Mackerel — 205 kcal

Mackerel is one of the most nutrient-dense fish in the sea — an oily, torpedo-shaped predator whose intense flavor and remarkable vitamin content have made it a dietary staple from Japan's saba-zushi to Norway's smoked mackerel fillets. At 205 kcal per 100 g with 18.6 g of protein and 13.9 g of fat, it delivers a generous payload of omega-3 fatty acids alongside a micronutrient profile that puts most multivitamins to shame. Mackerel is also one of the most sustainable and affordable fish you can buy.

What's Inside

Vitamin B12 is extraordinary at 8.71 mcg per 100 g — 363% of the Daily Value — making mackerel one of the single richest food sources of this nerve-protecting vitamin on the planet. Vitamin D (16.1 mcg, over 100% DV) is equally impressive, providing a full day's requirement in a single serving — critical given that over 40% of American adults are vitamin D deficient. Selenium (44.1 mcg, 80% DV) fuels the glutathione and thioredoxin antioxidant systems, and niacin (9.08 mg, 57% DV) drives NAD+-dependent energy metabolism. Magnesium (76 mg, 18% DV) is exceptionally high for a fish, supporting muscle relaxation, blood sugar regulation, and over 600 enzymatic reactions. Phosphorus (217 mg) and potassium (314 mg) maintain bone density and cardiovascular rhythm. Iron (1.63 mg) in heme form and zinc (0.63 mg) support oxygen transport and immune defense. Vitamin B6 (0.4 mg) aids hemoglobin synthesis, and riboflavin (0.31 mg) powers flavin-dependent mitochondrial energy production. Thiamin (0.18 mg) assists carbohydrate metabolism. Cholesterol sits at 70 mg.

Getting It Right

Mackerel's high oil content makes it ideal for high-heat cooking methods that render the fat and crisp the skin. For whole mackerel, slash the skin diagonally three times on each side, season with salt, and grill or broil for 4-5 minutes per side until the skin blisters and chars slightly. The fish is done when the flesh near the bone flakes easily. For fillets, pan-sear skin-side down over high heat for 3-4 minutes, flip briefly for 1 minute, and serve immediately. Mackerel deteriorates faster than most fish — its high fat content oxidizes quickly — so buy it as fresh as possible and cook within a day. Smoked mackerel is a superb make-ahead protein: flake it over salads, mix into pate with cream cheese and horseradish, or fold into pasta with lemon and capers. Canned mackerel in olive oil is an underrated pantry staple that retains nearly all of the fresh fish's nutritional value. Pair mackerel with sharp, acidic flavors — lemon, vinegar, pickled ginger, or mustard — to balance its rich oiliness.