There Are No Essential Sugars, But the Same Science Says Eat Plants

A carnivore doctor made the rounds on social media with a line that sounds like a mic drop: there are essential amino acids, there are essential fatty acids, and there are no essential sugars. He is right about the chemistry. There really is no such thing as an essential carbohydrate. What he does not mention is that the very institution that decides which nutrients are “essential,” the National Academies, sets numbers with that same rulebook that point squarely toward a diet built on plants. So let us take his premise seriously and follow it all the way to the end, because it does not land where he wants it to. If you want more of his arguments taken one at a time, we did that in the Ken Berry vegan-cardiologist fact-check.

Here is the short version. “Essential” is a narrow word with a specific meaning, and it was never a shopping list for a healthy diet. Once you understand what it actually means, the carnivore talking point deflates, and the case for eating plants gets stronger, not weaker.

What “essential” actually means in nutrition

In nutrition science, a nutrient is “essential” for one reason only: your body cannot build it from scratch, so you have to eat it. That is the whole definition. It is a statement about your internal chemistry, not a verdict on what belongs on your plate.

Why are there no essential carbohydrates

Carbohydrate fails the “essential” test for a boring reason. Your liver can manufacture all the glucose your body strictly needs out of protein and fat, through a process called gluconeogenesis. That is exactly why the National Academies, in their reference report on carbohydrate, fat and protein, wrote that the lower limit of dietary carbohydrate compatible with life is apparently zero, as long as you eat enough protein and fat (National Academies DRI report). Carnivore advocates love that sentence. But read the rest of the same report. In the very next sentence it says the amount of carbohydrate that provides for optimal health is unknown. To be fair to the other side, the same passage notes that some traditional populations ate very little carbohydrate with no apparent effect on health or longevity, and adds that a detailed modern comparison with high-carbohydrate populations has never been done. Then the report sets a carbohydrate range of 45 to 65 percent of calories and a fiber target, and it defines dietary fiber as material intrinsic and intact in plants. “Compatible with life” is the standard you use for a lifeboat, not for a life.

Does non-essential mean unnecessary

This is the pivot the meat-only crowd never makes. Fiber is also not classified as “essential.” Neither is any single antioxidant or phytochemical. Yet fiber is one of the most protective things you can put in your body, and it exists only in plants. So the label “not essential” tells you nothing about whether something keeps you healthy for fifty years. It only tells you whether its absence causes an immediate deficiency disease like scurvy.

Here is the cleanest way to see how weak the standard is. By the same definition, exercise is not essential either. Your body synthesizes no exercise, you can survive without it, and no deficiency disease follows from skipping the gym. Nobody concludes that exercise is optional for health. The things that actually kill people in wealthy countries, heart disease, cancer, type 2 diabetes, are not deficiency diseases. They are diseases of dietary pattern. “Essential” was the wrong yardstick from the start. Why “carbohydrate” is too broad a word to be useful, lumping a lentil in with a lollipop, is its own post: carbohydrates are a package deal.

What about creatine, carnitine and taurine

Carnivore advocates often pivot here, arguing that meat supplies compounds plants do not. It does, and it does not matter, for exactly the reason above running in reverse. Creatine, carnitine and taurine are not essential nutrients precisely because your body makes them. If “your body can make it” disqualifies carbohydrate from mattering, it disqualifies these too. You cannot use the essentiality rule in one direction and abandon it in the other. Athletes who want creatine can take it as a cheap vegan powder, and vegans tend to show a larger performance response because they start with lower muscle stores.

The same academy that defines “essential” points you toward plants

When the doctor invokes essential amino acids and essential fatty acids, he is borrowing the authority of the group that named them. Fair enough. So let us see what that same group recommends when it moves from “what keeps you alive” to “what keeps you well.”

Why is the carb recommendation higher than the fat and protein limits

The National Academies set an Acceptable Macronutrient Distribution Range: carbohydrate 45 to 65 percent of calories, fat 20 to 35 percent, protein 10 to 35 percent. Look at the floor of the carbohydrate range. Forty-five percent is higher than the top of both the fat range and the protein range, which each cap out at 35 percent. In plain English, the body that carnivore influencers cite as the referee for “essential” puts carbohydrate at the center of the plate, and an all-meat diet falls outside its ranges for both carbohydrate and fat. They also set a carbohydrate reference intake of 130 grams a day, based on the average minimum amount of glucose the brain uses.

What do the National Academies say about saturated fat and cholesterol

The same report says saturated fat, monounsaturated fat and cholesterol are all made by the body, have no known beneficial role in preventing chronic disease, and so are not required in the diet. Notice that the list includes the main fat in olive oil, which makes the point of this whole post for us: “not required” and “harmful” are different verdicts. The report saves the harsher one for three items. It set no safe upper limit for saturated fat, trans fat or cholesterol, not because they are harmless, but because any incremental increase raises heart disease risk, and it recommends keeping all three “as low as possible while consuming a nutritionally adequate diet.” It also concedes that zero saturated fat is neither possible nor advisable on a normal whole-food diet, since every fat source is a mixture. Notice the symmetry. By the doctor’s own logic, there is no essential saturated fat either. That argument cuts against him at least as hard as it cuts against sugar. We dig into this more in our piece on dietary cholesterol and your heart and our overview of dietary fat.

Can you get all your protein and amino acids from plants

Yes, and the “you have to combine proteins at every meal” idea has been dead in the professional literature for decades.

