Tuna is a high-purine fish, which means it can raise uric acid levels and potentially trigger gout flares. Fresh tuna contains about 157 mg of purines per 100 grams, placing it firmly in the high-purine category alongside sardines, anchovies, and mackerel. That said, tuna isn’t completely off-limits. Small portions eaten occasionally are generally considered safe, and tuna’s omega-3 fatty acids may actually help reduce gout flare frequency.
Why Purines in Tuna Matter for Gout
Gout happens when uric acid builds up in your blood and forms sharp crystals in your joints. Your body produces uric acid when it breaks down purines, compounds found naturally in many foods. The more purines you eat, the more uric acid your body has to process and eliminate.
Seafood as a category is classified as purine-rich, with raw and processed fish ranging from 110 to 260 mg of purines per 100 grams depending on the species. Tuna lands in the upper portion of that range. Fresh tuna clocks in at roughly 157 mg per 100 grams, while canned tuna is somewhat lower at about 117 mg per 100 grams. For context, foods with more than 150 mg of purines per 100 grams are generally considered high-purine, meaning fresh tuna just crosses that threshold.
The Omega-3 Factor
Here’s where tuna gets more complicated than a simple “avoid it” answer. Tuna is rich in omega-3 fatty acids (EPA and DHA), which act as natural anti-inflammatory compounds. They work by competing with another fatty acid in your body that produces more inflammatory signals. When omega-3s win that competition, the resulting inflammation is milder.
A pilot clinical trial in people with gout found a striking relationship: participants with higher omega-3 levels in their red blood cells experienced significantly fewer gout flares. The correlation was strong, with higher concentrations of both EPA and DHA independently linked to fewer total flares. The researchers concluded that omega-3 supplementation didn’t worsen uric acid levels or BMI, and that its relationship with fewer flares warranted larger studies. This suggests the omega-3s in tuna could partially offset its purine content, at least in terms of flare risk.
Not All Tuna Is Equal
The type of tuna you choose makes a real difference. Skipjack tuna and canned tuna tend to have lower purine levels, making them better options if you have gout. Albacore and yellowfin tuna carry higher purine content and are worth limiting or avoiding during active flares.
Canned tuna deserves special mention because the canning process appears to reduce purine content by about 25% compared to fresh. At roughly 117 mg per 100 grams, canned tuna falls into the moderate-purine range rather than the high-purine range. If you’re going to eat tuna with gout, canned skipjack packed in water is your safest bet.
How Much Tuna Is Safe
The Mayo Clinic, referencing the 2020 American College of Rheumatology guidelines for gout management, notes that even people with gout can include small amounts of fish in their diets. The key word is “small.” A practical approach is to keep portions modest (around 3 to 4 ounces per serving) and limit fish to a couple of times per week rather than making it a daily staple.
Timing matters too. During an active gout flare, it’s wise to avoid tuna and other high-purine seafood entirely. Between flares, when your uric acid is better controlled, occasional small servings are less likely to cause problems. If you’re on medication that lowers uric acid, you have more flexibility, but portion control still applies.
Tuna Compared to Other Seafood
Tuna isn’t the worst offender in the seafood world. Anchovies, sardines, herring, and shellfish all rank among the highest-purine options. Tuna falls into a middle-to-high tier alongside salmon, trout, and mackerel. If you love seafood and have gout, you don’t need to eliminate all of it. You do need to be selective.
- Higher risk: anchovies, sardines, herring, shellfish, organ meats
- Moderate risk: tuna (especially canned), salmon, trout, mackerel
- Lower risk: most white fish like cod (in small amounts), as well as plant-based protein sources
Practical Tips for Eating Tuna With Gout
Choose canned skipjack tuna over fresh albacore or yellowfin. The canning process lowers purine content, and skipjack starts with less to begin with. Stick to 3 to 4 ounce servings, and don’t eat tuna more than once or twice a week. Pair it with low-purine sides like vegetables, whole grains, or salads rather than stacking it with other high-purine proteins.
Stay well hydrated on days you eat tuna or other purine-rich foods. Water helps your kidneys flush uric acid more efficiently. And if you notice that tuna consistently precedes flares for you personally, your body is giving you a clear signal. Gout triggers vary from person to person, and your own pattern matters more than any general guideline.