Oily fish are currently recommended as part of a heart healthy diet. This guideline is partially based on the landmark 1970s study that connected the low incidence of coronary artery disease (CAD) among the Inuit of Greenland to their diet, rich in whale and seal blubber. Now, researchers have found that the Inuit people actually suffered from CAD at the same rate as their Caucasian counterparts, meaning there is insufficient evidence to back previous claims on which dietary recommendations were built.

Source: Investigators find something fishy with classical evidence for dietary fish recommendations