Do plants have all nine essential amino acids

They do, collectively. Every one of the nine indispensable amino acids is present across plant foods, and the Academy of Nutrition and Dietetics states plainly that a varied plant diet eaten over the course of a day supplies enough protein and amino acids, with no need to consciously pair rice with beans at a single sitting (Academy position paper, 2025). The old “complementary protein” rule from the 1970s was walked back by its own author, Frances Moore Lappe, in the 1981 edition of the book that popularized it. There is a mechanism behind why meal-by-meal combining was always unnecessary: your gut secretes and reabsorbs roughly 70 to 100 grams of its own protein every single day in the form of enzymes, mucus and shed intestinal cells, and that internal recycling mixes with a circulating pool of free amino acids. What you ate at breakfast is still available at dinner. Your liver does the complementing continuously, without being asked. The full protein story is in the protein question, settled.

Is the protein scoring system rigged against plants

Partly, and this is worth knowing before someone throws a DIAAS score at you. The standard digestibility-adjusted scoring systems, PDCAAS and DIAAS, measure amino acid profile and how much of the protein your gut actually absorbs. Soy protein scores near the top of the plant range on both, in the same band as animal proteins. Wheat gluten, the protein in seitan, is the honest exception: it is genuinely low in lysine and can score poorly against a child reference pattern. That is a real limitation, and the fix is eating beans on the same day, which anyone eating a varied diet does without thinking about it.

But a group of nutrition scientists made a sharper point in 2019: these scoring systems measure biochemistry, not health (Katz et al., Advances in Nutrition, 2019). PDCAAS and DIAAS do not measure fiber, saturated fat, heme iron, or anything else that arrives in the same bite as the protein. A scoring system that rates a hot dog above a lentil on protein quality is measuring something real. It is not measuring whether eating the hot dog or the lentil every day for thirty years is good for you.

Where did essential amino acids come from before they were in an animal

This is the part that quietly rearranges the whole argument, and it belongs alongside the plant-origin section further down this post. Animals cannot make the nine essential amino acids either. Not cows, not chickens, not you. Every essential amino acid in every steak on earth was built by a plant or a microbe first, using nitrogen that nitrogen-fixing bacteria pulled out of the air or the soil and handed to the plant. The animal-protein-superiority idea traces to a specific historical error rather than to biology: Osborne and Mendel’s early-1900s feeding experiments, which found infant rats grew poorly on plant protein and concluded animal protein was superior. Nobody noticed for decades that rat milk is roughly ten times more concentrated in protein than human milk, because rat pups grow roughly ten times faster than human infants. Using a rodent’s growth rate as the yardstick for human nutrition was a category error, and it shaped a century of nutrition science anyway.

Do vegans actually get enough protein

A 2025 analysis of long-term New Zealand vegans found that most of them, about 79 percent of men and 73 percent of women, met protein requirements once digestibility was accounted for, with lysine and leucine the amino acids most likely to run short in a poorly planned diet (PLOS ONE, 2025). The fix is not a steak. The fix is beans, lentils, tofu, tempeh and peas, which are exactly where lysine concentrates. This is what the word “well-planned” is doing in every serious recommendation, and it is not a high bar. For the practical side, see our guide to vegan nutrition basics.

Can you build muscle on a vegan diet

When total protein is matched, plant protein builds muscle just as well as animal protein. A controlled resistance-training trial found no difference in muscle or strength gains between habitual vegans and omnivores over twelve weeks at about 1.6 grams of protein per kilogram of bodyweight (Sports Medicine, 2021). The vegans did need more supplemental protein powder to reach that shared target, which is the real-world catch: hitting the number takes a bit more deliberateness.

Is plant protein better than animal protein for your health

Adequacy is the low bar. The more interesting question is what happens when you swap one for the other, and the answer favors plants. Harvard’s Nurses’ Health Study and Health Professionals Follow-up Study, following 131,342 people, found that substituting plant protein for animal protein was associated with lower all-cause and cardiovascular mortality (JAMA Internal Medicine, 2016). One honest caveat: the harm linked to animal protein was concentrated in people who also had at least one other unhealthy habit, and faded in the healthiest subgroup. An NIH-AARP analysis of more than 400,000 participants found that replacing just 3 percent of energy from animal protein with plant protein was associated with roughly 10 percent lower all-cause mortality (JAMA Internal Medicine, 2020). So the protein question does not end at “can you get enough.” It ends at “which source does better,” and it is not the steak.

How to get essential fats without eating animals

Where do vegans get omega-3

The two truly essential fatty acids, linoleic acid and alpha-linolenic acid, both come from plants: seeds, nuts and their oils. The longer-chain omega-3s, EPA and DHA, are the ones people are told to worry about. Here is the part the fish industry does not advertise: for the most part fish do not make EPA and DHA either. They accumulate it by eating algae. So even the case for eating fish is really a case for algae, the original source. If you have been told seed oils are the villain, our seed oils explainer and our coconut oil versus animal fat comparison are worth a read.

Do vegans really need to worry about DHA and EPA

Less than the supplement marketing implies, and this is honestly unsettled rather than closed. If you are a healthy adult eating a well-planned whole-food vegan diet, there is no good evidence that you need to supplement DHA and EPA, and no good evidence that a small dose harms you. It is a genuinely low-stakes decision, and anyone selling you certainty in either direction is going past the data.

