Mackerel is one of the higher-purine fish you can eat, and for people with gout, that makes it a significant trigger. A 3.5-ounce serving of raw mackerel contains about 194 mg of purines, while the same amount of canned mackerel jumps to around 246 mg. Both place mackerel firmly in the “high purine” category (150 mg or more per 100 grams), alongside organ meats, sardines, anchovies, and herring.
But the full picture is more nuanced than “avoid all fish forever.” Mackerel is also one of the richest sources of omega-3 fatty acids, which have real anti-inflammatory effects on gout. Here’s what that tradeoff actually looks like.
Why Purines in Mackerel Raise Uric Acid
Your body breaks purines down into uric acid. When uric acid builds up in the blood faster than the kidneys can clear it, sharp crystals form in joints, causing the intense pain of a gout flare. Foods with high purine concentrations accelerate that process. The 2020 American College of Rheumatology guideline for gout management conditionally recommends limiting purine intake regardless of whether you’re currently in a flare or between attacks.
Mackerel lands in the same high-purine tier as liver, kidney, brain, and other organ meats. That doesn’t mean a single bite will trigger an attack, but regular servings can meaningfully raise your baseline uric acid levels over time, narrowing the margin before your next flare.
Canned vs. Fresh: Preparation Matters
How mackerel is processed changes its purine load. Raw mackerel contains roughly 194 mg of purines per 3.5-ounce serving. Canned mackerel concentrates those purines to about 246 mg in the same portion, a roughly 27% increase. The canning process removes water while preserving the purine-rich flesh, effectively packing more purines into every bite.
If you do eat mackerel occasionally, choosing fresh over canned gives you a somewhat lower purine dose. Boiling fish and discarding the cooking water can also reduce purine content, since some purines dissolve out during cooking.
The Omega-3 Counterargument
Here’s where mackerel gets complicated. It’s loaded with omega-3 fatty acids (EPA and DHA), which work as natural anti-inflammatory compounds. They compete with pro-inflammatory molecules in your body for the same processing pathways, and when omega-3s win that competition, the result is less inflammation overall.
A pilot trial in people with gout found a striking pattern: participants whose red blood cell omega-3 levels rose above a certain threshold had zero gout flares over a 12-week observation period. The correlation between higher omega-3 concentrations and fewer flares was strong, with correlation coefficients around -0.75 for both EPA and DHA. In rheumatoid arthritis research, roughly 3 grams of omega-3s daily has been enough to reduce the need for anti-inflammatory painkillers.
A large cross-sectional study from the EPIC-Oxford cohort added another layer of nuance. People who ate fish but no meat actually had the lowest uric acid levels of any dietary group, lower than vegans and lower than meat eaters. The correlation between daily fish intake and uric acid was weak and not statistically significant. This suggests that moderate fish consumption within an otherwise healthy diet doesn’t necessarily raise uric acid to dangerous levels.
How Mackerel Compares to Other Triggers
Not all high-purine foods carry identical risk. Mackerel sits in the upper range for fish but doesn’t reach the extremes of some organ meats, which can contain over 800 mg of purines per 100 grams. Here’s how common gout triggers stack up:
- Organ meats (liver, kidney, sweetbreads): 150 to 825+ mg per 100g, the highest-risk category
- Anchovies and sardines: high purine, in the same tier as mackerel
- Herring: high purine, comparable to mackerel
- Shellfish: moderate to high purine depending on type
- Mackerel (raw): approximately 194 mg per 100g
- Mackerel (canned): approximately 246 mg per 100g
Alcohol (especially beer), sugary drinks with high-fructose corn syrup, and red meat are also major contributors to uric acid production. For many people, cutting back on those has a bigger overall impact than eliminating one type of fish.
Practical Approach for Gout Patients
The Mayo Clinic notes that even people with gout can include small amounts of fish in their diets, because the nutritional benefits of seafood are real. The key is portion control and frequency. A small serving of fresh mackerel once a week is a very different proposition than eating canned mackerel several times a week.
If you want the omega-3 benefits without the purine load, you have a few options. Lower-purine fish like salmon generally deliver solid omega-3 levels with less gout risk. Fish oil supplements provide concentrated EPA and DHA with essentially no purines at all, which is exactly what the pilot trial used to achieve those flare-reduction results. Plant-based omega-3 sources like walnuts and flaxseed offer a different form of omega-3 (ALA) that your body converts less efficiently, but they carry zero purine risk.
If you’re currently having frequent flares or just starting uric acid-lowering medication, avoiding high-purine fish like mackerel entirely during that period is the safer choice. Once your uric acid is well-controlled, occasional small servings become more reasonable, especially if the rest of your diet is low in purines and you’re staying hydrated.