Mayo Clinic Care Network Content
Articles

Pregnancy nutrition: Foods to avoid during pregnancy

Don't eat seafood high in mercury

Seafood can be a great source of protein. And the omega-3 fatty acids in many fish can help your baby's brain and eye development. But some fish and shellfish have levels of mercury that could be harmful. Too much mercury could damage your baby's growing nervous system.

The bigger and older the fish, the more mercury it's likely to contain. The U.S. Food and Drug Administration (FDA) says not to eat the following while pregnant:

  • Bigeye tuna.
  • King mackerel.
  • Marlin.
  • Orange roughy.
  • Swordfish.
  • Shark.
  • Tilefish.

So what's safe? Some types of seafood have little mercury. The Dietary Guidelines for Americans advises pregnant people to eat 8 to 12 ounces (224 to 336 grams) of seafood a week. That's 2 to 3 servings. Here are some options:

  • Anchovies.
  • Black sea bass.
  • Catfish.
  • Cod.
  • Freshwater trout.
  • Herring.
  • Light canned tuna.
  • Oysters.
  • Pollock.
  • Salmon.
  • Sardines.
  • Shad.
  • Shrimp.
  • Sole.
  • Tilapia.
  • Whitefish.