Cod: Nutrition Facts, Health Benefits, and the Complete Guide to the World’s Most Important White Fish

Cod is one of the most historically significant foods in human history — a statement that sounds dramatic but is entirely accurate. For centuries, preserved salt cod fed the populations of Europe, drove the economies of the North Atlantic, and was so economically valuable that wars were fought over fishing rights. The “Cod Wars” between Iceland and the United Kingdom in the 1950s–1970s — disputes over fishing zones in the North Atlantic — reshaped international maritime law. Entire cities from Lisbon to Boston to Bergen were built on cod.

Nutritionally, cod earns its reputation through a different kind of excellence than the dramatic headline numbers found in shellfish or organ meats. Cod’s story is one of exceptional protein purity — 23g of complete protein at just 105 calories and 0.8g of fat, with virtually zero carbohydrates. Combined with 60% of daily selenium, 50% of daily Vitamin B12, 23% of daily Vitamin B6, meaningful Vitamin D, and very low sodium — cod is one of the cleanest, most efficient protein sources available from any whole food.

Cod Nutrition Facts (per 100g, cooked)

Cod Nutrition Facts (per 180g serving — approximately one standard fillet)

A standard cod fillet weighs approximately 180g — the most common single-serving reference:

A single standard cod fillet provides 41.4g of complete protein at 189 calories — one of the most protein-efficient whole food meals available anywhere.

Vitamins in Cod (per 100g, cooked)

Standout: Cod provides a valuable trio of vitamins that work synergistically for health — Vitamin B12 at 50% DV (essential for neurological health and red blood cell formation), Vitamin B6 at 23% DV (essential for protein metabolism — directly relevant given cod’s protein content — and neurotransmitter synthesis), and Vitamin D at 11% DV. The B12-B6 combination is particularly important for homocysteine metabolism — both vitamins are required to convert homocysteine to safer metabolites, reducing cardiovascular risk through this pathway. Niacin at 13% DV completes a comprehensive B vitamin contribution from a single lean protein source.

Minerals in Cod (per 100g, cooked)

Standout: Cod’s most impressive mineral figure is selenium at 60% DV per 100g — one of the highest selenium concentrations available from any commonly eaten food. A single standard fillet provides 108% of the daily selenium requirement. Cod is also a meaningful source of phosphorus (29% DV per 100g, 52% per fillet) for energy production and bone health, and magnesium (8% DV) for ATP production and muscle function — delivered at just 105 calories per 100g.

Cod’s Defining Nutritional Characteristic: Extraordinary Protein Purity

The most important thing to understand about cod nutritionally is what makes it different from other protein sources — its remarkable combination of high protein, very low fat, zero carbohydrates, and low sodium at a minimal caloric cost.

The Protein-to-Calorie Ratio

Cod’s protein-to-calorie ratio competes directly with the leanest protein foods available — including chicken breast, tuna, and even whey protein isolate. For anyone managing total calorie intake while maximizing protein consumption, cod is one of the most efficient whole food protein sources available.

Why the Fat Profile Matters

With just 0.8g of total fat per 100g — of which only 0.1g is saturated — cod is one of the leanest animal protein sources in existence. This is not a limitation but a specific advantage in several contexts:

Calorie-restricted diets — during fat loss phases, every calorie counts. Cod’s minimal fat contribution means the vast majority of its 105 calories are protein calories — the most metabolically useful macronutrient for preserving muscle during a deficit.

Fat-controlled therapeutic diets — people following very low fat diets for medical reasons (certain pancreatic conditions, gallbladder issues) can consume cod freely as a protein source without the fat concerns associated with most animal proteins.

Flexible dieting — cod’s near-zero fat content allows the dietary fat budget to be spent on higher-quality, more flavorful fat sources (olive oil for cooking, avocado in a side salad, nuts as a snack) rather than being occupied by the protein source itself.

Macro precision — for competitive athletes, physique competitors, or anyone tracking macros with exactitude, cod’s essentially pure protein-and-water composition makes it one of the most predictable and precisely trackable protein sources available.