The usual worry is that the body converts the plant omega-3, ALA, into the long-chain forms inefficiently. As a raw tracer percentage that is true, but the percentage is close to the wrong question. Most ALA gets burned for energy, which is not a failure, it is what fat is for, and a tracer figure says nothing about whether total synthesis meets tissue demand. Run the arithmetic instead: PET imaging in living humans puts brain DHA use at under 4 milligrams a day with a half-life in the brain of roughly two and a half years, against an adult fat store measured in tens of grams (Umhau et al., Journal of Lipid Research, 2009). There is also evidence that people who eat no fish convert ALA more actively than fish-eaters do, though the vegan subgroup in that particular cohort was small enough that it should be held loosely (Welch et al., American Journal of Clinical Nutrition, 2010).

Meanwhile the supplement trials keep coming up empty. Randomized trials have repeatedly failed to show cognitive benefit. The most recent, the PreventE4 trial, which gave 2 grams of DHA a day for two years to older adults who ate little omega-3, confirmed the DHA really did reach the brain, and still found no difference in cognition or brain structure (eBioMedicine, 2026). It was a mid-stage trial and lost 38 percent of participants, mostly to COVID-era disruption, so treat it as one strong piece rather than the final word. ALA on its own, by contrast, has its own favorable outcome data for mortality and heart disease (Naghshi et al., BMJ, 2021). So the plant-omega-3 position is not a consolation prize.

What to do in practice is simple. Eat ALA daily: a tablespoon of ground flaxseed or chia covers the baseline, and walnuts and hemp work too. Grind the flax, because whole seeds pass through largely intact. Do not cook everything in high-omega-6 oils, though the “ratio panic” is overblown and omega-6 is not a villain as a class. The strongest case for taking an algal supplement anyway belongs to pregnancy and breastfeeding, infants and young children, older adults with cognitive concerns, and anyone with a confirmed very low omega-3 index. For those cases, or for anyone who simply wants insurance against an open question, roughly 250 mg a day of algal EPA and DHA is the rough consensus among clinicians who recommend it at all, and it sits far below any dose where risks appear. We go through the trials, the biochemistry, the risks and the expert disagreement in full in our complete guide to whether vegans need DHA and EPA.

Plants are where these essential nutrients come from in the first place

Step back and notice what just happened in the two sections above. The essential amino acids and the essential fatty acids both trace back to the same place: plants. This is not a slogan, it is basic biochemistry, and it quietly dismantles the idea that meat is the “primary” source of anything.

Do plants make the essential amino acids

They do. Plants and microbes can build all twenty amino acids from scratch, including the nine that humans and other animals cannot make and therefore have to eat. When a cow eats grass, it is not creating those amino acids, it is harvesting them from the plant and burning most of them for its own life in the process. The protein in a steak is, in a real sense, repackaged plant protein that has already been routed through another animal’s metabolism. Eating the plant means going to the factory. Eating the animal means buying second-hand.

Where do essential fatty acids originate

Same story. Vertebrates, humans included, lack the enzymes needed to build linoleic acid and alpha-linolenic acid, the two essential fatty acids. Plants and algae have those enzymes. So every bit of essential fat in a cow, a fish or you was first synthesized by a plant or by algae and then eaten. We already saw this with the long-chain omega-3s in fish, which come from algae. The pattern is total: for the fats your body cannot make, the origin is always photosynthesis, never the animal.

Why is eating plants going straight to the source

Put those two facts together and the “purity” argument flips completely. Plants are the first-hand, unprocessed source of the essential building blocks of life. The animal is the middleman that took those building blocks, used up most of them, and passed along what was left, bundled with its own saturated fat, cholesterol, and, in the case of processed meat, a Group 1 carcinogen. If you want these nutrients at the source, you eat the source.

Is grass-fed beef a good source of omega-3

Not really, and the reason is a detail the “grass-fed is different” defense never survives. Fat from cattle, sheep and goats does not reach your plate the way it left the pasture. It passes first through the rumen, a fermentation chamber whose microbes hydrogenate unsaturated fats. Those microbes saturate omega-3s just as readily as omega-6s, which is exactly why even grass-fed beef stays a mediocre omega-3 source. It genuinely beats grain-fed beef, but the comparison that matters is scale: a few tens of milligrams of long-chain omega-3 per serving against well over a thousand in oily fish or an algae capsule. The process is also incomplete, so beef and dairy fat carry a few percent naturally occurring trans fats, and beef fat’s most abundant saturate is palmitic acid, the classic LDL-raiser, much of which the animal synthesizes itself regardless of what it ate. So the middleman does not merely waste energy. It chemically degrades the very fats you were told to eat it for. The chemistry is taken apart in our dietary fat deep dive and in coconut oil versus animal fat.

What does saturated fat do inside your cells

It jams a lock, and the mechanism has been understood since long before it had a name. In 1934 the physician who first defined insulin resistance ran a simple experiment: feed healthy men a high-fat diet for a few days, then give them sugar water, and their blood sugar spike roughly doubled compared with the same test after a high-carbohydrate diet. Fat was blocking the sugar, not the other way around. Modern biochemistry filled in the rest. Skeletal muscle handles 80 to 90 percent of your body’s insulin-stimulated glucose uptake, and when muscle cells are loaded with fat, particularly saturated fat like the palmitic acid rumen bacteria hand you, that fat breaks down into diacylglycerol and ceramide inside the cell. Those molecules activate an enzyme that puts the wrong phosphate group on a key relay in the insulin signaling chain, and the signal degrades before it can tell the cell to open its glucose channels (Kitessa and Abeywardena, Nutrients, 2016). Insulin is knocking. Saturated fat jammed the lock from the inside. This is also reversible: a randomized trial measured it directly and found a low-fat plant-based diet cut fat inside liver cells by roughly a third and inside muscle cells by roughly a tenth, while insulin sensitivity improved.

