Tuna
Tuna is a large marine fish consumed globally, rich in complete protein and omega-3 fatty acids. It is a significant dietary source of selenium, B vitamins, and iodine.
Also known as: skipjack tuna, yellowfin tuna, albacore tuna, bigeye tuna, bluefin tuna
Scientific & Editorial Standard: This information is synthesized from peer-reviewed databases (such as PubMed, NIH, NHS, and Mayo Clinic) and validated using multi-model cross-referencing by the Plateify Editorial Team. It is intended for educational purposes and is not medical advice. If you suspect food sensitivities, consult a healthcare provider.
Tuna comprises several species of large oceanic fish, including skipjack, yellowfin, bigeye, and albacore. It is harvested commercially and sold fresh, frozen, or canned. Tuna appears in sushi, salads, sandwiches, casseroles, and prepared seafood products across most cuisines.
Raw or cooked tuna provides approximately 23–28 g of protein per 100 g serving, with negligible carbohydrate content. Fatty tuna species (such as bluefin) contain higher levels of fat per 100 g, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)—long-chain omega-3 polyunsaturated fatty acids. Lean species such as skipjack contain approximately 1–2 g fat per 100 g. Tuna is a non-fibrous animal protein that digests readily.
Mercury and Heavy Metal Content
Tuna accumulates methylmercury from seawater and prey organisms; this concentration varies by species and size. Larger, longer-lived species (albacore, bigeye, bluefin) contain higher mercury levels than skipjack. The FDA advises pregnant individuals, nursing mothers, and young children to limit consumption of high-mercury fish and provides specific guidance on fish choices and serving frequencies at fda.gov. The NHS also provides guidance on limiting tuna consumption during pregnancy due to mercury content; consumers should follow current NHS recommendations at nhs.uk as these may be updated over time.
Portion and Risk Considerations
Most adults tolerate tuna without adverse effect. Individuals with fish allergy must avoid all tuna products. Canned tuna may contain added sodium and oils; checking product labels is advisable for those managing sodium intake. High histamine levels can develop in tuna that is handled or stored improperly after opening or purchase; individuals with histamine intolerance should consume only fresh, properly refrigerated tuna and exercise caution with any fish product that has been stored improperly after opening.
Frequently Asked Questions
How much mercury is in tuna?
Mercury content varies significantly by species. Bigeye tuna contains the highest levels, followed by albacore, while skipjack tends to have lower levels. The FDA advises pregnant women, nursing mothers, and children to limit consumption of high-mercury tuna species. All consumers should follow current FDA and NHS guidance on safe serving frequencies.
Is canned tuna safe to eat?
Canned tuna is safe for most people when consumed in moderation. Pregnant and nursing women should follow current FDA and NHS guidance on limiting high-mercury fish. Check sodium and oil content on labels if you are managing sodium intake or dietary fat.
Does tuna contain omega-3 fatty acids?
Yes. Fatty tuna species (particularly bluefin and albacore) provide meaningful amounts of EPA and DHA, long-chain omega-3 polyunsaturated fatty acids. Lean tuna such as light canned skipjack contains significantly less fat overall. The amount of omega-3s varies considerably by species and whether the tuna is packed in oil or water; albacore (white) canned tuna tends to be a richer source than light canned tuna.
Who should avoid eating tuna?
People with fish allergy must avoid tuna entirely. Individuals with histamine intolerance should consume only fresh, properly refrigerated tuna and exercise caution with any fish stored improperly after purchase or opening. Pregnant women, nursing mothers, and young children should limit intake of high-mercury tuna species (albacore, bigeye, bluefin) per current FDA and NHS guidance.
Sources
- Advice About Eating Fish — FDA
- Fish and shellfish nutrition — NHS
- Omega-3 Fatty Acids: Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- Fish and Seafood Nutrition — Harvard T.H. Chan School of Public Health
Educational content: This page is for general informational purposes only. Individual responses to foods vary widely. If you suspect a food allergy or sensitivity, consult a licensed dietitian, allergist, or physician before making dietary changes. Full disclaimer
Some content on this site is AI-assisted. While we strive for accuracy, information may not reflect the latest research. Always verify health information with a professional.
See how Tuna affects you personally.
Try Plateify Free →