Neurotransmitter imbalances, like dopamine in the prefrontal cortex, can live downstream from copper challenges. Too much or too little copper can create psychiatric challenges only correctable if identified.
Noteworthy is the fact that minerals involved in cellular production of energy may appear normal in the blood. However, these essential minerals might be significantly deficient or out of balance within the cells or tissues.
If a food constituent can be shown to cause similar changes in the release or the actions of one of these neurotransmitters, there is every reason to expect that the nutrient will also be able to influence behavior.