What do plants have that animal foods simply do not

Fiber is the famous one, but the bigger gap gets almost no airtime: antioxidants. When researchers assayed the total antioxidant content of more than 3,100 foods, beverages and spices, plant foods averaged on the order of 64 times more antioxidants than animal foods, with most animal foods sitting near zero (Carlsen et al., Nutrition Journal, 2010). That headline number is a mean lifted by antioxidant-dense herbs, spices and berries. Compare typical foods instead and the gap narrows to roughly ninefold, which is still an enormous difference. These are the same compounds tied to lower rates of exactly the diseases that dominate modern mortality. A diet with no plants in it is not just missing fiber. It is missing almost the entire chemical class. What that gap does to inflammation is covered in the anti-inflammatory diet.

How much energy is lost when you eat animals instead of plants

There is a physics reason the middleman is so costly, and it is the second law of thermodynamics. Every time energy is converted from one form to another, some of it escapes as heat. Nothing in the universe transfers energy at 100 percent efficiency, and living things are no exception. Ecologists have a rule of thumb for this: at each step up a food chain, only about 10 percent of the energy carries over, while roughly 90 percent is burned off and lost. The exact figure varies, roughly 5 to 20 percent depending on the animal, but the direction never does. The loss itself is guaranteed by the second law.

Follow the chain. A plant captures energy from the sun. A cow eats the plant and loses about 90 percent of that energy just staying alive, standing up and walking around. Then a person eats the cow and loses about 90 percent again. By the time it reaches your plate as beef, you are recovering something on the order of one percent of the energy the plant first captured. Eat the plant directly and you skip an entire tier of that loss. The size of the loss is measured, not assumed, and the fact that there must be a loss is physics. It is the reason raising animals for food swallows so much more land, water and crop than feeding people plants directly. We work through what that means on the ground in the crop deaths math and the “livestock upcycle food we can’t eat” myth.

Fiber: the nutrient animal foods contain none of

What does fiber actually do for your body

Fiber feeds the bacteria in your gut, which ferment it into short-chain fatty acids like butyrate. Butyrate is the primary fuel for the cells lining your colon. This is a direct mechanical link between eating plants and a healthy gut, and it is a link a meat-only diet severs completely, because animal foods contain zero fiber.

How much fiber lowers your risk of dying

A synthesis commissioned by the World Health Organization pooled 185 prospective studies and 58 clinical trials. Comparing the highest fiber eaters with the lowest, the cohort data showed 15 to 30 percent lower all-cause and cardiovascular death, and 16 to 24 percent lower rates of heart disease, stroke, type 2 diabetes and colorectal cancer. The biggest benefit showed up at 25 to 29 grams a day, and the dose-response curves suggested more could help further (The Lancet, 2019). The cohort findings are observational, but the trials in the same paper backed them up with lower body weight, blood pressure and cholesterol on higher fiber. For context, the authors note most people worldwide eat less than 20 grams a day, and only about seven percent of American adults hit the target (American Society for Nutrition). A carnivore diet does not just fall short here. It scores a structural zero on one of the dietary factors most consistently linked to living longer.

Saturated fat, LDL cholesterol and your heart

Is LDL cholesterol really the cause of heart disease

This is as settled as nutrition gets. A consensus panel of the European Atherosclerosis Society weighed more than 200 studies covering over two million people, from genetics to cohorts to randomized trials, and concluded that LDL does not merely correlate with heart disease, it causes it, in a dose-dependent relationship that grows with how many years you are exposed. Its summary for treatment: the lower the LDL reached, the greater the benefit (European Heart Journal, 2017). The genetic evidence is the clincher. Variants in more than 50 genes that lower LDL also lower heart disease risk in proportion, across whole lifetimes, which rules out the “it is just a marker” dodge. The particle count itself is tracked by apolipoprotein B: every LDL particle carries exactly one apoB molecule, and the panel notes apoB can reflect risk more accurately than LDL cholesterol when the two disagree, as they can in diabetes and metabolic syndrome. That is the number the rest of this section keeps coming back to.

Didn’t studies clear saturated fat

You heard about a couple of meta-analyses that found no overall link, and carnivore advocates cite them constantly. The catch is what saturated fat was being compared against. In those analyses it was often swapped for refined carbohydrates, which are also harmful, so the two washed each other out. When saturated fat is replaced specifically with unsaturated fat from plants, heart events fall. When it is replaced with white bread and sugar, they do not. What you replace it with is the entire question, and the answer points at whole plant foods, not butter and not white flour. We cover saturated fat and seed oils in more depth in our saturated fat and seed oils post.

What about the keto study that said high LDL was fine

You may see a 2025 study on “lean mass hyper-responders” passed around as proof that sky-high LDL on a low-carb diet does not build plaque. Be careful with that one, because the full story is worse for that claim than the short version. The paper, subtitled “Plaque Predicts Plaque, ApoB Does Not,” scanned 100 people whose LDL had shot up on a ketogenic diet while they stayed lean and otherwise healthy, and it was promoted as a paradigm shift. The paper reported its pre-registered primary result, soft plaque volume, only as an absolute change, and left out how large that change was relative to where people started. A May 2025 letter from other researchers called this out as selective reporting. Pressed to answer, the authors admitted in print that they had left out a 42.8 percent relative increase in soft plaque over the year, calling it “a sincere oversight,” and added that their results “are compatible with a causal role of apolipoprotein B in atherosclerosis” (authors’ reply, JACC: Advances, 2025). Read that twice: the study sold as proof ApoB does not matter says, in its own authors’ words, that its results are compatible with ApoB causing heart disease.

