Pregnancy safety
Avoid Swordfish during pregnancy
Swordfish sits on the FDA/EPA "Choices to Avoid" list for pregnancy: it is one of the highest-mercury fish sold, and methylmercury crosses the placenta and can affect fetal brain development.
This is about food safety in pregnancy, not blood sugar — it applies whatever your readings look like. Confirm it with your midwife or doctor.
Allergen Information
Contains: fish
Nutrition per 100g
Swordfish for Gestational Diabetes
Swordfish is a highly prized, predatory marine fish known for its firm, meaty texture and mild, slightly sweet flavor. It is an exceptionally dense protein source that behaves more like a steak than delicate white fish when cooked. From a nutritional standpoint, it delivers high-quality essential amino acids, selenium, vitamin D, and heart-healthy omega-3 fatty acids. However, because it resides at the top of the ocean food chain, it is prone to bioaccumulating heavy metals like mercury. Consequently, while it offers robust nutritional benefits, its consumption must be carefully moderated by specific populations.
At a glance
Pregnancy safety
AvoidBlood sugar impact
lowCarbs / 100 g
0gIs Swordfish safe with gestational diabetes?
Swordfish is an excellent, carbohydrate-free protein source that does not directly elevate blood glucose levels. Its high protein density is highly beneficial for stabilizing overnight glucose readings and managing daytime glycemic patterns. However, the critical concern for gestational diabetes is its high methylmercury content, which can cross the placenta and impact fetal neurological development. Therefore, while it is metabolically highly favorable, it is not a fish to eat during pregnancy at any frequency. Keep it for after the birth, and cover your protein needs with lower-mercury fish such as wild salmon, sardines or trout.
How does Swordfish affect blood sugar during pregnancy?
With a glycemic index of zero, swordfish has no direct impact on postprandial blood sugar levels. The high protein and moderate fat content actively slow down gastric emptying, which prevents rapid glucose absorption from accompanying carbohydrates. Grilling or baking the fish without sugary glazes ensures that its glycemic impact remains completely neutral. This makes it an incredibly powerful tool for flattening the glycemic curve of a mixed meal. It helps maintain stable, predictable insulin demands, which is highly advantageous for managing gestational diabetes.
What is a safe portion of Swordfish for gestational diabetes?
There is no portion of swordfish that is advisable during pregnancy, so this is one to leave off the plate rather than one to weigh. The protein is easy to replace: wild salmon, sardines, trout, tinned light tuna or cooked shrimp give you the same carbohydrate-free protein and the same steady readings without the methylmercury. From any of those, a cooked portion roughly the size of a deck of cards, two or three times a week, comfortably covers your weekly fish intake. Always ensure the fish is cooked thoroughly to an internal temperature of 145 degrees Fahrenheit. If you ate swordfish earlier in the pregnancy, a single meal is not a crisis; leave it out from here and mention it at your next appointment.
How should I combine Swordfish to manage blood sugar during pregnancy?
To maximize glycemic control, pair grilled swordfish with complex, high-fiber carbohydrates and non-starchy vegetables. A highly effective combination is serving a grilled steak alongside a moderate portion of quinoa and roasted asparagus. Alternatively, pair it with a vibrant spinach salad dressed with olive oil and a side of wild rice. The healthy fats in the fish and olive oil work synergistically with the fiber to blunt any potential glucose spikes. Avoid pairing with sweet fruit salsas or heavy starch portions that could overwhelm your insulin response.
Last reviewed: August 31, 2026
Important Safety Information
Every pregnancy is different, and gestational diabetes is managed differently depending on your readings, your medication and how far along you are. The ratings and portions on this page are general information — not a diagnosis, a treatment plan or a medical device — and they cannot see your results.
- Low blood sugar:
- If you take insulin or diabetes medication, eating less carbohydrate than your team planned for can push your blood sugar too low. Treat a reading below 70 mg/dL (3.9 mmol/L), or symptoms such as shaking, sweating, confusion or a racing heart, with fast-acting carbohydrate immediately and retest after 15 minutes. Never use this page as a reason to skip or shrink a meal you were told to eat.
- Carbohydrate and ketones:
- Cutting carbohydrate hard to force a number down is not safe in pregnancy — it can produce ketones. Published guidance sets a minimum of 175 g of carbohydrate per day in pregnancy. Readings that stay above target for several days need your care team, not a smaller portion.
- Medication and insulin:
- The portions here are generic and know nothing about your insulin doses, your metformin, or the steroids given to mature your baby's lungs — all of which change how a meal affects you. Never adjust a dose or a mealtime based on this page.
- Food safety in pregnancy:
- Blood sugar is not the only thing that makes a food suitable while you are pregnant. Some foods with excellent glycemic numbers still carry mercury, vitamin A, listeria or alcohol risks, and those are judged separately from the ratings shown here. Check your national pregnancy food-safety guidance before adding an unfamiliar food.
- What these ratings can and cannot tell you:
- Glycemic index values, impact ratings and maximum servings are population averages taken from published tables. Two people eating the same food can get very different readings, so your own meter is the only measurement that describes you. Nutrition figures are indicative per 100 g and vary with brand, ripeness and preparation.
Contact your care team the same day if: your readings stay above target for several days; you have a reading below 54 mg/dL (3.0 mmol/L) or needed someone else's help to treat a low; you test positive for ketones; or your baby is moving less than usual. Seek emergency care for confusion, fainting, repeated vomiting, or a low you cannot bring back up.
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Sources & Editorial Review
Content independently developed by Dalo Labs ApS, informed by the American Diabetes Association's Standards of Care in Diabetes, ACOG's gestational diabetes guidelines, and the IADPSG consensus criteria. Not endorsed by or affiliated with any referenced organization. · Last reviewed: August 2026
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