Contents
What it is
Mackerel is a blue-backed fish marked with wavy stripes, swimming fast in schools. It is among the most heavily landed fish in Korean coastal waters, and it is fattest from autumn into winter. The flesh carries a lot of fat and streaks of dark muscle, which gives it a strong flavour. It is also high in histidine, and left at room temperature that converts to histamine fast enough to cause allergy-like reactions — so freshness matters more here than with most fish. That is part of why salted mackerel is so common.
Scientific name Scomber japonicus
Omega-3 makes people think of salmon, but mackerel actually contains more EPA and DHA — 2.6 g per 100 g against salmon's 2.2 g.
Mackerel also sits low in the food chain, so it accumulates little mercury. Unlike large species such as tuna or swordfish, it belongs to the low-mercury fish recommended even during pregnancy.
Key benefits
- Strong evidence
EPA and DHA lower triglycerides
Omega-3 fats clearly reduce blood triglycerides. A large body of observational work links eating oily fish twice a week or more with lower cardiovascular risk.[1]
- Nutrition data
It covers vitamin D from food
16 µg (640 IU) per 100 g — more than salmon. Very few foods carry meaningful vitamin D, which makes mackerel valuable if you are indoors most of the day or face dark winters.
- Nutrition data
Low in mercury, so it is recommended in pregnancy
Atlantic and Pacific mackerel are low-mercury species (king mackerel is a separate, high-mercury fish to avoid). Because DHA is linked to fetal visual and cognitive development, eating it during pregnancy is actively encouraged.
- Nutrition data
Rich in vitamin B12 and selenium
100 g provides more than three times the daily B12 requirement. Selenium forms part of antioxidant enzymes and is also known to offset some of mercury's toxicity.
How to eat it well
- Omega-3 is vulnerable to heat and oxygen. Medium-heat grilling or braising beats a long, hard sear.
- The fat concentrates near the skin. Crisp it and eat it.
- Discarding the fat that renders out throws away omega-3 with it. Braising or steaming loses less.
- Canned mackerel works well — the softened bones add calcium and omega-3 remains in the liquid.
- Mackerel forms histamine fast, so freshness matters. Prepare and refrigerate it promptly after buying.
How to read the grades
Each benefit carries a label showing how far research on people supports it. Grades differ between items even within the same ingredient.
- Nutrition data
- A fact verifiable from food composition databases or health authorities. This is a different kind of statement from a clinical effect.
- Strong evidence
- Consistently confirmed across randomised controlled trials or meta-analyses.
- Moderate evidence
- Human studies exist, but effect sizes are small or results are mixed.
- Early research
- Cell or animal work, or small preliminary studies.
- Not established
- Commonly claimed, but not confirmed in studies on people.
What to watch out for
- Mackerel is the classic cause of scombroid (histamine) poisoning. Left at room temperature it develops histamine that cooking will not destroy.
- King mackerel is a different fish, high in mercury, and should be avoided in pregnancy.
- With gout, account for the purine content.
- Salted mackerel is very high in sodium.
- On anticoagulants, discuss combining it with high-dose omega-3 supplements (the fish itself is usually fine).
Nutrition
Per 100 g of raw Atlantic mackerel. A fillet is roughly 100 g. Grilling drives off water and fat, so what reaches the plate weighs less than this. Salted mackerel carries added sodium on top of these figures.
- Calories
- 205 kcal10%
- Protein
- 18.6 g37%
- Fat
- 13.9 g18%
- Omega-3
- 2.6 g
- Vitamin D
- 16 µg80%
- Vitamin B12
- 8.7 µg363%
- Selenium
- 44 µg80%
- Potassium
- 314 mg7%
Percentages are of the US FDA Daily Value for adults and children 4 and over. National reference intakes differ by sex and age.
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Key nutrients
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Sources
The databases and health authorities this article's nutrition figures and health statements draw on.
- 1Omega-3 fatty acids for the primary and secondary prevention of cardiovascular diseaseMeta-analysisAbdelhamid AS, et al. Cochrane Database Syst Rev 2020PMID 32114706
- 2USDA FoodData CentralFood composition database
- 3NIH Office of Dietary SupplementsHealth authority
- 4World Health Organization · Healthy dietHealth authority
- 5PubMedResearch literature