Then came the conflict of interest. The scans had been analyzed by a company called Cleerly, and one of the paper’s coauthors was Cleerly’s chief medical officer at the time. The journal later confirmed he had disclosed that affiliation when the paper was submitted and told them he held equity in the company once the paper was accepted, but the published paper listed only the job title, not the ownership stake (Retraction Watch, 2026). The paper was pulled on March 11, 2026, with the journal stating plainly that “the identified errors are too great to be corrected with a corrigendum” (retraction notice, JACC: Advances).

Did the reanalysis rescue the study

Not really. The same team went back with a different, unconflicted company running the scans, blind to which patient was which, and reported the results as a preprint. Soft plaque still grew: a median increase of 5.6 cubic millimetres, a 37 percent rise in a year, smaller than the original discredited figure but still a real, measurable increase in the exact tissue that ruptures and causes heart attacks (Budoff et al., medRxiv preprint, 2026). Within that specific group, where everyone already had extremely high LDL by design, ApoB levels still did not predict which patients grew more plaque than others. That is a real finding, but notice what it can and cannot support: it is a bit like finding that height does not predict basketball skill in a room that only contains seven-footers. It says nothing about whether the LDL got them into the room in the first place, and the total-population evidence in the rest of this section says it does. What both the flawed original analysis and the later independent one agree on, despite everything else in dispute, is the plaque itself. It grew.

Do plant-based diets lower cholesterol

Reliably, and by a lot. Pooling 30 randomized trials and about 2,400 participants, vegetarian and vegan diets lowered total cholesterol by about 7 percent, LDL by about 10 percent, and apolipoprotein B, the particle count described above, by about 14 percent compared with omnivorous diets (Koch et al., European Heart Journal, 2023). That links the two halves of the argument: randomized evidence that cutting out meat, or all animal products, lowers the particle the consensus panel identified as the cause. One honest caveat: the apoB figure rests on just six of the trials, and the authors themselves say to read it with care. The Portfolio diet, a plant-based pattern built around soy, nuts, viscous fiber and plant sterols, lowered LDL by around 30 percent under controlled conditions, in the range of a starting statin dose (JAMA, 2003). A clever Stanford study put genetically identical twins on either a healthy vegan or a healthy omnivore diet for eight weeks; the vegan twin ended up with meaningfully lower LDL and fasting insulin than their own sibling, controlling for genes and upbringing (JAMA Network Open, 2023).

Does it matter if a low-carb diet is built on animals or plants

Enormously, and this is the cleanest natural experiment available on the entire carnivore question, because it holds the macronutrient label constant and changes only where the calories came from. In the Nurses’ Health Study and Health Professionals Follow-up Study, a low-carbohydrate score built on animal foods was associated with 23 percent higher all-cause mortality, while the same low-carb score built on plant foods was associated with 20 percent lower all-cause mortality and 23 percent lower cardiovascular mortality. A separate cohort plus a meta-analysis of 432,000 people found the identical split from the other direction: replacing carbohydrate with animal fat or protein raised mortality by 18 percent, replacing it with plant fat or protein lowered mortality by 18 percent. And in the CARDIA cohort, followed with imaging rather than death certificates from young adulthood into middle age, a higher low-carbohydrate score was tied to faster buildup of coronary artery calcium, the calcified plaque that marks advancing heart disease, and that buildup was driven specifically by the animal-based version of the pattern rather than the plant-based one. Same diet name, opposite outcomes on the actual arteries. If carbohydrate restriction itself were the active ingredient, none of these studies could come out this way. Carnivore is, definitionally, the animal-based version of this natural experiment taken to its limit.

Is white meat better than red meat for cholesterol

Not really, and this one surprises people. The APPROACH feeding trial compared red meat, white meat and non-meat plant protein head to head and found red and white meat raised LDL about equally, while plant protein beat both (American Journal of Clinical Nutrition, 2019). Swapping beef for chicken is not the fix people think it is. And in a six-week randomized trial, partly replacing red and processed meat with legumes lowered total and LDL cholesterol in the legume group while both rose in the meat group, with the legume eaters also losing more weight and keeping adequate B12, iodine and iron status (European Journal of Nutrition, 2025).

What the evidence says about red and processed meat

Is processed meat really a carcinogen

The World Health Organization’s cancer agency classifies processed meat as a Group 1 carcinogen, the same confidence category as tobacco smoke for the strength of the evidence, though not the same size of risk, based on its link to colorectal cancer. Red meat sits one rung down as “probably carcinogenic” (WHO Q&A). If you have seen the viral claim that a 2026 pooled analysis found 40 percent more colorectal cancer in vegans, and that this overturns the meat link, it does not. That number rests on only 93 cases among vegans, and the paper’s own authors say it should be interpreted with caution (Dunneram et al., British Journal of Cancer, 2026). We take it apart in why a 40 percent number in one subgroup did not overturn the meat and bowel cancer link, and the full evidence on diet and bowel cancer is in our colorectal cancer post.

