Ten Animal Foods That Aren’t As Good As You Think

What you’re getting yourself into

Not all animal foods are created equal. Some are genuinely excellent. Others are coasting on a reputation they haven’t earned, and a handful are actively working against you while you congratulate yourself for choosing them.

There’s a comfortable assumption that runs through a lot of health-conscious eating, and it goes something like this: if it came from an animal, you’re already winning. Ditch the seed oils, drop the processed carbs, eat more meat. Job done.

That’s not wrong as a starting point. Animal foods are, broadly speaking, the most nutritionally complete foods available to us. But broad strokes have a way of flattening the details, and the details here matter. Not all animal foods are built the same. Some are genuinely excellent. Others are coasting on a reputation they haven’t quite earned, and a handful are actively working against you while you congratulate yourself for choosing them.

This isn’t an argument against animal foods. It’s an argument for being a more discerning consumer of them. Here are ten that deserve a harder look.

1. Farmed Salmon

Wild salmon is legitimately one of the best foods on the planet. Cold water, natural prey, a fat profile rich in omega-3s. Farmed salmon is a different animal in almost every meaningful sense, and the fact that it wears the same name is doing a lot of heavy lifting.

The problem starts with the feed. Farmed salmon are raised on a diet of soy, corn, and various grain-derived pellets, because the ocean isn’t on hand and fishmeal is expensive. This shifts the fat composition of the fish dramatically. Where wild salmon accumulates omega-3 fatty acids through its natural diet of smaller fish and krill, farmed salmon picks up the omega-6 profile of whatever grain it’s been fed. The result is a fish with a far higher omega-6 to omega-3 ratio than the label implies.

This matters because excess omega-6, particularly linoleic acid from grain sources, is one of the central drivers of chronic inflammation that underlies most modern metabolic disease. You are what you eat, and salmon eat what they’re fed.

Then there’s the colour. Wild salmon is deep pink because of astaxanthin, a powerful antioxidant it gets from krill. Farmed salmon, lacking access to krill, is naturally a pallid grey. The industry fixes this with synthetic astaxanthin added to the feed pellets, which produces the expected colour without the nutritional provenance. You’re essentially buying a fish that’s been dyed to look like a better version of itself.

There’s also the matter of persistent organic pollutants. Farmed fish are raised in dense net pens in coastal waters, accumulating contaminants at rates higher than their wild counterparts. Studies have repeatedly found elevated levels of PCBs and dioxins in farmed salmon compared to wild-caught alternatives.

Wild salmon, sardines, and mackerel remain excellent choices. Farmed salmon is expensive, inferior, and wearing a halo it doesn’t deserve.

2. Chicken Thighs

Chicken thighs get held up as the more flavourful, fattier alternative to breast, and they are, which is something. The problem is where that fat comes from.

Unlike ruminants, which convert their feed into saturated fat through the process of biohydrogenation in their rumen, monogastric animals like chickens deposit dietary fat more or less as they find it. Feed a chicken a grain-heavy diet, and the bird’s fat will reflect that. Thighs, being the fattier cut, end up carrying a higher load of polyunsaturated fat than breast meat, and specifically the omega-6 linoleic acid that’s abundant in the corn and soy that make up the bulk of commercial chicken feed.

Polyunsaturated fats are chemically unstable. They oxidise readily, both in the bird’s tissues and when exposed to heat during cooking. Oxidised linoleic acid generates a cascade of reactive compounds that promote inflammation, damage mitochondria, and have been increasingly linked to the metabolic disruption that sits behind most modern chronic disease. The seed oil problem and the chicken thigh problem are essentially the same problem wearing different packaging.

Pasture-raised chicken, eating insects and grass alongside minimal grain, has a meaningfully better fat profile. But it’s considerably harder to find, considerably more expensive, and rarely what’s sitting in the supermarket fridge under a health claim.

If you’re going to eat chicken regularly, breast at least limits the damage by limiting the fat. Thighs taste better, but the fat they carry is not the fat you want in abundance.

3. Chicken Breast

Chicken breast is the official protein of anyone who has ever stood in a gym, listened to a podcast about macros, or been told by a dietitian to eat more lean protein. It is everywhere. It is boring. And while it isn’t actively harmful in the way thighs can be, it is a deeply uninspiring food that has been elevated far beyond its station.