The Selenium Story: Why 60% DV Matters

Cod’s 60% DV of selenium per 100g — and 108% per standard fillet — makes it one of the most significant dietary selenium sources available from any lean protein.

What Selenium Does

Selenium is a trace mineral that functions primarily through selenium-containing proteins called selenoproteins:

Glutathione peroxidases (GPx) — the most important selenium-dependent antioxidant enzymes. These neutralise hydrogen peroxide and lipid peroxides throughout the body, protecting cell membranes, proteins, and DNA from oxidative damage. GPx activity directly limits the extent of exercise-induced oxidative damage and age-related cellular deterioration.

Thioredoxin reductases — essential for regenerating other antioxidant molecules including Vitamin C and maintaining the cellular redox environment that supports DNA repair and immune function.

Iodothyronine deiodinases — the enzymes that convert thyroid hormone T4 to active T3. Adequate selenium is required for optimal thyroid hormone activation — selenium deficiency impairs thyroid function independently of iodine status.

Selenoprotein P — the primary selenium transport protein in blood, with specific protective functions in the brain and testes.

Sperm function — selenium is concentrated in the mitochondrial capsule of sperm cells and is essential for sperm motility and male fertility.

Selenium from White Fish vs. Other Sources

Cod’s selenium comes from the fish’s marine food chain — selenium in ocean water is absorbed by marine organisms and concentrated up the food chain. White fish like cod accumulate less mercury than large predatory fish (since they are lower in the food chain) while still concentrating meaningful selenium levels — providing an excellent selenium-to-mercury safety profile compared to tuna or swordfish.

Vitamin D: Cod’s Underappreciated Contribution

At 11% of daily Vitamin D per 100g — and 20% per standard fillet — cod provides meaningful Vitamin D at a time when population-level deficiency is widespread.

Vitamin D from food sources is relatively rare — the primary source for most people is skin synthesis from UV-B sunlight exposure, which is limited by geography, season, time spent outdoors, sunscreen use, and skin pigmentation. Food sources of Vitamin D are limited primarily to fatty fish (salmon, mackerel, herring have much higher amounts), fortified foods, and egg yolks — with cod providing a meaningful contribution from a lean fish.

While cod’s Vitamin D contribution (11% DV per 100g) is lower than fatty fish, it adds to the dietary Vitamin D from all sources — important given that adequate Vitamin D is essential for calcium absorption, bone mineralization, immune function, muscle function, and the cardiometabolic health outcomes consistently associated with Vitamin D sufficiency.

Cod Liver Oil: The Historical Health Supplement

No discussion of cod’s nutritional legacy is complete without cod liver oil — one of the most historically significant nutritional supplements in existence and the source of cod’s most concentrated nutritional value.

Cod liver oil — extracted from cod livers rather than the muscle flesh covered on this page — was used medicinally in Northern Europe for centuries before modern nutrition science existed. Norwegian fishermen observed that people who regularly consumed cod liver oil were healthier and more resilient to disease than those who didn’t — an empirical observation later validated when the fat-soluble vitamins responsible for these effects were discovered.

What cod liver oil contains that cod flesh does not:

Cod liver is an organ — and like most organs, it concentrates fat-soluble vitamins that muscle flesh contains only in trace amounts:

Cod liver oil became the primary medical treatment for rickets (Vitamin D deficiency causing bone deformation in children) in the 19th and early 20th centuries — decades before Vitamin D itself was identified. It was also used for tuberculosis treatment, scurvy prevention, and general childhood health supplementation throughout Europe and North America.

The discovery of Vitamins A and D in the early 20th century vindicated centuries of empirical cod liver oil use — and modern cod liver oil supplements continue to provide a concentrated source of Vitamin D, Vitamin A, and EPA/DHA omega-3 fatty acids.

Important note on cod liver oil vs. cod fish oil: These are different products. Cod liver oil comes from the liver and contains high Vitamin A and D alongside omega-3. Regular fish oil (from the body of fish) contains omega-3 without the concentrated fat-soluble vitamins. Both are legitimate supplements with different applications.

