Food with high levels of tryptophan are good for brain

Food with high level of tryptophan  could be linked to improved mood and cognition, possibly due to increased serotonin levels.

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What is Serotonin? What Does Serotonin Do? - page 2 - Medical News Today - http://www.medicalnewstoday.com/articles/232248.php?page=2#natural_ways_to_boost_serotonin_levels