Raw fish in sushi carries a small but real risk of infection from bacteria, parasites, and mercury exposure, all of which are more dangerous during pregnancy than at any other time in your life. The concern isn’t about sushi itself. It’s about the raw and undercooked fish inside it. Cooked sushi rolls and vegetable rolls are fine to eat while pregnant.
Your Immune System Works Differently During Pregnancy
Pregnancy naturally dials down parts of your immune system so your body doesn’t reject the developing baby. This is normal and necessary, but it makes you significantly more vulnerable to foodborne pathogens. Infections that your body might fight off easily when you’re not pregnant can take hold more readily and cause far more serious consequences.
Your unborn baby’s immune system is still developing, which means it has almost no ability to fight off infections on its own. That’s why the stakes are so much higher: a mild bout of food poisoning for a non-pregnant person can become a medical emergency for a pregnant woman and her baby.
The Listeria Risk
The pathogen that worries health authorities most in this context is Listeria monocytogenes, a bacterium that can contaminate raw fish, soft cheeses, deli meats, and other ready-to-eat foods. What makes Listeria especially dangerous is that you might barely notice you’re sick. The FDA notes that a pregnant woman may have only mild, flu-like symptoms or feel nothing at all, while the infection quietly threatens the pregnancy.
Listeriosis during pregnancy can cause miscarriage, stillbirth, premature delivery, or infant death. Babies who survive a late-term infection may face serious long-term health problems, including seizures, intellectual disability, paralysis, blindness, and impairments of the brain, heart, or kidneys. Cooking fish to an internal temperature of 145°F kills Listeria. Raw fish does not go through that step.
Parasites in Raw Fish
Raw and undercooked fish can harbor parasites, most commonly Anisakis. In a non-pregnant person, these parasites typically cause temporary stomach pain and nausea. During pregnancy, a parasitic infection can lead to anemia and altered immunity, which raises the risk of further maternal infections. The primary effects on the baby include restricted growth in the womb and preterm delivery.
The FDA requires that fish intended to be served raw in the U.S. be flash-frozen first, either at -4°F for seven days or at -31°F until solid and then stored for 15 to 24 hours depending on the method. This process kills parasites effectively. However, compliance varies across restaurants, and these freezing protocols don’t eliminate bacteria like Listeria or Salmonella. So even properly frozen raw fish doesn’t remove all the risks.
Mercury and Fetal Brain Development
Mercury is a separate concern from infection, and it applies to both raw and cooked fish. Certain fish accumulate high levels of methylmercury, a form that crosses the placenta and reaches the developing brain. Prenatal exposure to methylmercury can disrupt how brain cells migrate and organize during fetal development, potentially leading to cognitive deficits that show up years later in childhood.
Several popular sushi fish fall into the higher-mercury category. Bigeye tuna, swordfish, king mackerel, shark, and marlin all carry enough mercury that the FDA advises pregnant women to avoid them entirely, whether raw or cooked. Yellowfin (ahi) tuna is in a middle tier and should be limited.
Lower-mercury fish that commonly appear on sushi menus include salmon, shrimp, squid, scallop, freshwater trout, crab, and flatfish. The FDA considers these “Best Choices,” safe to eat in two to three servings per week when cooked.
Sushi You Can Safely Eat While Pregnant
You don’t have to skip the sushi restaurant entirely. The risk is specifically tied to raw or undercooked seafood, so cooked and vegetable-based rolls are fair game. Some practical options:
- Shrimp tempura rolls, since the shrimp is fully cooked through frying
- Unagi (freshwater eel) rolls, which are always served cooked
- Cooked crab rolls, including California rolls made with imitation crab (which is cooked pollock)
- Vegetable rolls with avocado, cucumber, sweet potato tempura, or pickled radish
- Cooked salmon or shrimp nigiri, if the restaurant offers it
The American Pregnancy Association lists dozens of lower-mercury sushi options that are safe in cooked form, including octopus, clam, scallop, and squid, each fine to enjoy up to two six-ounce servings per week. The key is making sure the seafood has been fully cooked, not just seared on the outside.
What About High-End Sushi Restaurants?
A common follow-up question is whether eating raw fish at a reputable, high-quality restaurant makes it safe enough. Better restaurants do tend to source higher-quality fish and follow FDA freezing guidelines more consistently, which reduces parasite risk. But freezing doesn’t kill bacteria, and no restaurant can guarantee that a piece of raw fish is free from Listeria or other harmful bacteria. The risk is low on any single occasion, but the potential consequences during pregnancy are severe enough that most health authorities recommend avoiding it entirely for those nine months.
In Japan and some other countries, guidelines around raw fish during pregnancy are less strict, partly due to cultural differences in how risk is communicated and partly because of tighter supply-chain standards for raw fish. But the biological vulnerability is the same regardless of where you live: pregnancy suppresses your immune defenses, and your developing baby has almost none.
Getting the Benefits of Fish Without the Risk
Fish is one of the best dietary sources of omega-3 fatty acids, which support your baby’s brain and eye development. Skipping fish entirely during pregnancy means missing out on those benefits. The goal isn’t to avoid fish. It’s to eat it cooked and to choose lower-mercury varieties.
Salmon, sardines, herring, cod, pollock, catfish, and tilapia are all excellent choices that are low in mercury and high in nutrients. Aim for two to three servings per week, cooked to 145°F. That gives your baby the developmental benefits of omega-3s without the infection or mercury risks that come with raw, high-mercury fish.