>For example, the reason it's unsafe to have sushi twice a week This is misleading. It totally depends on what kind of sushi you have. Tuna rolls are probabl

>For example, the reason it's unsafe to have sushi twice a week This is misleading. It totally depends on what kind of sushi you have. Tuna rolls are probably the most mercury dense and you'd need to eat a lot of them to eat the equivalent of one tuna sandwich. For people not eating shark and swordfish the primary risk is albacore tuna and even then the standard deviation is very high (mostly having to do with where the fish was caught). Basically don't eat tons of "high up in the food chain" seafood while pregnant and nothing bad will happen. From a risk management perspective it's better to make sure you have working smoke detectors in your house and fire extinguishers scattered throughout your property before than to worry about mercury in seafood.