Can I Eat Tuna While Pregnant? Safe Amounts, Mercury Risks, and What Doctors Say
June 12, 2026·17 min read
You are standing in the kitchen, can of tuna in hand, and suddenly you are not sure. You have heard something about mercury and fish during pregnancy, but you cannot remember whether tuna was on the safe list or the avoid list — and the internet, as usual, seems to be offering conflicting answers.
Here is the clear version: yes, you can eat tuna while pregnant — but the type of tuna matters enormously, and the amount matters too. Some tuna is perfectly safe in moderation and genuinely nutritious. Other types carry mercury levels high enough that they should be avoided entirely. Getting that distinction right is what this article is for.
The tuna question is one of the most common pregnancy nutrition questions for a reason. Tuna is one of the most widely eaten fish in the world — it is affordable, convenient, protein-rich, and most people eat it regularly without a second thought. Pregnancy changes that calculus. Not because tuna suddenly becomes dangerous across the board, but because mercury accumulation is a real concern with specific varieties, and the developing fetal brain is more vulnerable to mercury exposure than an adult's is.
This guide covers everything: the mercury science, which types of tuna are safe and which to avoid, how much you can eat each week, how to read labels, whether sushi-grade tuna is different, and a clear reference guide for navigating the tuna aisle and restaurant menus with confidence.
Why Tuna and Mercury Are Connected
Mercury is a naturally occurring heavy metal that enters the ocean through industrial pollution and natural geological processes. Marine microorganisms convert it into methylmercury — the form that accumulates in fish tissue. Through a process called biomagnification, methylmercury concentrations increase at each step up the food chain: small fish absorb it, larger fish eat the small fish and accumulate more, and the largest predatory fish at the top of the chain carry the highest concentrations.
Tuna are large, long-lived, predatory fish. They feed on many smaller fish throughout lives that can span decades, accumulating mercury throughout. This is why tuna carries meaningfully higher mercury levels than short-lived, low-chain species like shrimp or sardines.
When a pregnant woman consumes methylmercury, it crosses the placenta and accumulates in fetal tissue — particularly the developing brain and nervous system, which are vulnerable to mercury toxicity in ways that an adult brain is not. This is the specific concern that shapes the tuna guidance for pregnancy.
The critical nuance — and the reason the answer is not simply "avoid all tuna" — is that mercury content varies dramatically between different species of tuna and different preparations. Light canned tuna and bigeye tuna are not the same food from a mercury perspective. They are not even close.
The Different Types of Tuna: Why They Are Not All Equal
This is the most important section in this entire article, and the reason so many women receive confusing information about tuna in pregnancy. Different tuna species carry radically different mercury levels. The guidance that applies to one does not apply to another.
Canned Light Tuna: Safe in Moderate Amounts
Canned light tuna is made primarily from skipjack tuna — a smaller, shorter-lived species with significantly lower mercury accumulation than larger tunas. It is the most widely sold canned tuna in supermarkets and the one most people use for sandwiches, salads, and pasta dishes.
Average mercury level in canned light tuna: approximately 0.128 parts per million — low enough that the FDA classifies it as a "best choice" for pregnant women and recommends eating it as part of their 2–3 weekly servings of low-mercury seafood.
Canned Albacore (White) Tuna: Safe, But Limited
Canned albacore tuna — sold as "white tuna" — is made from a larger species with higher mercury accumulation than skipjack.
Average mercury level in canned albacore: approximately 0.350 parts per million — more than twice the level of light tuna. The FDA classifies albacore as a "good choice" rather than a "best choice" for pregnant women, recommending it be limited to one serving per week rather than 2–3.
If you regularly eat canned tuna and want to maximise both safety and frequency, canned light tuna is the better choice for pregnancy.
Bigeye Tuna: Avoid During Pregnancy
Bigeye tuna is a large, deep-water species with very high mercury accumulation. It is one of the fish most commonly used in sushi and sashimi, particularly in the high-grade "bluefin-style" preparations at Japanese restaurants.
Average mercury level in bigeye tuna: approximately 0.689 parts per million — among the highest of any commonly eaten fish. The FDA places bigeye tuna on its "avoid" list for pregnant women alongside shark, swordfish, and king mackerel.
This is where the critical distinction lies for women who eat sushi: the tuna in your supermarket sandwich is not the same as the tuna in a high-end sushi restaurant, and the safety guidance is different accordingly.
Bluefin Tuna: Avoid During Pregnancy
Atlantic and Pacific bluefin tuna are prized for sushi and sashimi and are among the most mercury-laden fish in the ocean.
Average mercury level: 0.767–0.852 parts per million — firmly in avoid territory. Bluefin tuna should not be eaten during pregnancy.
Yellowfin Tuna: Limit Carefully
Yellowfin (ahi) tuna falls between albacore and bigeye in mercury content — approximately 0.354 parts per million. It is classified by the FDA as a "good choice" — meaning limited consumption (one serving per week) rather than being avoided entirely, but with more caution than canned light tuna.
Yellowfin is commonly served as ahi tuna steaks, in poke bowls, and as seared tuna in restaurants. It is safe in moderation during pregnancy when fully cooked, but should be limited to one serving per week and avoided raw.