The Historical Significance of Cod

The cod’s role in shaping human history is genuinely extraordinary — making it worth addressing briefly on a nutrition page because it contextualizes the food in a way that few other fish can match.

Cod and the Age of Exploration

Before refrigeration, fresh protein over long sea voyages was impossible. Salt cod — cod dried and preserved in salt — solved this problem. It could be stored for months or years without refrigeration, was light enough to carry in large quantities, and provided protein dense enough to sustain sailors on ocean crossings.

Salt cod was a critical enabler of the Age of Exploration — provisioning the ships of Columbus, Cabot, Cartier, and Vespucci on their trans-Atlantic voyages. The Basque fishing fleets were harvesting cod from the Grand Banks of Newfoundland before Columbus’s first voyage, returning to Europe with preserved fish that sustained populations through winters and fed the poor through religious fasting periods when meat was prohibited.

The Cod Economy

For 400 years, cod was so economically important that it was referred to as “poor man’s gold.” Entire Atlantic economies — Portugal, Spain, England, France, Iceland, Norway, Newfoundland — were built around cod fishing and trade.

• Portugal’s national dish, bacalhau (salt cod), has over 1,000 traditional recipes — a testament to how central cod was to Portuguese culture and nutrition for centuries
• The city of Boston’s most important civic building — Faneuil Hall — was built partly on cod fishing wealth
• The carved wooden codfish hanging in the Massachusetts State House — the “Sacred Cod” — has been there since 1784, representing the fish’s importance to the state’s economy

The Cod Wars

Between the 1950s and 1976, Iceland and the United Kingdom fought three “Cod Wars” — diplomatic and occasionally physical confrontations over North Atlantic fishing rights. Iceland progressively extended its exclusive fishing zone from 4 to 200 nautical miles — protecting collapsing cod stocks from overfishing. The resolution of the Cod Wars established the modern 200-nautical-mile Exclusive Economic Zone principle that shapes international maritime law today.

Health Benefits of Cod

Exceptional Lean Protein for Every Goal

Cod’s clean protein profile — 23g per 100g, 0.8g fat, 0g carbohydrates, 105 calories — makes it one of the most versatile protein sources for virtually every dietary goal:

Muscle building — complete protein with all 9 essential amino acids including leucine to trigger muscle protein synthesis.

Fat loss — the highest protein-to-calorie ratio among widely available whole food protein sources.

Maintenance — clean, micronutrient-rich protein that fits any calorie target without excessive fat or carbohydrate contribution.

Body recomposition — the combination of high protein, very low fat, and micronutrient density supports simultaneous muscle retention and fat loss.

Heart Health Through Multiple Pathways

B12 and B6 for homocysteine reduction — the combination of 50% DV B12 and 23% DV B6 per 100g of cod provides two of the three B vitamins (alongside folate) that regulate homocysteine. Elevated homocysteine is a well-established independent cardiovascular risk factor — adequate B12 and B6 from dietary sources like cod directly reduces this risk.

Selenium for cardiovascular antioxidant protection — selenium-dependent glutathione peroxidases protect LDL cholesterol from oxidative damage. Oxidised LDL is far more atherogenic than native LDL — selenium from cod reduces this oxidation risk.

Omega-3 contribution — while modest at 0.15g EPA+DHA per 100g (compared to 2–3g in salmon or mackerel), cod’s omega-3 contribution adds to total dietary EPA+DHA intake. Regular consumption of any EPA+DHA-containing fish — including lean white fish like cod — is associated with cardiovascular benefits in large population studies.

Very low sodium — at just 54mg per 100g, cod is one of the lowest-sodium protein foods available. For people managing blood pressure or cardiovascular conditions where sodium reduction is recommended, cod is an excellent protein choice.

Potassium — 330mg per 100g counteracts any sodium in the overall diet and supports healthy blood pressure through the sodium-potassium pump.

