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> I don’t mean from a nutritional standpoint, but a behavioural perspective.

That would normally be called "learning". Also a pretty conventional idea.

With learning, though, you'd want to explain why something becomes immune to further learning at a certain point.

Not necessarily. ADHD is at the neurotransmitter level or density of receptors. Which could be an epigenetic condition from prenatal environment.

Or maybe it’s learnt like you say, I think both areas would be worthy of researching.