Fish such as salmon and tuna are an excellent source of Omega 3 Fatty Acids, which are know for their ability to contribute to brain health.
The benefits of eating fish are seen as too great to recommend that we eliminate fish from our diet. However, the advice being widely given is that we limit the amount of certain kinds of fish in order to limit the risk of consuming dangerous amounts of mercury. If you are worried about eating fish, make sure that you get the important Omega 3’s from walnuts and spinach.
Cod liver oil pills do count nutritionally as ‘fish’, but because the liver is a filtration organ and because cod often swim in polluted waters, a fish oil capsule not restricted to the cod’s liver might be better.