A new study published in Nature Food by researchers in the U.K. have found that farmed salmon production causes a loss of six out of nine nutrients—calcium, iodine, iron, omega-3, vitamin B12, and vitamin A. "And it's actually the wild fish that's fed to the salmon that we should be choosing – such as mackerel, anchovies, and herring. These fish contain nutrients highly beneficial to human health, including calcium, omega-3, and B12." Read more about it in Newsweek.