The issue isn’t what chicken breast contains. It’s what it doesn’t. Strip out the fat, and you strip out the fat-soluble vitamins that travel with it. Vitamins A, D, E, and K2 are not present in meaningful quantities in lean muscle meat. The micronutrient profile of chicken breast, compared to a fatty ruminant cut, is sparse. A little zinc, some B vitamins, adequate protein. That’s roughly where the highlight reel ends.

Fat also does something that protein cannot: it sustains you. The satiety that comes from a meal built around fatty meat is qualitatively different from the kind that comes from a chicken breast. One keeps you full for hours. The other has you rummaging through the kitchen ninety minutes later, confused and irritable.

There’s also digestion to consider. Fat acts as a lubricant for the digestive process, slowing gastric emptying, stimulating bile production, and improving the absorption of fat-soluble compounds. A dry breast eaten without fat is not a complete meal in any meaningful metabolic sense.

Chicken breast is not a terrible food. It’s a mediocre one that has been mistaken for an excellent one because it has low fat and high protein, which is what the last fifty years of nutritional guidance told us to optimise for. We were wrong about that, and chicken breast is one of the casualties of the confusion.

4. Canned Tuna

Canned tuna has earned its place in the cultural imagination as the hardworking protein of people who are too busy to cook and too sensible to eat a sandwich. It’s cheap, it’s convenient, and it has a reasonable protein content. It is also, nutritionally speaking, one of the least interesting ways to meet your daily requirements.

Tuna is a lean fish. This is often presented as a virtue. It isn’t. Fat in animal food is not a problem to be engineered away; it’s where much of the nutritional value lives. A tin of tuna in spring water gives you protein and not a great deal else. No meaningful fat-soluble vitamins, negligible omega-3s relative to fatty fish, and a caloric density that makes it difficult to reach satiety without eating a discouraging quantity of the stuff.

Then there’s the mercury question. Tuna, being a large predatory fish with a long lifespan, accumulates methylmercury through the food chain in a process called bioaccumulation. Each fish it eats brings a dose of mercury with it, which the tuna stores in its tissues rather than excreting efficiently. Canned light tuna carries less than albacore, but regular consumption of any canned tuna adds up over time, particularly for women of childbearing age and children, for whom mercury exposure carries the most significant neurological risk.

Sardines are the obvious alternative, and in almost every respect a superior product. They’re eaten whole, which means you get the bones (calcium), the organs, and the fat in roughly the proportions nature intended. They’re small enough that mercury accumulation is negligible. And they’re cheaper. The only argument for tuna over sardines is that tuna is blander, which is, if anything, a point against it.

5. Oysters

Oysters occupy a somewhat hallowed position in ancestral health circles, celebrated for their zinc and copper content, their mineral density, and the fact that harvesting them requires no animal to be slaughtered, which makes them a useful deflection in arguments with vegetarians. The enthusiasm is partially deserved. The devotion is not.

The problem with oysters begins with what they are: filter feeders. An oyster’s entire biological purpose is to draw water through its body and extract whatever is suspended in it. In a clean estuary, that’s plankton and minerals. In a busy harbour with agricultural runoff, industrial discharge, and inadequate sewage management, that’s rather more than plankton and minerals. Oysters accumulate heavy metals, bacteria, viruses, and agricultural chemicals with the same efficient enthusiasm with which they accumulate zinc.

Sourcing matters enormously with oysters, and it is genuinely difficult to verify. The distance between a clean-water oyster and one raised in a compromised estuary is nutritionally significant, but the shell looks identical and the vendor is rarely forthcoming about the finer details of their water quality monitoring. ‘Sustainably sourced’ on a menu tells you approximately nothing about the microbiological content of what you’re about to swallow.

There’s also the micronutrient loading to consider. Oysters are extraordinarily high in both zinc and copper, which is fine in the context of occasional consumption. Eaten regularly, as some ancestral health devotees advocate, the ratio between these two minerals can drift in ways that create problems elsewhere. Zinc and copper compete for absorption, and the balance matters. Very high copper intake, sustained over time, can accumulate in the liver and contribute to toxicity, a concern that applies to organ meat enthusiasts as well.

Eat oysters occasionally, from a source you trust, and enjoy them. But the carnivore community’s tendency to treat them as a nutritional superfood to be consumed with regularity deserves some scepticism.

6. Liver

Liver has excellent PR. It is genuinely one of the most nutrient-dense foods available, packed with B vitamins, iron, and preformed vitamin A in concentrations that no plant food can touch. The ancestral health community has, correctly, pushed back against decades of liver-avoidance driven by cholesterol panic. But in doing so, it has overcorrected into treating liver as a food that can be eaten daily without consequence, which is not the case.