Neurological Health

The B12-B6 combination in cod supports neurological health through complementary mechanisms:

B12 — myelin synthesis, red blood cell formation, homocysteine metabolism, DNA synthesis. At 50% DV per 100g, regular cod consumption makes a meaningful contribution to maintaining B12 status — particularly important for older adults whose absorption efficiency declines.

B6 — neurotransmitter synthesis (serotonin from tryptophan, dopamine and noradrenaline from tyrosine, GABA from glutamate), protein metabolism, and alongside B12 in homocysteine conversion. The 23% DV per 100g is a significant B6 contribution from a lean protein source.

Taurine — like clams, cod contains taurine — an amino acid with documented neuroprotective properties, inhibitory neurotransmitter activity, and sleep-supporting effects.

Thyroid and Metabolic Health

The combination of selenium (60% DV) and iodine — naturally present in all marine fish — makes cod particularly valuable for thyroid health.

Selenium activates thyroid hormone T4 to active T3 through deiodinase enzymes. Selenium deficiency impairs this activation regardless of iodine availability.

Iodine is required for the synthesis of thyroid hormones T3 and T4 themselves. Marine fish are among the most reliable dietary iodine sources available — with cod providing approximately 99µg of iodine per 100g (66% of the recommended intake). This combination of iodine for hormone synthesis and selenium for hormone activation makes cod one of the most complete thyroid-supporting dietary foods available.

Adequate thyroid function is directly linked to metabolic rate, energy levels, body weight regulation, mood, and cognitive function — making thyroid health relevant to virtually every health and performance goal.

Weight Management

Cod’s exceptional protein-to-calorie ratio makes it one of the most effective foods for fat loss and weight management:

High satiety per calorie — protein is the most satiating macronutrient, producing the greatest reduction in appetite per calorie consumed. At 23g of protein per 105 calories, cod produces more satiety per calorie than virtually any other whole food.

Thermic effect — approximately 20–30% of protein calories are burned during digestion — meaning the net caloric contribution of cod’s protein is lower than the label suggests.

Zero carbohydrates — no blood sugar impact, no insulin spike, no energy crash.

Muscle preservation during deficit — adequate protein from lean sources like cod maintains muscle protein synthesis during calorie restriction, preserving lean mass while fat is lost. A meal of 180g of cod provides 41.4g of protein at 189 calories — far exceeding the post-workout protein threshold for muscle protein synthesis at minimal caloric cost.

Bone Health

Cod’s phosphorus (29% DV per 100g, 52% per fillet) and Vitamin D (11% DV per 100g, 20% per fillet) work together as a meaningful bone health contribution:

Phosphorus is the second most abundant mineral in bone — working with calcium as the structural foundation of hydroxyapatite.

Vitamin D enhances calcium and phosphorus absorption from the digestive tract — without adequate Vitamin D, dietary calcium cannot be efficiently absorbed regardless of intake level. Cod’s modest but meaningful Vitamin D content from a lean protein source is distinctive among non-fatty fish.

Cod for Athletes and Active People

The Ultimate Cutting Phase Protein

During fat loss phases where maintaining high protein intake while managing total calories is the primary nutritional challenge, cod is arguably the single best whole food protein available:

A 200g cod fillet provides 46g of protein at 210 calories — covering approximately 25–30% of a typical athlete’s daily protein requirement at just 10% of a 2,000 calorie daily budget.

Selenium for Exercise Recovery

At 60% DV per 100g (108% per fillet), cod provides one of the highest selenium concentrations available from a lean protein source. Athletes generating high levels of exercise-induced oxidative stress — from intense training, long endurance sessions, or high training volumes — particularly benefit from the selenium-dependent antioxidant defenses that regular cod consumption supports.

B6 for Protein Metabolism

At 23% DV of B6 per 100g, cod provides substantial B6 alongside its protein. This is nutritionally fitting since B6 is required for every gram of protein metabolism — higher protein intakes increase B6 requirements, and cod provides both the protein and a significant portion of the B6 needed to metabolize it.

