As part of a sweeping review of nutrition recommendations, the Dietary Guidelines Advisory Committee recently reiterated the current seafood guidelines: Americans should eat a wide variety of seafood. The report also acknowledges the risk of mercury exposure from certain kinds of seafoods, and notes that women who are pregnant, nursing or may become pregnant should avoid certain kinds — tilefish, shark, swordfish and king mackerel — because of their high mercury content.
The panel withheld a recommendation about tuna, second only to shrimp in popularity in the United States. Current guidelines from the Food and Drug Administration and the Environmental Protection Agency warn pregnant and nursing women to limit tuna consumption to six ounces per week.
From reading the article, it does seem like a promotion for tuna/seafood. Flaxseeds and walnuts are a far better source, and have a better shelf life. Iodine? That’s what in common table salt, for sake of the fact that most diets are iodine deficient. Vitamin B12 is the most difficult to source of the B vitamins, depending on your diet (IE vegan).