"A high fish diet lowers the risk of becoming depressed by around 17 per cent, studies show. For men it is even higher, cutting the likelihood by 20 per cent…
Studies involving more than 150,000 people have suggested the omega 3 fatty acids in fish may alter the production of the brain chemicals dopamine and serotonin, both of which are thought to be involved in depression."
Read more here – http://health.thewest.com.au/news/2256/antidepression-diet-is-highly-fishy