Why this seafood is bad for you
The Monterey Bay Aquarium Seafood Watch looks at which fish are "fished or farmed in ways that have less impact on the environment." Basically, it's not cool to eat endangered species on land, so maybe don't eat the panda bear of the sea, either.
Then, the good folks at the EWG take the Monterey Bay data and overlay on top of it whether or not it's healthy to consume the selected fish, based on their mercury content. Mercury, according to the EWG/science, negatively effects your heart, nervous system, and general well-being.
Keep in mind that how much you can safely consume varies highly on whether you're a man or woman, your weight, and if you have heart disease, so check the group's handy Seafood Calculator to find out what's right for you. We're going to give you general guidelines, because not all of us are ripped 25-year-olds with 5% body fat. Just those of us who work at Thrillist.