Today, a brief introduction to a remarkable person I've had the pleasure of knowing, albeit peripherally, since early 2008: Dr Aristo [Ari] Vojdani - one of the deepest immunologists in the world.
The mothers of every picky eater, unless they exist in complete denial themselves, often intuitively know that their kids suffer a significant stomach, significant gastrointestinal malady - that's biologically based.
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.