I wondered what the truth was so I googled "bananas and dopamine".
All seemed to say bananas increase dopamine and are good for PWP.
eg......
"Eat foods known to raise dopamine levels naturally. Bananas are regarded as an exceptional food for dopamine because they contain a chemical closely related to the brain chemical. Ripe bananas have even higher concentrations of this compound. Fresh fruits and vegetables tend to have high dopamine levels in general, as do whole grain foods and legumes."
So carry on enjoying them Samdog!
GG