The issue is vitamin A and copper, both of which accumulate in the body’s tissues rather than being readily excreted. Preformed vitamin A, the kind found in liver and absent from plants, is fat-soluble. The body stores it in the liver, and those stores build up over time. Chronic excess leads to a condition called hypervitaminosis A, the symptoms of which include bone pain, headaches, hair loss, liver damage, and a range of other complaints that bear an unfortunate resemblance to the deficiency diseases liver is supposed to prevent. Copper accumulation follows a similar logic.

The historical evidence on this point is illuminating. Arctic explorers learned the hard way that the liver of polar bears and huskies, consumed in quantity, was acutely toxic. But the more instructive observation came from the Inuit themselves, who were the most experienced consumers of animal foods on the planet. They ate liver, but they did not eat it with the enthusiasm of someone who had just discovered an ancestral superfood. They treated it with the respect owed to a potent substance, consuming it sparingly and selectively, and they reportedly tried to discourage early explorers from eating it in excess.

That instinct was sound. A portion of liver once every few weeks provides a valuable top-up of nutrients that are difficult to obtain elsewhere. Daily liver consumption, particularly from beef, is a different proposition, and not one that the body’s storage mechanisms are well-equipped to handle indefinitely.

7. High-Mercury Seafood

The mercury problem that applies to canned tuna applies with even greater force to larger, longer-lived predatory fish. Swordfish, king mackerel, tilefish, and shark are the most frequently cited offenders, but the principle extends across any fish that sits at the top of a marine food chain and lives long enough to accumulate what’s been absorbed by everything below it.

Methylmercury, the organic form that accumulates in fish tissue, is a potent neurotoxin. At sufficient doses it damages the central nervous system, impairs cognitive function, and disrupts motor control. The doses required for acute poisoning are well above what most people would encounter through normal fish consumption. The concern with regular consumption of high-mercury species is chronic, low-level exposure, which is harder to measure and easier to overlook.

The neurological effects of chronic mercury exposure are subtle but real: cognitive fog, reduced processing speed, fine motor impairment, mood disturbance. These are not the kinds of symptoms that prompt a hospital visit or point obviously to a dietary cause. They’re the kind that accumulate slowly, get attributed to stress or ageing, and are never investigated for their actual origin.

The irony is that fish is genuinely one of the most valuable foods in a well-constructed diet, and avoiding it entirely on mercury grounds would be a significant nutritional error. The answer is not to stop eating fish. It’s to eat small, fatty fish that are too short-lived to accumulate meaningful mercury: sardines, mackerel, anchovies, herring. These give you the omega-3s, the minerals, the fat-soluble vitamins, and none of the neurotoxin. They’re cheaper, more sustainable, and in every meaningful nutritional respect, superior to the large predatory species that have become restaurant status symbols.

8. Lean Beef Cuts

Somewhere along the line, someone decided that the most desirable form of beef was the one with the least fat. Sirloin became a premium cut. Eye of round got marketed as the smart choice. The fillet achieved a kind of cultural prestige entirely disproportionate to its nutritional value. And ribeye, the cut that our ancestors would have fought over, got quietly repositioned as an indulgence for people who didn’t care about their health.

This is exactly backwards.

Fat in ruminant beef is not the same fat as the polyunsaturated fat in chicken or seed oils. Beef fat is predominantly saturated and monounsaturated, chemically stable, resistant to oxidation, and a rich source of fat-soluble vitamins, particularly if the animal was grass-fed. The fat marbled through a ribeye carries conjugated linoleic acid, stearic acid, oleic acid, and a range of fat-soluble compounds that simply do not exist in a fillet. Strip the fat away and you’re left with protein. Protein is important, but it is not a complete food.

The rabbit starvation literature makes this point with some force. Indigenous peoples and Arctic explorers who survived on lean protein alone, without adequate fat, developed a characteristic cluster of symptoms: insatiable hunger despite eating, diarrhoea, headaches, and progressive weakness. The body can metabolise only a certain amount of protein without fat present to provide energy and metabolic cofactors. Exceed that limit, and the excess protein becomes a burden rather than a resource.

A lean beef cut is not a healthy choice. It’s a less complete version of a food that’s excellent when left intact. The fat is not optional. It is the point.