How Much Tuna Can You Eat While Pregnant?
Here is the clear weekly tuna guidance based on FDA and EPA recommendations:
Canned light tuna (skipjack): Up to 2–3 servings per week within your overall 8–12 ounce seafood allowance. This is the most pregnancy-friendly tuna option.
Canned albacore (white) tuna: No more than 1 serving per week (approximately 4 ounces/113g). Do not eat albacore alongside other "good choice" seafood in the same week without staying within the total weekly limit.
Yellowfin/ahi tuna (cooked): No more than 1 serving per week, treated as a "good choice" species.
Bigeye tuna and bluefin tuna: Avoid entirely during pregnancy regardless of preparation method.
A practical note on combining: The weekly limits are cumulative across all seafood, not per species. If you eat a serving of albacore tuna on Tuesday, that is your one weekly "good choice" serving — you would not then also eat yellowfin ahi on Saturday.
Can You Eat Tuna Sushi While Pregnant?
This is one of the most commonly searched sub-questions within the tuna pregnancy topic — and it has two distinct answers depending on what type of tuna the sushi contains.
The Tuna Species Problem at Sushi Restaurants
At many sushi restaurants — particularly higher-end establishments — the "tuna" served is bigeye or bluefin tuna. These are the high-mercury species that should be avoided entirely during pregnancy. This applies regardless of whether the preparation is raw or cooked, because the mercury content is in the fish itself, not affected by cooking.
At more casual sushi restaurants and for sushi sold in supermarkets, the tuna is more likely to be yellowfin (ahi) or a lower-grade skipjack-based product — still worth asking about, but carrying lower mercury risk.
The honest guidance: At a sushi restaurant, if you cannot confirm the species, it is worth asking or erring on the side of caution with tuna specifically. Other cooked sushi options — shrimp (ebi), crab, cooked salmon, vegetable rolls — are safe and do not carry the same ambiguity.
The Raw Fish Problem With All Tuna Sushi
Beyond the mercury question, raw fish in sushi carries the additional risk of bacterial and parasitic contamination during pregnancy. Pregnancy suppresses the immune system, making infections from Listeria, Salmonella, and parasites more serious than they would be otherwise.
Raw tuna sushi and sashimi should be avoided during pregnancy — not only because of mercury in high-risk species, but because the raw preparation itself is a food safety concern regardless of species.
What is safe at a sushi restaurant:
- Cooked shrimp rolls (ebi is typically pre-cooked)
- Tempura rolls (fully cooked)
- California rolls (imitation crab, avocado, cucumber — cooked)
- Cooked salmon rolls (if the salmon is fully cooked through)
- Vegetable rolls
- Edamame, miso soup, gyoza (cooked), and most sides
What to avoid at a sushi restaurant:
- Tuna sashimi or nigiri (raw)
- Spicy tuna rolls (typically made with raw tuna)
- Any raw fish preparation
How to Read Tuna Labels During Pregnancy
The supermarket tuna aisle can be confusing when you are trying to apply the pregnancy guidance. Here is a simple label-reading guide:
"Chunk light" or "light tuna" — this is skipjack tuna. Safe at 2–3 servings per week. The best everyday choice during pregnancy.
"Solid white" or "albacore" — this is albacore tuna. Safe at 1 serving per week maximum.
"White tuna" in a can — this is albacore. Treat as above.
"Chunk white" — albacore. Limit to 1 serving per week.
"Premium" or "gourmet" canned tuna — check the species listed on the label. Premium tinned tunas sometimes use yellowfin rather than skipjack — if so, treat as a "good choice" and limit to 1 serving per week.
Canned tuna labelled as "ahi" — yellowfin tuna. Limit to 1 serving per week.
The clearest, most pregnancy-friendly choice in the supermarket is always canned light tuna (chunk light or light).
Tuna Steaks and Restaurant Tuna: What to Know
Tuna steaks — the kind ordered at a seafood restaurant or purchased raw from the fishmonger — are almost always yellowfin (ahi) or bigeye tuna, not skipjack.
Yellowfin tuna steak (cooked thoroughly): Safe at 1 serving per week maximum.
Bigeye tuna steak: Avoid during pregnancy regardless of cooking method — the mercury concern applies to the fish itself.
Seared tuna (typically ahi/yellowfin): If seared rare or medium-rare, avoid — undercooked fish carries food safety risks during pregnancy. If ordered well-done and fully cooked through, limit to 1 serving per week.
At restaurants, asking your server whether the tuna is yellowfin or bigeye is a reasonable question — reputable restaurants know their ingredients and can confirm.
The Nutritional Benefits of Tuna in Pregnancy
Within the safe types and amounts, tuna is genuinely nutritious and worth including in a pregnancy diet.
Protein: Tuna is one of the leanest, highest-protein foods available — approximately 25–30g of protein per 100g serving. In pregnancy, protein needs increase significantly, and tuna provides a complete, bioavailable protein source with minimal saturated fat.