Does eating meat raise diabetes risk

A federated analysis of nearly two million adults across twenty countries found that a modest daily serving of processed meat was linked to 15 percent higher type 2 diabetes risk, and unprocessed red meat to 10 percent higher (The Lancet Diabetes and Endocrinology, 2024). If weight and blood sugar are your concern, our plant-based weight loss guide covers the practical steps.

What is TMAO and why does it matter

When gut bacteria digest carnitine, which is abundant in red meat, some of them produce trimethylamine, which your liver oxidizes into TMAO, a compound that accelerates artery disease in animal studies. The striking part of the original experiment was not the chemistry, it was the comparison: give long-term meat eaters and long-term plant eaters an identical dose of carnitine, and the plant eaters barely produce any TMAO at all, because they have never cultivated the specific bacteria that make it (Nature Medicine, 2013). One honest caveat belongs here: TMAO has real critics who argue it is a marker of overall diet and gut ecology rather than an independent driver of disease, pointing out that fish itself contains preformed TMAO without an obvious penalty. Treat it as one plausible piece of a converging picture rather than as proof standing alone.

What is better established is the flip side of this same ecosystem: what happens when you take fermentable carbohydrate away rather than adding meat. In controlled studies, cutting carbohydrate intake measurably reduced fecal butyrate concentrations and the abundance of the bacteria that produce it, because those bacteria eat fiber and there was less of it to eat. A meat-heavy, fiber-poor diet does not just risk feeding TMAO-producing bacteria on one side. It starves the butyrate-producing ones on the other, which is the same gut ecosystem shift working from two directions at once.

What happens to people who actually eat this way

Do vegans and vegetarians live longer

In the large Adventist Health Study-2, all vegetarians combined had lower overall death rates than meat-eaters, with an adjusted hazard ratio of 0.88 across 73,308 participants (JAMA Internal Medicine, 2013). Being precise matters here: the vegan-specific mortality estimate of 0.85 trended the same way but did not reach statistical significance on its own, so anyone claiming this study proves vegans outlive everyone is overreading it. Where the vegan signal is robust in that cohort is cardiometabolic. Type 2 diabetes prevalence ran 2.9 percent in vegans against 7.6 percent in non-vegetarians, an adjusted odds ratio of 0.51 even after correcting for body weight, and vegans had markedly less hypertension (Tonstad et al., Diabetes Care, 2009). We break this cohort down in our Adventist Health article, and look at long-lived populations generally in what the longest-living people eat.

Didn’t one study show vegetarians have more strokes

Yes, and honesty matters here. The British EPIC-Oxford cohort found vegetarians had about 22 percent less heart disease but around 20 percent more stroke over eighteen years (BMJ, 2019). In absolute terms that worked out to 10 fewer heart disease cases and 3 more strokes per 1,000 people over ten years. One leading hypothesis is poor vitamin B12 status, which is fixable with a cheap supplement rather than a burger; low total cholesterol has also been proposed, since the excess was mainly hemorrhagic stroke. Worth knowing too: the vegan-specific hemorrhagic stroke numbers rested on only a handful of events, so they cannot carry much weight. And the finding has not consistently replicated: later cohorts in Taiwan and the United States found vegetarians had the same or lower stroke risk. Even in EPIC-Oxford itself, the much larger drop in heart disease meant vegetarians came out ahead on total cardiovascular disease. This is a footnote in favor of supplementing B12, not an argument for eating animals.

Can a plant-based diet improve type 2 diabetes and heart disease

Randomized trials of low-fat vegan diets show larger drops in blood sugar, more weight loss and bigger LDL reductions than conventional diabetes diets (Diabetes Care, 2006). Diet is doing real clinical work here, not just trimming a risk score. Ornish’s Lifestyle Heart Trial went further still, showing measurable regression of coronary artery narrowing on a plant-based program without cholesterol-lowering drugs, while the control group progressed.

Why can you eat until full on plants and still lose weight

Because fiber and water dilute the calories. On a metabolic ward where every calorie was measured, people eating a minimally processed, low-fat, plant-based diet spontaneously ate about 689 fewer calories a day than the same people on an animal-based ketogenic diet, with no difference in reported hunger or meal enjoyment (Hall et al., Nature Medicine, 2021). That is the whole argument of our plant-based weight loss guide: you can eat until comfortably full and still run a deficit.

What about the Blue Zones controversy

You may have seen a researcher named Saul Newman argue that the Blue Zone longevity claims rest on shaky record-keeping. He raises fair points about data quality, and we take them seriously rather than hand-waving them away in our Newman fact-check and our broader look at whether the Blue Zones are debunked. The case for plants does not depend on the Blue Zones. It stands on the controlled trials and the mechanistic evidence above.

The honest gaps: B12 and a few nutrients to plan for

Where does B12 actually come from

Here is a fact that reframes the whole debate. B12 is not made by plants, and it is not made by animals either. It is made by bacteria. Animals only carry B12 because microbes in their gut or their feed produce it, and modern farmed livestock are routinely given cobalt and B12 supplements to keep their levels up (review of cobalt and B12 in cattle; Watanabe and Bito, 2018). So a great deal of the B12 in the meat supply traces back to supplementing livestock in the first place. Vegans just cut out the animal and take it directly. Being upfront about this makes the position stronger, not weaker, and we cover the details in our full B12 guide.

