There's no reason to leave fish off your plate. You can avoid over-exposing yourself to mercury and other contaminants by eating a variety of seafood. To track the mercury you're getting in a single meal or during a week, visit www.gotmercury.org for a helpful calculator, which uses U.S. Environmental Protection Agency and Federal Food and Drug Administration data. Just plug in your body weight and the types and amounts of fish you eat in a week to see if you are in the safe range.