9. Non-Fat Greek Yogurt and Cottage Cheese

The low-fat dairy aisle represents one of the more durable legacies of a dietary mistake that has now been largely acknowledged as such. The fat hypothesis, which held that saturated fat caused heart disease and that removing it from foods made them healthier, has not survived scrutiny. But the products it spawned have outlasted the science that supposedly justified them, because they’re cheap to produce and people still feel virtuous eating them.

Non-fat Greek yogurt and low-fat cottage cheese are the fitness community’s preferred vehicles for protein consumption, and protein is indeed what they deliver. The problem is what got removed in the process. The fat in whole dairy is the vehicle for fat-soluble vitamins A, D, E, and K2. Remove the fat, and those vitamins go with it. What you’re left with is a high-protein food with a stripped nutritional profile, often with added sugar or artificial sweeteners included to compensate for the flavour that the fat used to provide.

Full-fat dairy has a substantially better case for inclusion in a healthy diet. The fat slows digestion, improves satiety, enables the absorption of the fat-soluble vitamins, and makes the food actually palatable without requiring anything to be added. As covered in more detail in the dairy guide, full-fat versions of these same foods support metabolic health in ways that their stripped counterparts do not.

The decision to buy the non-fat version and congratulate yourself for it is one of the more stubborn nutritional habits to outlive its justification. The full-fat version is the food. The non-fat version is the food with half of it missing.

10. Egg Whites

The egg white omelette may be the single most spectacular act of nutritional self-sabotage that the fitness world has normalised. Someone looked at one of the most complete foods available to any human being and decided, based on decades of flawed fat and cholesterol science, to discard the part that contains the vast majority of the nutrition.

The egg white contains protein. That’s more or less where its contribution ends. The yolk, the part being avoided, contains vitamins A, D, E, K2, B12, folate, choline, lutein, zeaxanthin, and the cholesterol that the body uses to synthesise hormones, bile, and cell membranes. It contains the fat that carries those fat-soluble vitamins into circulation. It contains the lecithin that emulsifies the fat for digestion. It is, in every meaningful nutritional sense, the egg. The white is structural packaging.

There’s also a more immediate concern with egg whites consumed in quantity, particularly raw or lightly cooked. Raw egg whites contain avidin, a protein that binds biotin (vitamin B7) with remarkable tenacity and prevents its absorption. Biotin is essential for fat metabolism, skin integrity, and neurological function. Cooking denatures avidin, which removes the problem, but the egg white enthusiast who’s consuming large quantities of whites alongside inadequate yolks is running a low biotin risk regardless.

The cholesterol concern that drove the whole enterprise has been substantially walked back. Dietary cholesterol has minimal effect on blood cholesterol levels in the vast majority of people, and the mechanisms by which egg yolks were supposed to cause heart disease have not held up. Whole eggs, eaten in reasonable quantities, are one of the best foods available. Egg whites alone are an expensive, flavourless protein supplement that discards most of what made the original food worth eating.

What To Eat Instead

The common thread running through every entry on this list is the same: something valuable got removed, avoided, or never acquired in the first place, and what remains is a diminished version of what animal foods can actually offer.

The animal foods that genuinely earn their reputation are the ones left closest to how nature produced them. Fatty ruminant cuts, particularly ribeye, brisket, and short rib from grass-fed cattle, provide a nutritional profile that is effectively complete: stable saturated fat, fat-soluble vitamins, bioavailable minerals, and the energy density that keeps the body running without the constant refuelling that lean protein demands. Wild-caught fatty fish, sardines and mackerel in particular, deliver omega-3s, calcium, and vitamin D in a package that no supplement can replicate. Whole eggs are one of the most complete foods available to any mammal. Full-fat dairy, where it’s tolerated, adds variety and a rich source of K2 and conjugated linoleic acid.

These are not exciting revelations. They are the foods that humans have historically prized above all others: the fatty cut, the oily fish, the whole egg, the cream. The pattern of avoiding fat, choosing lean cuts, and treating animal foods as mere protein delivery systems is entirely modern, and it has not served us well.

Eating animal foods is a good start. Eating the right ones, in the right forms, takes it considerably further.

The Carnivore Foundations Series

This is part of an ongoing series on what to eat on carnivore, and why.

• The 10 Best Foods On The Carnivore Diet
• The Ultimate Checklist For Starting Carnivore
• You Can’t Do Carnivore Without High Fat
• What I’ve Changed My Mind On After Four Years On Carnivore

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