What else should a vegan plan for

A well-planned vegan diet needs deliberate sources of B12 (a supplement, non-negotiable), iodine, vitamin D, and attention to iron, zinc and calcium, with daily ALA from ground flax, chia or walnuts and an optional algal omega-3 if you want the insurance. Iodine has the easiest fix on the whole list: a partial sheet of nori a few times a week, or a pinch of iodized salt, covers it. Kelp and kombu are the ones to go light on, since they can deliver iodine many times over the adult safe upper limit (National Academies, 2001). Vitamin D is barely a vegan issue at all. It runs low across every diet in low-sun conditions, which is exactly why it gets added at the factory to dairy milk and to fortified plant milk alike; a vegan drinking fortified soy or oat milk is doing precisely what a dairy drinker is doing, just without the cow in between, and a supplement covers the rest of the year. Note the order there: B12 is the one truly non-negotiable item, iodine and vitamin D are easy and population-wide rather than vegan-specific, and calcium deserves more attention than it usually gets, for reasons the next section makes clear. That leaves the omega-3 question, the one that gets all the airtime, as genuinely the smallest concern on this list. None of this is exotic; it is a short checklist, and the major dietetic associations affirm that a well-planned vegan diet is adequate for adults, with the British Dietetic Association and others extending that to every life stage including childhood. If you are feeding a family this way, start with raising children vegan.

Do vegans have weaker bones

This is the one concession in this section that takes real work to earn, so it gets a straight answer rather than a dodge. Vegans in the best long-term cohorts really do break more hips. A 2025 meta-analysis of four cohorts and more than half a million people, 5,344 of them vegan, put the vegan hazard ratio at 1.75, roughly 8 extra hip fractures per 1,000 people (Ballarin et al., Nutrition Reviews, 2025). All four cohorts leaned the same way, though only two of the four vegan estimates were significant on their own, and three of the four were British. The authors graded their vegan estimate “very low certainty,” and its confidence interval runs from a 17 percent to a 163 percent increase. The size is uncertain; the direction is not seriously in dispute.

What is worth knowing is what drives it, and protein is not the main suspect. In EPIC-Oxford, where the vegans averaged 591 mg of calcium a day against 1,005 mg in meat eaters, adjusting for dietary calcium shrank the vegan hip-fracture hazard ratio from 2.31 to 1.97, while adjusting for protein only moved it to 2.21. That is roughly a quarter of the excess for calcium and under a tenth for protein. Restricting the analysis to vegans already eating adequate protein did not lower their risk at all (Tong et al., BMC Medicine, 2020). Even after both adjustments a gap remained, and the authors had no data on calcium supplements, so something else is also at work. In the Adventist Health Study-2, vegan women taking neither calcium nor vitamin D supplements had nearly triple the hip fracture risk, while vegan women taking both had no greater risk than meat eaters. Men showed no link between diet and hip fracture at all (Thorpe et al., American Journal of Clinical Nutrition, 2021). The bone density gap itself is smaller than the fracture gap, and the EPIC-Oxford authors cite work suggesting much of it reflects vegans simply weighing less.

There is also a second lever that closes what is left, and it has nothing to do with food. A detailed bone-microarchitecture study found vegans who did resistance training were structurally indistinguishable from omnivores who trained, while vegans who skipped resistance training showed measurably worse bone structure that nutrient intake alone did not explain (Wakolbinger-Habel et al., 2022). So the fix has two parts, and neither one is a hamburger: get roughly 1,000 mg of calcium a day from fortified plant milk, calcium-set tofu and low-oxalate greens like kale and bok choy, take vitamin D if sun exposure is limited, and lift something heavy twice a week. In the Adventist cohort, calcium plus vitamin D alone erased the excess in women. We go through the full calcium, exercise and supplement playbook, doses and all, in our complete guide to vegan bone health.

What the carnivore diet can actually show for itself

Is there any real research on the carnivore diet

Almost none, and we now have a formal count. A 2026 scoping review searched four major databases for every human study of the carnivore diet published from 1970 through 2025 and found nine, all from 2021 onward: five case reports or case series, two social media surveys, one small exploratory study and one modeling exercise. None reported a clinical endpoint, and there are no prospective long-term cohorts. The reviewers concluded that long-term adherence to a carnivore diet “cannot be recommended” (Lietz et al., Nutrients, 2026).

The flagship “study” carnivore advocates cite is the largest of those nine, an online survey of about 2,000 self-selected enthusiasts who reported feeling great (Lennerz et al., 2021). There was no control group, and an obvious survivorship problem: anyone who felt awful and quit was never counted. Its one hard number went the wrong way. As summarized in the scoping review, self-reported LDL rose from 126 to 172 mg/dL on the diet. The reviewers suggest the improvements people describe are likely driven by subjective perception, placebo and the effects of ketosis rather than anything unique to meat. Compare that to the mountain of controlled and cohort data behind plant-based eating and the asymmetry is stark. We take the “millions of people say it worked” argument apart in why testimonials are not evidence, and explain why the definitive long-term carnivore trial has never been run in the carnivore research gap.

What nutrients does an all-meat diet miss

The scoping review flagged likely shortfalls in vitamin C, vitamin D, calcium, magnesium, iodine and fiber, with modeled all-meat meal plans delivering under a gram of fiber a day against a target of 25 to 30 (Lietz et al., 2026). Add the entire universe of plant phytochemicals, which is simply absent. One honest correction to a popular vegan talking point: carnivore dieters are not dropping from scurvy. Meat contains very little vitamin C, but the same review notes no clinical cases of scurvy tied to the diet have been reported, and traditional Inuit avoided it by eating fresh and raw organs, which is not the same as a plate of cooked steak. The case against the diet does not need bleeding gums; it rests on zero fiber and rising LDL. We take the Inuit and the Maasai apart in the ancestral diet argument and cover raw animal foods in raw and cooked. And if the pitch is that plants are full of toxins and antinutrients, we handle that head-on in plant toxins and antinutrients.