Omega-3 fatty acids (DHA and EPA): Tuna — particularly albacore — provides meaningful amounts of DHA and EPA, the omega-3 fatty acids critical for fetal brain and eye development. A 100g serving of canned albacore provides approximately 860mg of omega-3s. Canned light tuna provides somewhat less but still contributes to overall intake.
B12: Tuna is an excellent source of vitamin B12, which supports neurological development and red blood cell production. A single serving provides well over 100% of the daily pregnancy requirement.
Selenium: Tuna is rich in selenium — an antioxidant mineral that supports thyroid function and immune health during pregnancy.
Niacin (B3): Important for energy metabolism and fetal skin, nerve, and digestive system development.
Vitamin D: Tuna provides a meaningful amount of vitamin D — a nutrient many pregnant women are deficient in and one of the most important nutrients for bone development and immune function.
The nutritional case for including safe tuna in a pregnancy diet is genuine. The goal is not to eliminate it — it is to choose the right type and respect the weekly limits.
Tuna During Pregnancy: A Quick Reference Summary
| Tuna Type | Mercury Level | Pregnancy Guidance |
|---|---|---|
| Canned light (skipjack) | Very low (~0.128 ppm) | Best choice — up to 2–3 servings/week |
| Canned albacore (white) | Moderate (~0.350 ppm) | Good choice — max 1 serving/week |
| Yellowfin/ahi (cooked) | Moderate (~0.354 ppm) | Good choice — max 1 serving/week |
| Bigeye tuna | High (~0.689 ppm) | Avoid entirely |
| Bluefin tuna | Very high (~0.850 ppm) | Avoid entirely |
| Any raw tuna | Varies | Avoid — food safety risk |
Frequently Asked Questions
Can I eat canned tuna while pregnant?
Yes — canned light tuna (skipjack) is safe at up to 2–3 servings per week within your overall 8–12 ounce seafood allowance. Canned albacore (white) tuna is safe at no more than 1 serving per week. Check the label to confirm which type you have.
How much tuna can I eat per week while pregnant?
Canned light tuna: up to 2–3 servings (up to 12 ounces) per week. Canned albacore or yellowfin: no more than 1 serving (approximately 4 ounces) per week. Bigeye and bluefin tuna should be avoided entirely.
Is canned tuna safe in the first trimester?
Yes — canned light tuna is safe throughout pregnancy including the first trimester, within the weekly limits. The first trimester is actually one of the most critical periods for DHA intake (for brain development), and the omega-3s in tuna contribute to that need. Stick to canned light tuna for the safest, most frequent option.
What type of tuna is in sushi?
Higher-end sushi restaurants typically serve bigeye or bluefin tuna — both of which should be avoided during pregnancy due to high mercury levels. Casual sushi restaurants and supermarket sushi more often use yellowfin or skipjack. Regardless of species, raw tuna in any form should be avoided during pregnancy due to food safety risks. Cooked sushi options are a safer choice at restaurants.
Can I eat a tuna sandwich while pregnant?
Yes — a tuna sandwich made with canned light tuna is safe and a practical, nutritious pregnancy meal. If using canned albacore, limit to one such sandwich per week. A standard tuna sandwich uses approximately 2–3 ounces of tuna — well within safe limits.
Is tuna high in mercury?
It depends on the type. Canned light tuna (skipjack) has very low mercury — approximately 0.128 ppm — comparable to many other safe seafood choices. Canned albacore has moderate mercury. Bigeye and bluefin tuna have high mercury and should be avoided during pregnancy. The word "tuna" covers a wide range of species with dramatically different mercury profiles.
What if I ate tuna sushi before I knew I was pregnant?
Try not to panic. A single exposure carries a probabilistic rather than certain risk. Mercury accumulation is a concern with sustained, regular consumption of high-mercury fish — not from one or two meals. Mention it to your care provider at your next appointment if you are concerned; they can discuss your specific situation and, if appropriate, check mercury levels.
Can tuna cause miscarriage?
There is no evidence that eating canned light tuna in recommended amounts causes miscarriage. The concern with high-mercury fish is primarily fetal neurological development — not miscarriage risk specifically. Eating appropriate types and amounts of tuna during pregnancy is safe.
Conclusion: Choose Wisely, Eat Confidently
The tuna question during pregnancy has a more nuanced answer than a simple yes or no — but once you understand the species distinction, it becomes genuinely straightforward.
Canned light tuna: eat it freely within your weekly seafood limits. It is safe, affordable, protein-rich, and nutritious. A tuna sandwich, a tuna pasta salad, tuna with crackers — these are good pregnancy meals, not sources of concern.
Canned albacore: fine once a week. Choose light tuna when you have the option.
Bigeye and bluefin: avoid. Skip the high-end tuna sashimi and raw tuna in sushi restaurants. There are excellent cooked alternatives.
Pregnancy nutrition is full of genuine complexities. Tuna does not have to be one of them once you know which type you are dealing with. Read the label. Ask the server. Default to light canned tuna for everyday use. And enjoy the protein, the omega-3s, and the B12 that come with making it a regular part of your pregnancy diet.
The right tuna, in the right amount, is one of the most affordable and nutritious choices you can make for yourself and your baby. Know your types — and eat with confidence.
