Canned tuna does provide omega-3 fatty acids, but it’s far from the richest source. A 3-ounce serving of water-packed canned tuna delivers between 260 and 340 milligrams of EPA and DHA, the two omega-3s linked to heart and brain health. That’s a meaningful amount, but other canned fish like sardines deliver several times more per serving.
How Much Omega-3 You Actually Get
The omega-3 content in canned tuna varies quite a bit depending on the type you buy and how it’s packed. Water-packed canned tuna provides 0.26 to 0.34 grams of combined EPA and DHA per 3-ounce serving. Oil-packed tuna that’s been drained drops to just 0.09 to 0.26 grams per serving.
That gap exists because omega-3 fatty acids migrate out of the fish and into the surrounding oil during storage. When you drain the can, you pour a significant portion of those fats down the sink. Albacore tuna canned in oil loses roughly three-quarters of its omega-3s compared to water-packed, according to analysis from Tufts University. If you do buy oil-packed tuna, using the oil in your meal (in a salad dressing or pasta, for example) recaptures some of those lost omega-3s.
The canning process itself doesn’t destroy omega-3s. The heat and pressure of commercial canning leave these fatty acids intact, so the convenience factor doesn’t come at a nutritional cost on its own.
Canned Tuna vs. Other Fish
Compared to other affordable canned fish, tuna sits near the bottom for omega-3 content. Canned light tuna (the most common variety) provides about 109 milligrams of EPA and DHA per 3-ounce serving when packed in oil and drained. Canned sardines deliver 842 milligrams in the same portion, roughly seven times more.
Canned salmon is another strong option, typically providing 1,000 milligrams or more per serving. If your primary goal is omega-3 intake, sardines or salmon are significantly more efficient choices. But if you prefer tuna, eating it two to three times per week still contributes a reasonable amount toward your overall intake, especially when you choose water-packed varieties.
Light Tuna vs. White (Albacore) Tuna
The two main types of canned tuna sit in different categories for both nutrition and safety. Albacore (labeled “white tuna”) is a fattier fish and generally contains more omega-3s per serving. Light tuna, usually made from skipjack, is leaner and lower in omega-3s.
Mercury is the tradeoff. Canned light tuna averages 0.126 parts per million of mercury, while canned albacore averages 0.350 ppm, nearly three times higher. The FDA classifies canned light tuna as a “Best Choice,” meaning it’s safe to eat two to three servings per week. Albacore falls into the “Good Choices” category, with a recommended limit of one serving per week. For pregnant or breastfeeding women, one serving is 4 ounces.
For children, the FDA recommends two servings per week from the “Best Choices” list, with portion sizes scaled by age: about 1 ounce for toddlers, 2 ounces for ages 4 to 7, and working up to 4 ounces by age 11.
How Much Omega-3 You Need
There’s no official recommended daily intake specifically for EPA and DHA. The National Institutes of Health has set adequate intakes only for ALA, a plant-based omega-3 found in foods like flaxseed and walnuts: 1.6 grams per day for adult men and 1.1 grams for adult women. ALA is a different fatty acid from the EPA and DHA in fish, and your body converts only a small fraction of ALA into those forms.
Most major health organizations suggest eating fatty fish at least twice per week to get enough EPA and DHA. If you’re relying on canned tuna alone for that, choosing water-packed varieties and eating it regularly will contribute, but pairing it with higher-omega-3 fish like sardines or salmon on other days gives you a much stronger overall intake.
Getting the Most Omega-3 From Canned Tuna
A few simple choices make a noticeable difference in how much omega-3 you actually absorb from each can:
- Choose water-packed over oil-packed. You retain significantly more omega-3s after draining.
- If you buy oil-packed, use the oil. Mix it into dressings, sauces, or the dish itself rather than discarding it.
- Pick albacore for more omega-3s per serving, but limit yourself to one serving per week due to higher mercury levels.
- Rotate with other canned fish. Swapping in sardines or salmon a couple of times per week dramatically increases your EPA and DHA intake without adding much effort or cost.
Canned tuna is a convenient, affordable source of omega-3s, but calling it a “good” source depends on your frame of reference. It’s better than chicken or beef, which contain almost none. It’s substantially less potent than sardines, salmon, or mackerel. If you enjoy tuna and eat it regularly in water-packed form, it makes a real contribution to your omega-3 intake. If you’re trying to maximize EPA and DHA specifically, other canned fish get you there faster.