Are humans built to be apex predators

Our own genome argues otherwise, and vitamin C is the giveaway. Most mammals manufacture their own vitamin C. Our lineage carries a broken GULO gene and cannot make any, which makes the most evolutionary sense if our distant primate ancestors had a dependable dietary supply for a very long time. Add expanded salivary amylase gene copies for digesting starch, a colon adapted to fermenting plant fiber, and 25 functional bitter taste receptors. Obligate carnivores look nothing like that: cats still make their own vitamin C, lack the amylase expansion, and have a shrunken bitter-taste repertoire with no sweet taste at all. None of that proves humans cannot survive on meat; the Inuit show people can. It shows a body shaped by a long history of eating plants, which is a very different thing from a body built for an all-meat diet. The deeper version is in what we actually evolved to eat.

Why does no medical body recommend a meat-only diet

Step back and notice the asymmetry. Pediatric, cardiology, oncology, diabetes and dietetic organizations across four continents affirm well-planned plant-based eating. Plant-based nutrition has entire evidence-based medical organizations built around it, and the Ornish program for reversing heart disease has been Medicare-covered since 2010. Low-carb medicine does have a professional body, the Society of Metabolic Health Practitioners, so this is not a case of no organization existing at all. But there is no professional body dedicated to a meat-only diet, no major health organization anywhere that recommends one, and no Medicare-covered program built on meat. Where omnivorous patterns do earn official endorsement, like the Mediterranean and DASH diets, they earn it precisely for being plant-forward and for telling people to cut red and processed meat. The reason is not a conspiracy. Position papers require evidence, and the evidence has to exist first.

The planet and the animals

How much land and emissions does meat really cost

The largest food-system analysis ever assembled, covering roughly 38,000 farms, found that animal products deliver only about 18 percent of the world’s calories while using around 83 percent of its farmland, and generating well over half of food’s greenhouse emissions. Moving to plant-based eating could cut global farmland use by more than 75 percent and still feed everyone (Poore and Nemecek, Science, 2018). The 2025 update to the EAT-Lancet planetary health work estimates that a plant-rich diet carries roughly 27 percent lower risk of early death while fitting inside the planet’s limits (the 2025 EAT-Lancet Commission, The Lancet).

What about the crop deaths argument

The claim that plant farming kills more animals collapses on arithmetic: livestock eat far more crops than they return as food, so feeding animals grows more fields, not fewer. We lay out the numbers in the crop deaths math and the “livestock upcycle food we can’t eat” myth. For the regenerative and rewilding counterpoints, see regenerative farming, rewilding, and the pesticide argument the carnivore movement can’t answer.

When policy and science disagree

Didn’t the new 2025 guidelines push meat and butter

They leaned that way, and it is worth being honest about it. The 2025 to 2030 Dietary Guidelines for Americans, released in January 2026, kept the cap on saturated fat at under 10 percent of calories but simultaneously raised the protein target to 1.2 to 1.6 grams per kilogram a day, 50 to 100 percent above the National Academies’ own RDA, and presented butter and beef tallow as acceptable fats. The tell is what the government’s own scientists had advised. The 2025 Dietary Guidelines Advisory Committee recommended emphasizing beans, peas and lentils while reducing red and processed meats, and proposed reordering the protein group to list beans, peas and lentils first and meats, poultry and eggs last. On saturated fat, it found that replacing butter, red and processed meat and dairy with plant foods was associated with lower cardiovascular risk, while swapping one animal source of saturated fat for another showed a general lack of benefit (Scientific Report of the 2025 Dietary Guidelines Advisory Committee). The published guidelines went the other way. Cardiologists and nutrition scientists pointed out the saturated fat contradiction immediately, too. The American College of Cardiology warned the new graphic could be read as an upside-down pyramid with steak and cheese on top and said the evidence does not support promoting butter or tallow (ACC review, 2026). Harvard’s nutrition department called the mixed messaging likely to raise saturated fat intake and cardiovascular risk (Harvard Nutrition Source). The key point: a guideline is a policy document, and a committee’s own findings can be overruled in the final draft. The underlying biochemistry of LDL, ApoB and saturated fat did not change because a final document did. When the politics and the physiology diverge, follow the physiology.

The bottom line

There are no essential sugars. That is true, and you can concede it cheerfully, because it changes nothing. There are also no essential saturated fats, no essential cholesterol, and no essential red meat. “Essential” only ever meant “your body can’t make it,” never “you should build your diet around it.” The organization that carnivore advocates lean on to define the word turns around and sets ranges and targets that point to a plate that is mostly plants, rich in fiber, and low in the fats that raise LDL. The controlled trials, the genetic evidence and the population data all pull in the same direction. A well-planned vegan diet is not the fragile, deficient thing it gets painted as. It is the pattern the science keeps landing on, and what it asks in return is a short list: a B12 supplement, reliable iodine and vitamin D, enough calcium, some beans every day, and something heavy to lift now and then.

Sources

Last updated: October 6, 2026 at 8:53 AM EDT