I've heard people say that pregnant women shouldn't eat a lot of fish because of the mercury content. What's so bad about mercury and why is it in fish?
Although fish contain high-quality protein and other essential nutrients, are low in saturated fat, and contain omega-3 fatty acids, nearly all fish and shellfish contain traces of mercury.
Mercury occurs naturally in the environment, and can also be released into the air from pollution. The mercury falls from the air and accumulates in oceans, lakes, and rivers.
