whole grains, and other plant foods while limiting saturated fat and supporting cardiovascular health.

Unlike the carnivore diet, these dietary patterns have been evaluated in randomized controlled trials.

The review highlights evidence from the PREDIMED trial, which enrolled 7,447 adults at elevated cardiovascular risk.

Participants assigned to Mediterranean dietary interventions experienced approximately 28% to 31% lower relative risk of major cardiovascular events compared with the control group over a median follow-up of 4.8 years.

The DASH dietary trial also demonstrated meaningful reductions in blood pressure, particularly among participants with hypertension.

These findings don't mean every plant-based diet is automatically healthy.

A diet consisting primarily of refined flour, sugary beverages, and highly processed foods can be plant-based while still offering poor nutritional quality.

But diets centered on whole or minimally processed plant foods provide a combination of fiber, vitamins, minerals, and beneficial plant compounds that support cardiovascular health.

That's a fundamentally different approach from eliminating plants altogether.

What About Cancer and Longevity?

Heart health isn't the only consideration when evaluating a diet intended to promote lifelong wellness.

The researchers also reviewed evidence concerning red and processed meat consumption, cancer risk, and overall mortality.

The International Agency for Research on Cancer classifies processed meat as carcinogenic to humans and red meat as probably carcinogenic to humans, based principally on evidence concerning colorectal cancer.

Large observational studies have also associated higher intakes of red and processed meats with increased risk of certain chronic diseases and mortality.

However, there is an essential scientific distinction here.

No long-term studies have directly measured cancer incidence, cancer mortality, or overall mortality in people following a carnivore diet.

The review draws on research involving individual dietary exposures and broader animal-based low-carbohydrate patterns.

Those findings raise legitimate concerns, but they cannot tell us precisely how much a carnivore diet changes an individual's lifetime risk.

That question remains unanswered.

What Does This Mean for Your Own Plate?

The goal of nutrition shouldn't simply be to lose weight quickly, achieve a favorable laboratory result, or follow the latest social media trend.

It should be to establish an eating pattern that supports health over the long term.

At Plant Strong, we believe that means building meals around real, whole plant foods.

Fortunately, that doesn't have to be complicated.

Start with beans and lentils. They're naturally rich in fiber, provide plant protein, and can replace meat in soups, chilis, tacos, and countless other meals.

Make whole grains part of your routine. Oatmeal, barley, brown rice, and other intact or minimally processed grains provide energy, fiber, and important nutrients.

Eat a wide variety of vegetables and fruits. Different colors and varieties offer different combinations of vitamins, minerals, and phytochemicals.

Include a diversity of plant foods. Building variety into your meals supports nutrient adequacy and provides substrates for your gut microbiome.

Pay attention to your cardiovascular numbers. Blood pressure, LDL cholesterol, and other measurements can provide important information about cardiovascular risk. Work with your healthcare professional to understand your results, especially if you're making major dietary changes.

And remember, you don't have to transform your diet overnight.

Adding one plant-rich meal, swapping meat for beans, or choosing oatmeal instead of a meat-heavy breakfast can help move your eating pattern toward one supported by a substantial body of research.

The Bottom Line: Don't Confuse Feeling Better With Proven Long-Term Safety

The carnivore diet may produce short-term improvements in weight and certain metabolic measures for some people.

But this new scientific review highlights important reasons to question whether those changes translate into better cardiovascular health over the long term.

The diet eliminates fiber and multiple nutrient-rich plant food groups while potentially delivering very high amounts of saturated fat, sodium, and dietary cholesterol.

Existing reports also document concerning elevations in LDL cholesterol.

Most importantly, no controlled prospective studies have demonstrated that the carnivore diet is safe or beneficial for long-term cardiovascular health.

We need better research, and the authors clearly call for it.

In the meantime, we already have extensive evidence supporting dietary patterns centered on vegetables, fruits, legumes, whole grains, and other whole plant foods.

At Plant Strong, our philosophy is simple: Real Food For Real Life.

You don't need an extreme diet to take meaningful steps toward better health.

You need nourishing food, consistent habits, and an approach you can sustain.

And when it comes to protecting your heart, the evidence gives us plenty of reasons to keep plants on the plate.