I went to a talk yesterday by Prof. John Stein. I was reasonably convinced that it would be a good thing to have a kipper for breakfast several times a week. Rather than trying to summarise the evidence here I recommend that you read the links below. The evidence for all the benefits is not utterly compelling, but I'm fairly convinced that it is worth eating more oily fish, and giving supplements to pregnant women and those thinking of getting pregnant as well as giving them to schoolchildren. It would be nice if school dinners offered mackeral or herring or sardines occasionally.
Guardian article about behaviour effect of omega-3 fatty acids.
Wikipedia has a long article on omega-3 fatty acids. You can read it here.
RSC article discussing health benefits of increasing omega-3 fatty acids
Impact on Heart Disease
George Monbiot on why our fishing policies is making it harder for us to get the right amount of Omega-3 fatty acids
