You have plenty of good reasons to make fish a regular staple in your diet. For starters, it provides a good source of protein without all the saturated fat that you'll find in some meats.

In addition, the omega-3 fatty acids that are found in particularly high levels in certain fish are good for your heart, according to the American Heart Association (AHA).

However, seafood may also contain ingredients that aren't good for you, including mercury. When it's released into the air in pollution, mercury can fall into streams and oceans, where bacteria convert it into another form that then accumulates in fish, with certain species building up more of the stuff than others, according to the Environmental Protection Agency (EPA).

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