When purchasing canned fish, you must be smart about your buying choices. To buy the healthiest canned seafood, make green choices, pay attention to the packaging, and keep an eye out for mercury and sodium levels. Seafood is a great source of nutrition for your body. However, sometimes it can be harmful to the environment. Always check the label so that you are choosing the most environmentally sustainable option. For example, when choosing canned tuna, the Monterey Bay Aquarium’s Seafood Watch Program suggests purchasing light tuna caught by troll or pole-and-line, which is advertised on many products’ cans. You can also look for the blue Certified Sustainable Seafood label from the Marine Stewardship Council. Purchase seafood that is packaged in BPA-free cans or pouches. BPA is a chemical that is used in the linings of some food and drink cans. Check the labels of your cans to find this information. Always try to purchase fish packed in water. Since water and oil don’t mix, omega-3 fats remain locked in the fish. However, if tuna is packed in oil, then the fish’s natural oils will intermingle with the packing oil. This interaction will cause omega-3s to be lost when the can is drained.