Canned tuna is a moderate-purine food, containing roughly 157 mg of purines per 100-gram serving. That places it below the high-purine threshold of 200 mg but well above the low-purine cutoff of 100 mg. For most people with gout, this means canned tuna isn’t off-limits, but it does require some portion awareness.
Where Tuna Falls on the Purine Scale
Your body breaks down purines from food into uric acid. When uric acid builds up faster than your kidneys can clear it, crystals form in your joints, triggering gout flares. About 70% of uric acid is excreted through the kidneys and 30% through the intestines, so anything that increases production or slows excretion raises your risk.
At 157 mg of purines per 100 grams, tuna sits in the moderate range. For comparison, here’s how common seafood stacks up:
- Anchovies: 273 mg per 100 g (high)
- Mussels: 293 mg per 100 g (high)
- Shrimp: 192 mg per 100 g (moderate-high)
- Salmon: 177 mg per 100 g (moderate)
- Tuna: 157 mg per 100 g (moderate)
- Snow crab: 136 mg per 100 g (moderate)
- Codfish: 98 mg per 100 g (low)
- Scallops: 105 mg per 100 g (moderate)
Tuna actually has fewer purines than salmon, shrimp, and rainbow trout (180 mg). It’s far below the worst offenders like anchovies, sardines, and mussels. If you’ve been avoiding canned tuna entirely while eating salmon freely, the purine difference between the two doesn’t justify that choice.
Not All Purines Are Equal
Total purine count doesn’t tell the whole story. The specific types of purine bases in a food determine how much they raise uric acid. Hypoxanthine has the greatest dietary impact on gout risk, and adenine also raises urate levels significantly. Other purine bases have a milder effect. This is one reason why plant-based purine sources (like spinach and mushrooms) don’t seem to trigger gout flares the way animal-based sources do, even at similar total purine levels.
It’s also worth noting that sugar-sweetened drinks aren’t purine sources at all, yet they raise uric acid through a completely different pathway: fructose metabolism breaks down a cellular energy molecule, producing uric acid as a byproduct. If you’re carefully watching your tuna intake but drinking sweetened iced tea or soda with meals, the drinks may be a bigger contributor to your flares than the fish.
The Omega-3 Trade-Off
Here’s where the picture gets more nuanced. Tuna is rich in omega-3 fatty acids, which have strong anti-inflammatory properties. Research from Boston University found that consuming fish rich in omega-3s actually leads to a lower risk of recurrent gout flares. That’s a meaningful finding, because it suggests the anti-inflammatory benefits of certain fish can partially offset the purine load.
This doesn’t mean you can eat unlimited tuna and call it medicine. But it does mean that moderate fish consumption, including canned tuna, may be a net positive compared to replacing it with red meat or processed foods that carry their own gout risks.
How Much Canned Tuna Is Reasonable
The Mayo Clinic’s sample gout-friendly meal plan includes a 4-ounce serving of fish at dinner, which works out to about 113 grams. At tuna’s purine level, that’s roughly 175 mg of purines from a single serving. That’s a manageable amount for most people with gout, especially if the rest of your meals that day lean toward low-purine foods like eggs, low-fat dairy, vegetables, and whole grains.
A standard can of tuna is about 5 ounces (142 grams) after draining. Eating half a can at a time keeps you closer to a 4-ounce serving. Two to three servings per week is a reasonable target that balances the nutritional benefits with purine management. If you’re in the middle of an active flare, it’s smart to stick with lower-purine protein sources until the flare subsides.
Light vs. White Tuna
Canned “light” tuna is typically skipjack, a smaller species, while “white” tuna is albacore. Bluefin tuna is specifically listed among high-purine fish, so if you see bluefin steaks at a restaurant, that’s a different calculation than your standard canned variety. For everyday canned tuna, either light or white is a reasonable choice. Light tuna also tends to be lower in mercury, which is a separate but worthwhile consideration if you eat tuna regularly.
Practical Tips for Canned Tuna and Gout
Draining the liquid from canned tuna is a good habit regardless of whether it’s packed in water or oil. Some purines dissolve into the packing liquid during processing, so discarding that liquid rather than using it in recipes removes a portion of the purine content before it reaches your plate.
What you eat alongside the tuna matters too. Pairing it with low-fat dairy (like a tuna melt with reduced-fat cheese), vegetables, or whole grains helps keep your overall purine intake for that meal in check. The bigger dietary picture, including staying hydrated, limiting alcohol (especially beer), and cutting back on sugary drinks, typically has a larger effect on gout management than worrying about any single food.
If you’re on uric acid-lowering medication, your threshold for dietary purines is more forgiving. The medication handles the bulk of uric acid reduction, and moderate-purine foods like canned tuna fit comfortably into most treatment plans. If you’re managing gout through diet alone, being more deliberate about portion sizes and frequency makes sense.