Serotonin, the brain chemical linked to mood, plays a key role in regulating emotions such as aggression, according to a study in the journal Science. The chemical's precise role in impulse control has been controversial but this study is one of the first to actually show a causal link. The research also helps explain why some people become combative or aggressive when hungry because the essential amino acid needed for the body to create serotonin is only obtained through diet.
Bonnie - while not exactly ground breaking news, it is nice to see it proven in research. There are numerous mood-boosting foods that I commonly recommend. In addition, I have found magnesium and 5-HTP to be safe serotonin-boosters. Do not "self-medicate" with these supplements, however, especially if on medication. Seek the advice of a licensed health professional.