Thyroid Support for Metabolic Rate

For athletes during calorie restriction — where the thyroid-driven metabolic rate can downregulate as an adaptation to the deficit — regular cod consumption supports the iodine and selenium availability needed for optimal thyroid hormone synthesis and activation. Maintaining thyroid function during a cut helps prevent the metabolic rate suppression that makes fat loss progressively harder.

Very Low Sodium for Lean Physique Goals

At 54mg of sodium per 100g, cod is one of the most sodium-minimal protein sources available — important for athletes managing water retention around competition or photo shoots where sodium-induced water retention affects visual appearance.

White Cod vs. Fatty Fish: When to Choose Which

Cod and fatty fish (salmon, mackerel, sardines, herring) serve complementary rather than competitive nutritional roles — choosing between them should reflect the specific nutritional goal:

The ideal approach is to include both white fish (cod, haddock, plaice, sole) and fatty fish (salmon, mackerel, sardines) in a weekly meal plan — leveraging cod’s protein efficiency and selenium density alongside fatty fish’s EPA+DHA omega-3 content.

Different Cod Species and Related White Fish

Atlantic cod (Gadus morhua) — the traditional North Atlantic species that shaped history. The nutritional data on this page reflects Atlantic cod.

Pacific cod (Gadus macrocephalus) — closely related to Atlantic cod with essentially identical nutritional profile. Slightly milder flavour.

Black cod (Sablefish) — not a true cod. Sablefish is a fatty fish with significantly higher omega-3 content than true cod — nutritionally more similar to salmon than to lean white cod.

Related white fish with similar nutritional profiles:

• Haddock — virtually identical to cod nutritionally. Slightly sweeter flavor, slightly smaller size
• Pollock — Alaska pollock is the most widely caught fish species globally — the basis of most fish fingers, fish sandwiches, and imitation crab. Nutritionally comparable to cod with slightly lower selenium
• Hake — nutritionally similar to cod, popular in Spain and Portugal
• Plaice and sole — flatfish with comparable leanness to cod, slightly different texture

For nutritional purposes, all of these white fish are interchangeable — choosing between them is a culinary and availability decision rather than a nutritional one.

Sustainability of Cod

The sustainability picture for cod is more complex than for clams or small pelagic fish like anchovies — and worth addressing honestly.

The Overfishing History

Atlantic cod was arguably the most overfished species in history. The Grand Banks of Newfoundland — once so abundant with cod that early explorers reported being able to lower baskets into the sea and pull them out full of fish — collapsed catastrophically in 1992 after decades of industrial overfishing. The Canadian government declared a complete moratorium on cod fishing that year, devastating Newfoundland’s economy and putting 40,000 people out of work. The cod stocks have recovered only partially in the three decades since.

The Current Situation

Cod sustainability varies significantly by fishing ground:

North-East Arctic cod (Barents Sea) — currently the largest and most sustainably managed Atlantic cod stock. Certified sustainable by the Marine Stewardship Council (MSC). The recommended choice for environmentally conscious cod consumers.

Icelandic cod — well-managed and MSC certified from most fishing areas. A good choice.

North Sea cod — stocks have partially recovered from historic overfishing but remain below target levels. Exercise caution.

Grand Banks/Newfoundland cod — still recovering from the 1992 collapse. Avoid.

Pacific cod (Alaska) — sustainably managed under strict US and international fisheries regulations. An excellent choice.

Practical guidance: Look for MSC certified cod, cod labelled as from the Barents Sea or Iceland, or Alaskan pollock as a nutritionally equivalent sustainable alternative. Checking the MSC website or using a sustainable seafood guide app confirms current status.

Preparing Cod: Cooking Methods and Flavor

Cod’s lean, mild, flaky flesh is remarkably versatile — adapting to virtually any cooking method and cuisine style:

Pan-frying — sear skin-side down in a hot pan with olive oil until the flesh flakes easily. Simple, quick, delicious. The mild flavor accepts virtually any seasoning direction.

