Cod is one of the healthiest lean proteins you can eat. A 3-ounce cooked serving has just 90 calories and 1 gram of fat while delivering a substantial amount of complete protein, iodine, and several B vitamins. It’s low in mercury, versatile in the kitchen, and filling enough to support weight management.
Calories, Protein, and Key Nutrients
Cod is remarkably lean. That 3-ounce serving contains 90 calories, zero grams of saturated fat, and roughly 20 grams of protein. For context, the same portion of Atlantic salmon runs about 200 calories and 10 grams of total fat. If you’re looking for a high-protein food that won’t load you up on calories, cod is hard to beat.
Beyond protein, cod is a standout source of iodine, a mineral many people don’t think about. A single 3-ounce baked serving provides 146 micrograms, which covers 97% of the daily value for adults. Your thyroid gland needs iodine to produce hormones that regulate metabolism, energy, and body temperature. Many people get their iodine from iodized salt, but if you’ve cut back on salt, eating cod a couple of times a week can help fill the gap.
Cod also supplies choline (71 mg per 3 ounces, about 13% of the daily value), a nutrient important for liver function and brain health that most Americans don’t get enough of. It contains vitamin B12 as well, which supports nerve function and red blood cell production.
Omega-3s: Present but Modest
Cod does contain omega-3 fatty acids, but not in the amounts you’d get from fattier fish. A 3-ounce serving provides about 19 mg of EPA and 38 mg of DHA. Compare that to salmon, which delivers roughly 10 to 20 times more per serving. If your primary goal is boosting omega-3 intake for heart or brain health, salmon, mackerel, or sardines are better choices. But cod still contributes some, and eating it regularly as part of a varied diet adds up.
Benefits for Heart Health
Even without high omega-3 levels, cod appears to support cardiovascular health. In a clinical trial involving people with coronary heart disease, those who ate lean fish like cod saw their systolic blood pressure drop by about 3.5% and diastolic blood pressure by about 4.6% over eight weeks. That’s a meaningful reduction, particularly for people already managing heart disease with medication. The mechanism likely involves cod’s combination of high-quality protein, low saturated fat, and mineral content rather than omega-3s alone.
Why Cod Keeps You Full
One of cod’s underappreciated strengths is how satisfying it is relative to its calorie count. Research has consistently shown that white fish produces greater feelings of fullness than equal portions of lean meat or chicken. One study found that people who ate fish protein consumed less food at their next meal compared to those who ate the same amount of beef protein, even though both meals had identical calorie counts. This makes cod a practical choice if you’re trying to eat less without feeling hungry between meals.
The high protein content is part of the explanation. Protein is the most satiating macronutrient, and cod delivers a large amount of it per calorie. But the effect seems to go beyond what protein alone would predict, suggesting something about the amino acid profile of fish protein triggers stronger fullness signals.
Mercury and Safety
Cod is a low-mercury fish. According to FDA testing data covering over a hundred samples, the mean mercury concentration in cod is 0.111 parts per million, with a median of just 0.066 ppm. For comparison, high-mercury fish like swordfish and shark typically measure above 0.9 ppm. Cod falls comfortably in the low-mercury category, making it safe to eat two to three times per week for adults, pregnant women, and children.
How Cod Compares to Salmon
The choice between cod and salmon isn’t really about which is “better.” They fill different nutritional roles. Cod gives you more protein per calorie with almost no fat, making it ideal when you want a lean, light meal. Salmon gives you far more omega-3 fatty acids and fat-soluble vitamins like vitamin A (4% of the daily value versus 0% for cod), but at more than double the calories.
The smartest approach is eating both. Cod works well for weeknight dinners when you want something quick, light, and filling. Salmon covers your omega-3 needs. Rotating between the two, along with other seafood, gives you the broadest range of nutrients.
Simple Ways to Prepare Cod
Cod has a mild, slightly sweet flavor and a flaky texture that takes well to almost any cooking method. Baking at 400°F for 12 to 15 minutes with olive oil, lemon, and garlic is the easiest route. It also holds up well when pan-seared, poached in broth, or added to soups and stews. Because it’s so lean, overcooking dries it out quickly. Pull it from the heat as soon as the flesh turns opaque and flakes easily with a fork.
Both Atlantic and Pacific cod are widely available fresh and frozen. Frozen cod is typically flash-frozen at sea, which preserves quality well. There’s no significant nutritional difference between the two species for practical purposes.