DEAR DOCTOR K: I recently found out that I'm pregnant. I'd like to continue eating fish, but I understand some fish contain mercury, which could be harmful to my baby. What fish should I avoid?
DEAR READER: Fish are a great source of lean protein, and many types are rich in heart-healthy omega-3 fatty acids, which help brain and nerve development and protect the heart. In fact, current dietary guidelines recommend that women who are pregnant eat 12 ounces of seafood a week. But as you noted, some species of fish do contain worrisome amounts of methylmercury. This toxin is especially dangerous to developing brains. High-mercury fish you should avoid during pregnancy include swordfish, shark, king mackerel and tilefish.