Baking — one of the most practical methods for a weeknight meal. Season, bake at 200°C for 12–15 minutes per 2.5cm of thickness until flesh flakes and reaches 63°C internally.

Poaching — gently simmer in stock, court bouillon, or seasoned water. Produces exceptionally moist, tender flesh. The poaching liquid becomes a flavorful broth.

Steaming — retains the most moisture and nutrients. Classic in Asian preparations — steamed cod with ginger, soy, and sesame oil is nutritionally outstanding.

Fish and chips — the British national dish. The batter and deep-frying dramatically increase calories and reduce the protein-to-calorie advantage of cod — but the nutritional value of the cod itself remains intact beneath the batter.

Salt cod (bacalhau) — the historical preservation method. Salt cod must be soaked in water for 24–48 hours before cooking to remove the salt. Traditional throughout Portugal, Spain, the Caribbean, and Brazil. Nutritionally comparable to fresh cod after soaking, though sodium content remains higher.

Ceviche — raw cod “cooked” in citrus juice acid. Popular in Latin American cuisine. The citric acid denatures the proteins without heat. Produces a uniquely fresh, light preparation. Use only sushi-grade fresh cod from verified clean sources for raw preparations.

Practical Ways to Include Cod in Your Diet

Classic baked cod with olive oil and herbs — the simplest high-protein, low-calorie dinner. Season a cod fillet with olive oil, lemon, garlic, fresh herbs (dill, parsley, thyme) and bake for 15 minutes. Serve with sweet potato and steamed vegetables for a complete, nutritionally outstanding meal.

Cod tacos — flaked baked or grilled cod in corn tortillas with cabbage slaw, avocado, lime, and fresh salsa. The avocado provides fat for fat-soluble vitamin absorption; the lime provides Vitamin C; the cabbage provides fiber — a nutritionally complete meal in taco form.

Cod with tomatoes and olives — a Mediterranean-style baked preparation. The tomatoes provide Vitamin C and lycopene; the olive oil provides heart-healthy monounsaturated fat. Simple, nutritious, complete.

Cod in a curry — cod’s firm flesh holds up well in curry sauces. A coconut milk-based curry provides the fat needed for fat-soluble vitamin absorption alongside the extraordinary protein density of the cod.

Post-workout meal — 200g of baked cod with 150g of sweet potato (beta-carotene, potassium, complex carbohydrates) is one of the most nutritionally complete, muscle-building post-workout meals available at under 350 calories.

Fish finger alternative — homemade cod “fingers” baked rather than fried — coat cod strips in egg and breadcrumbs, bake at 200°C for 15 minutes. The nutritional profile of cod with the appeal of a familiar format.

Cod vs. Other White Fish and Lean Proteins

Cod stands out as one of the lowest-calorie high-protein options with excellent selenium and B12 content — nutritionally comparable to haddock and pollock (which slightly exceed cod in B12) while maintaining a cleaner sodium profile than many alternatives.

Potential Considerations

Mercury content — cod contains mercury at levels significantly lower than large predatory fish like tuna, swordfish, and king mackerel. The FDA considers cod a “best choice” fish for regular consumption, including for pregnant women and children. It can safely be eaten 2–3 servings per week without mercury concerns for most people.

Sodium in salt cod and canned cod — while fresh cod has very low sodium (54mg per 100g), salt cod and many canned cod products have very high sodium from preservation. Soak salt cod thoroughly before cooking; rinse canned cod; read labels on processed cod products.

Sustainability — as discussed above, choosing MSC certified, Icelandic, Barents Sea, or Alaskan cod/pollock ensures responsible sourcing from well-managed fisheries.

Cod liver oil caution — Vitamin A in cod liver oil can accumulate to toxic levels at very high doses. This is specifically a concern for cod liver oil supplements, not cod flesh which contains negligible Vitamin A. Pregnant women in particular should follow guidance on maximum Vitamin A intake from all sources including supplements.

Allergies — fish allergy is distinct from shellfish allergy and can cause severe reactions. People with known fish allergy must avoid cod regardless of preparation method.