Is Canned Tuna Safe During Pregnancy?

The short answer: yes, and the can you pick matters most

Canned tuna is safe during pregnancy, but the type decides almost everything. Canned light tuna (usually skipjack) is a low-mercury FDA/EPA Best Choice and fits the normal advice of two to three servings a week. Canned albacore, labeled white tuna, runs roughly three times higher in mercury and is a Good Choice, capped at one 4-ounce serving per week. The practical rule: make light tuna your everyday can and treat albacore as the once-a-week exception.

Why mercury is the concern, not bacteria

Unlike deli meat or fresh fish, shelf-stable canned tuna is commercially cooked and sealed, so listeria and other foodborne germs are not the worry, and the can needs no cooking. The real issue is methylmercury, which builds up through the food chain as larger, longer-lived fish eat smaller ones. Albacore is a bigger, older tuna than skipjack, which is why white cans carry markedly more mercury than light. Methylmercury crosses the placenta and can affect a baby's developing brain and nervous system, which grow throughout all nine months, so the limit is about cumulative intake, not any single meal.

Exactly how much canned tuna is okay

Using the current FDA/EPA chart: canned light tuna counts toward your two to three weekly servings of low-mercury fish, about 8 to 12 ounces total drained across all your Best Choice seafood combined, not on top of it. One serving is roughly 4 ounces, about the size of your palm; most standard cans run about 4 to 5 ounces, with a bit less left after you pour off the liquid, so a single can is in the neighborhood of one serving. Canned albacore (white) tuna is the stricter case: no more than one 4-ounce serving in a week, and in that week count it as your fish rather than adding other seafood on top.

Breastfeeding and the bottom line

Canned tuna stays on the menu while nursing, and the same Best-Choice-versus-Good-Choice split applies, because methylmercury passes into breast milk in small amounts; keep light tuna as your routine pick and hold albacore to about once a week. The one thing that eases up after delivery is that there is no raw-fish or undercooking worry with the canned product, so mercury is the only lever left. Bottom line: make canned light tuna your everyday choice within two to three low-mercury servings a week, cap albacore at one 4-ounce serving weekly, and no cooking is needed since the can is already safe. If you have been eating well above these amounts, especially a lot of albacore, mention it at your next visit. This page is general education, not medical advice; your provider knows your history and is the final word for your pregnancy.